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312 Area CodeChicago, IL

Area code 312 covers Chicago, Illinois: 348,013 people in Cook County, on Central Time (CT). It overlays 872.

Overview

Major City
Chicago
State
Illinois (IL)
Timezone
Central Time (CT)
Current Time
–:––
Overlay
Yes – shares area with 872

Nearby Area Codes

Where is area code 312?

Overview of the 312 Area Code

Geographic Coverage of the 312 Area Code

Chicago Area Codes Overview

What cities does area code 312 cover?

CityStatePopulationPopulation in 312% of listed-city population% of City
ChicagoIL2,721,308344,436100.0%12.7%

City population is shown in full; each city's share inside 312 is measured from Census tract centroids.

What counties does area code 312 cover?

CountyStatePopulation in 312% of area-code footprint% of County
Cook CountyIL348,013100%7%
Sources:

Has area code 312 been reported for unwanted calls?

Yes – 1,570 FTC complaints, May 29 – Oct 1, 2026.

  • 51% robocalls
  • ↑ 11% vs prior period
  • FTC data, retrieved 2026-10-05

Most-reported subjects

  • Other48%759
  • Dropped call or no message14%225
  • Calls pretending to be government, businesses, or family and friends10%164

Caller ID is easily spoofed, so these figures reflect the number shown on caller ID, not the caller's true location – an area code alone never identifies a caller. The FTC does not verify the facts in these complaints.

Which prefixes and exchanges belong to area code 312?

78% assigned to a telco

  • 70% Landline
  • 30% Wireless
  • 0% Unknown
PrefixUsageCarrier
(312)200-LandlineMetropcs
(312)201-LandlineIllinois Bell Tel Co
(312)202-LandlineIllinois Bell Tel Co
(312)203-WirelessNew Cingular Wireless Pcs
(312)204-LandlineIllinois Bell Tel Co
(312)205-LandlineMcimetro Access Transmission Services
(312)206-WirelessNew Cingular Wireless Pcs
(312)207-LandlineIllinois Bell Tel Co
(312)208-WirelessNew Cingular Wireless Pcs
(312)209-WirelessVerizon Wireless
(312)210-LandlinePeerless Network Of Illinois
(312)212-LandlineIllinois Bell Tel Co
(312)213-WirelessNew Cingular Wireless Pcs
(312)214-LandlineIllinois Bell Tel Co
(312)215-WirelessNew Cingular Wireless Pcs
(312)216-LandlineFirst Communications
(312)217-WirelessSprint Spectrum
(312)218-WirelessNew Cingular Wireless Pcs
(312)219-LandlineBandwidth.Com Clec
(312)220-LandlineIllinois Bell Tel Co
(312)221-WirelessSprint Spectrum
(312)222-LandlineIllinois Bell Tel Co
(312)223-LandlineIllinois Bell Tel Co
(312)224-LandlineLevel 3 Communications
(312)225-LandlineIllinois Bell Tel Co
(312)226-LandlineIllinois Bell Tel Co
(312)227-LandlineIllinois Bell Tel Co
(312)228-LandlineIllinois Bell Tel Co
(312)229-LandlineIllinois Bell Tel Co
(312)230-LandlineIllinois Bell Tel Co
(312)231-WirelessNew Cingular Wireless Pcs
(312)232-LandlineAmerican Messaging Services
(312)233-LandlineIllinois Bell Tel Co
(312)234-LandlineIllinois Bell Tel Co
(312)235-LandlineIllinois Bell Tel Co
(312)236-LandlineIllinois Bell Tel Co
(312)237-WirelessVerizon Wireless
(312)238-LandlineLevel 3 Communications
(312)239-LandlineAt&T
(312)240-LandlineIllinois Bell Tel Co
(312)241-WirelessNew Cingular Wireless Pcs
(312)242-LandlineTeleport Communications America
(312)243-LandlineIllinois Bell Tel Co
(312)244-LandlineIllinois Bell Tel Co
(312)245-LandlineIllinois Bell Tel Co
(312)246-WirelessNew Cingular Wireless Pcs
(312)247-LandlineFirst Communications
(312)248-LandlineMetropcs
(312)249-WirelessUsa Mobility Wireless
(312)250-WirelessUsa Mobility Wireless
(312)251-LandlineIllinois Bell Tel Co
(312)252-LandlineMcimetro Access Transmission Services
(312)253-LandlineMcimetro Access Transmission Services
(312)254-LandlineMcimetro Access Transmission Services
(312)255-LandlineIllinois Bell Tel Co
(312)256-LandlineMcimetro Access Transmission Services
(312)257-WirelessVerizon Wireless
(312)258-LandlineIllinois Bell Tel Co
(312)259-WirelessNew Cingular Wireless Pcs
(312)260-LandlineMcimetro Access Transmission Services
(312)261-LandlineLevel 3 Communications
(312)262-LandlineMcimetro Access Transmission Services
(312)263-LandlineIllinois Bell Tel Co
(312)264-LandlineLevel 3 Communications
(312)265-LandlineAccess One
(312)266-LandlineIllinois Bell Tel Co
(312)267-LandlineIllinois Bell Tel Co
(312)268-LandlineLevel 3 Communications
(312)269-LandlineIllinois Bell Tel Co
(312)270-LandlineMetropcs
(312)271-WirelessUsa Mobility Wireless
(312)272-WirelessUsa Mobility Wireless
(312)273-WirelessVerizon Wireless
(312)274-LandlineIllinois Bell Tel Co
(312)275-LandlineMcimetro Access Transmission Services
(312)276-LandlineMcimetro Access Transmission Services
(312)277-LandlineMcimetro Access Transmission Services
(312)278-LandlineLevel 3 Communications
(312)279-LandlineMcimetro Access Transmission Services
(312)280-LandlineIllinois Bell Tel Co
(312)281-LandlineGlobal Crossing Local Services
(312)282-WirelessNew Cingular Wireless Pcs
(312)283-LandlineGlobal Crossing Local Services
(312)284-LandlineXo Illinois
(312)285-WirelessSprint Spectrum
(312)286-WirelessNew Cingular Wireless Pcs
(312)287-WirelessSprint Spectrum
(312)288-LandlineMcimetro Access Transmission Services
(312)289-WirelessUsa Mobility Wireless
(312)290-WirelessUsa Mobility Wireless
(312)291-LandlineIllinois Bell Tel Co
(312)292-LandlineBandwidth.Com Clec
(312)293-LandlineIllinois Bell Tel Co
(312)294-LandlineIllinois Bell Tel Co
(312)295-WirelessUsa Mobility Wireless
(312)296-WirelessSprint Spectrum
(312)297-LandlineIllinois Bell Tel Co
(312)298-LandlineRcn Telecom Services Of Illinios
(312)299-WirelessUsa Mobility Wireless
(312)300-LandlineLevel 3 Communications
(312)301-WirelessNew Cingular Wireless Pcs
(312)302-LandlineIllinois Bell Tel Co
(312)303-WirelessNew Cingular Wireless Pcs
(312)304-WirelessNew Cingular Wireless Pcs
(312)305-WirelessVerizon Wireless
(312)306-LandlineIllinois Bell Tel Co
(312)307-WirelessNew Cingular Wireless Pcs
(312)308-LandlineIllinois Bell Tel Co
(312)309-LandlineIllinois Bell Tel Co
(312)310-WirelessVerizon Wireless
(312)312-LandlineOnvoy
(312)313-LandlineOnvoy
(312)314-WirelessNew Cingular Wireless Pcs
(312)315-WirelessNew Cingular Wireless Pcs
(312)316-WirelessNew Cingular Wireless Pcs
(312)317-WirelessNew Cingular Wireless Pcs
(312)318-WirelessVerizon Wireless
(312)319-LandlineMcimetro Access Transmission Services
(312)320-WirelessNew Cingular Wireless Pcs
(312)321-LandlineIllinois Bell Tel Co
(312)322-LandlineIllinois Bell Tel Co
(312)323-LandlineAmerican Messaging Services
(312)324-LandlineLevel 3 Communications
(312)325-LandlineIllinois Bell Tel Co
(312)326-LandlineIllinois Bell Tel Co
(312)327-LandlineXo Illinois
(312)328-LandlineIllinois Bell Tel Co
(312)329-LandlineIllinois Bell Tel Co
(312)330-WirelessNew Cingular Wireless Pcs
(312)331-WirelessNew Cingular Wireless Pcs
(312)332-LandlineIllinois Bell Tel Co
(312)333-LandlineAmerican Messaging Services
(312)334-LandlineFirst Communications
(312)335-LandlineIllinois Bell Tel Co
(312)336-LandlineIllinois Bell Tel Co
(312)337-LandlineIllinois Bell Tel Co
(312)338-LandlineIllinois Bell Tel Co
(312)339-WirelessVerizon Wireless
(312)340-WirelessT-Mobile Usa
(312)341-LandlineIllinois Bell Tel Co
(312)342-WirelessNew Cingular Wireless Pcs
(312)343-WirelessVerizon Wireless
(312)344-LandlineIllinois Bell Tel Co
(312)345-LandlineIllinois Bell Tel Co
(312)346-LandlineIllinois Bell Tel Co
(312)347-LandlineIllinois Bell Tel Co
(312)348-LandlineOnvoy
(312)349-WirelessUsa Mobility Wireless
(312)350-WirelessVerizon Wireless
(312)351-WirelessNew Cingular Wireless Pcs
(312)352-WirelessNew Cingular Wireless Pcs
(312)353-LandlineIllinois Bell Tel Co
(312)354-WirelessNew Cingular Wireless Pcs
(312)355-LandlineIllinois Bell Tel Co
(312)356-LandlineIllinois Bell Tel Co
(312)357-LandlineIllinois Bell Tel Co
(312)358-WirelessT-Mobile Usa
(312)359-WirelessUsa Mobility Wireless
(312)360-LandlineIllinois Bell Tel Co
(312)361-LandlineIllinois Bell Tel Co
(312)362-LandlineIllinois Bell Tel Co
(312)363-LandlineRcn Telecom Services Of Illinios
(312)364-LandlineIllinois Bell Tel Co
(312)365-WirelessUsa Mobility Wireless
(312)366-WirelessNew Cingular Wireless Pcs
(312)367-WirelessUsa Mobility Wireless
(312)368-LandlineIllinois Bell Tel Co
(312)369-WirelessNew Cingular Wireless Pcs
(312)370-WirelessUsa Mobility Wireless
(312)371-WirelessSprint Spectrum
(312)372-LandlineIllinois Bell Tel Co
(312)373-LandlineLevel 3 Communications
(312)374-LandlineIllinois Bell Tel Co
(312)375-WirelessT-Mobile Usa
(312)376-LandlineOnvoy
(312)377-LandlineXo Illinois
(312)378-WirelessUsa Mobility Wireless
(312)379-LandlineOvation Communications Of Illinois
(312)380-LandlineIllinois Bell Tel Co
(312)381-LandlineIllinois Bell Tel Co
(312)382-LandlineIllinois Bell Tel Co
(312)383-LandlineTeleport Communications America
(312)384-LandlineIllinois Bell Tel Co
(312)385-LandlineIllinois Bell Tel Co
(312)386-LandlineIllinois Bell Tel Co
(312)387-WirelessUsa Mobility Wireless
(312)388-WirelessSprint Spectrum
(312)389-WirelessUsa Mobility Wireless
(312)390-LandlineAmerican Messaging Services
(312)391-WirelessNew Cingular Wireless Pcs
(312)392-LandlineOnvoy
(312)393-LandlineAmerican Messaging Services
(312)394-LandlineIllinois Bell Tel Co
(312)395-LandlineAt&T
(312)396-LandlineIllinois Bell Tel Co
(312)397-LandlineIllinois Bell Tel Co
(312)398-WirelessUsa Mobility Wireless
(312)399-WirelessSprint Spectrum
(312)400-LandlineAmerican Messaging Services
(312)401-WirelessNew Cingular Wireless Pcs
(312)402-WirelessNew Cingular Wireless Pcs
(312)403-WirelessVerizon Wireless
(312)404-WirelessT-Mobile Usa
(312)405-WirelessVerizon Wireless
(312)406-WirelessNew Cingular Wireless Pcs
(312)407-LandlineIllinois Bell Tel Co
(312)408-LandlineIllinois Bell Tel Co
(312)409-LandlineIllinois Bell Tel Co
(312)410-LandlineIllinois Bell Tel Co
(312)412-WirelessNew Cingular Wireless Pcs
(312)413-LandlineIllinois Bell Tel Co
(312)414-LandlineVonage America
(312)415-WirelessVerizon Wireless
(312)416-LandlineMcimetro Access Transmission Services
(312)417-LandlineIllinois Bell Tel Co
(312)418-WirelessUsa Mobility Wireless
(312)419-LandlineIllinois Bell Tel Co
(312)420-WirelessNew Cingular Wireless Pcs
(312)421-LandlineIllinois Bell Tel Co
(312)422-LandlineIllinois Bell Tel Co
(312)423-LandlineLevel 3 Communications
(312)424-LandlineIllinois Bell Tel Co
(312)425-LandlineIllinois Bell Tel Co
(312)426-WirelessUsa Mobility Wireless
(312)427-LandlineIllinois Bell Tel Co
(312)428-LandlineLevel 3 Communications
(312)429-LandlineGlobal Crossing Local Services
(312)430-LandlineIllinois Bell Tel Co
(312)431-LandlineIllinois Bell Tel Co
(312)432-LandlineIllinois Bell Tel Co
(312)433-LandlineIllinois Bell Tel Co
(312)434-WirelessSprint Spectrum
(312)435-LandlineIllinois Bell Tel Co
(312)436-LandlineIllinois Bell Tel Co
(312)437-WirelessSprint Spectrum
(312)438-WirelessVerizon Wireless
(312)439-WirelessNew Cingular Wireless Pcs
(312)440-LandlineIllinois Bell Tel Co
(312)441-LandlineIllinois Bell Tel Co
(312)442-LandlineIllinois Bell Tel Co
(312)443-LandlineIllinois Bell Tel Co
(312)444-LandlineIllinois Bell Tel Co
(312)445-LandlineIllinois Bell Tel Co
(312)446-WirelessSprint Spectrum
(312)447-LandlineIllinois Bell Tel Co
(312)448-WirelessVerizon Wireless
(312)449-LandlineAmerican Messaging Services
(312)450-WirelessNew Cingular Wireless Pcs
(312)451-WirelessT-Mobile Usa
(312)452-LandlineAmerican Messaging Services
(312)453-LandlineMcimetro Access Transmission Services
(312)454-LandlineIllinois Bell Tel Co
(312)455-LandlineIllinois Bell Tel Co
(312)456-LandlineIllinois Bell Tel Co
(312)457-LandlineAmerican Messaging Services
(312)458-LandlineIllinois Bell Tel Co
(312)459-WirelessT-Mobile Usa
(312)460-LandlineIllinois Bell Tel Co
(312)461-LandlineIllinois Bell Tel Co
(312)462-LandlineIllinois Bell Tel Co
(312)463-LandlineIllinois Bell Tel Co
(312)464-LandlineIllinois Bell Tel Co
(312)465-LandlineChoice One Comm Il
(312)466-LandlineIllinois Bell Tel Co
(312)467-LandlineIllinois Bell Tel Co
(312)468-WirelessT-Mobile Usa
(312)469-LandlineIllinois Bell Tel Co
(312)470-LandlineMcimetro Access Transmission Services
(312)471-LandlineMcimetro Access Transmission Services
(312)472-LandlineIllinois Bell Tel Co
(312)473-LandlineYmax Communications
(312)474-LandlineIllinois Bell Tel Co
(312)475-LandlineIllinois Bell Tel Co
(312)476-WirelessSprint Spectrum
(312)477-LandlineLevel 3 Communications
(312)478-WirelessT-Mobile Usa
(312)479-LandlineAt&T
(312)480-WirelessNew Cingular Wireless Pcs
(312)481-LandlineMetropcs
(312)482-LandlineIllinois Bell Tel Co
(312)483-WirelessT-Mobile Usa
(312)484-WirelessUsa Mobility Wireless
(312)485-WirelessVerizon Wireless
(312)486-LandlineMcimetro Access Transmission Services
(312)487-LandlineMetropcs
(312)488-LandlineLevel 3 Communications
(312)489-WirelessVerizon Wireless
(312)490-WirelessUsa Mobility Wireless
(312)491-LandlineIllinois Bell Tel Co
(312)492-LandlineIllinois Bell Tel Co
(312)493-WirelessT-Mobile Usa
(312)494-LandlineIllinois Bell Tel Co
(312)495-WirelessUsa Mobility Wireless
(312)496-LandlineIllinois Bell Tel Co
(312)497-WirelessVerizon Wireless
(312)498-WirelessSprint Spectrum
(312)499-LandlineIllinois Bell Tel Co
(312)500-LandlineOnvoy
(312)501-WirelessVerizon Wireless
(312)502-WirelessVerizon Wireless
(312)503-LandlineTeleport Communications America
(312)504-WirelessNew Cingular Wireless Pcs
(312)505-WirelessVerizon Wireless
(312)506-LandlineFirst Communications
(312)507-LandlineIllinois Bell Tel Co
(312)508-LandlinePeerless Network Of Illinois
(312)509-LandlinePeerless Network Of Illinois
(312)510-WirelessNew Cingular Wireless Pcs
(312)512-WirelessUsa Mobility Wireless
(312)513-WirelessNew Cingular Wireless Pcs
(312)514-LandlineAmerican Messaging Services
(312)515-WirelessVerizon Wireless
(312)516-LandlineIllinois Bell Tel Co
(312)517-LandlineMcimetro Access Transmission Services
(312)518-WirelessNew Cingular Wireless Pcs
(312)519-WirelessVerizon Wireless
(312)520-WirelessVerizon Wireless
(312)521-LandlineAt&T
(312)522-WirelessT-Mobile Usa
(312)523-WirelessSprint Spectrum
(312)524-WirelessNew Cingular Wireless Pcs
(312)525-LandlineMcimetro Access Transmission Services
(312)526-LandlineIllinois Bell Tel Co
(312)527-LandlineIllinois Bell Tel Co
(312)528-LandlineIllinois Bell Tel Co
(312)529-LandlineAt&T
(312)530-LandlineStratus Networks
(312)531-WirelessNew Cingular Wireless Pcs
(312)532-WirelessT-Mobile Usa
(312)533-WirelessVerizon Wireless
(312)534-LandlineIllinois Bell Tel Co
(312)535-LandlineBandwidth.Com Clec
(312)536-WirelessT-Mobile Usa
(312)537-LandlineIllinois Bell Tel Co
(312)538-LandlineMetropcs
(312)539-WirelessT-Mobile Usa
(312)540-LandlineIllinois Bell Tel Co
(312)541-LandlineIllinois Bell Tel Co
(312)542-LandlineIllinois Bell Tel Co
(312)543-WirelessNew Cingular Wireless Pcs
(312)544-LandlineIllinois Bell Tel Co
(312)545-WirelessSprint Spectrum
(312)546-LandlineLevel 3 Communications
(312)547-WirelessNew Cingular Wireless Pcs
(312)548-LandlineLevel 3 Communications
(312)549-LandlineTeleport Communications America
(312)550-WirelessVerizon Wireless
(312)551-LandlineIllinois Bell Tel Co
(312)552-LandlineIllinois Bell Tel Co
(312)553-LandlineIllinois Bell Tel Co
(312)554-LandlineIllinois Bell Tel Co
(312)556-LandlineIllinois Bell Tel Co
(312)557-LandlineIllinois Bell Tel Co
(312)558-LandlineIllinois Bell Tel Co
(312)559-LandlineIllinois Bell Tel Co
(312)560-WirelessNew Cingular Wireless Pcs
(312)561-WirelessVerizon Wireless
(312)562-WirelessUsa Mobility Wireless
(312)563-LandlineIllinois Bell Tel Co
(312)564-LandlineFirst Communications
(312)565-LandlineIllinois Bell Tel Co
(312)566-LandlineIllinois Bell Tel Co
(312)567-LandlineIllinois Bell Tel Co
(312)568-LandlineIllinois Bell Tel Co
(312)569-LandlineIllinois Bell Tel Co
(312)570-LandlineIllinois Bell Tel Co
(312)571-WirelessUsa Mobility Wireless
(312)572-LandlineIllinois Bell Tel Co
(312)573-LandlineIllinois Bell Tel Co
(312)574-LandlineIllinois Bell Tel Co
(312)575-LandlineIllinois Bell Tel Co
(312)576-WirelessNew Cingular Wireless Pcs
(312)577-LandlineMcimetro Access Transmission Services
(312)578-LandlineIllinois Bell Tel Co
(312)579-WirelessVerizon Wireless
(312)580-LandlineIllinois Bell Tel Co
(312)581-WirelessNew Cingular Wireless Pcs
(312)582-LandlineIllinois Bell Tel Co
(312)583-LandlineIllinois Bell Tel Co
(312)584-LandlineVoip Innovations
(312)585-LandlineMcimetro Access Transmission Services
(312)586-LandlineOnvoy
(312)587-LandlineIllinois Bell Tel Co
(312)588-LandlineIllinois Bell Tel Co
(312)589-LandlineIllinois Bell Tel Co
(312)590-WirelessVerizon Wireless
(312)591-LandlineIllinois Bell Tel Co
(312)592-LandlineIllinois Bell Tel Co
(312)593-WirelessT-Mobile Usa
(312)594-LandlineMcimetro Access Transmission Services
(312)595-LandlineIllinois Bell Tel Co
(312)596-LandlineTeleport Communications America
(312)597-WirelessVerizon Wireless
(312)598-LandlineOnvoy
(312)599-WirelessVerizon Wireless
(312)600-LandlineOnvoy
(312)601-LandlineMcimetro Access Transmission Services
(312)602-LandlineLevel 3 Communications
(312)603-LandlineIllinois Bell Tel Co
(312)604-LandlineXo Illinois
(312)605-LandlineOvation Communications Of Illinois
(312)606-LandlineIllinois Bell Tel Co
(312)607-WirelessNew Cingular Wireless Pcs
(312)608-WirelessNew Cingular Wireless Pcs
(312)609-LandlineIllinois Bell Tel Co
(312)610-WirelessVerizon Wireless
(312)612-LandlineIllinois Bell Tel Co
(312)613-WirelessNew Cingular Wireless Pcs
(312)614-LandlineIllinois Bell Tel Co
(312)615-WirelessNew Cingular Wireless Pcs
(312)616-LandlineIllinois Bell Tel Co
(312)617-WirelessSprint Spectrum
(312)618-WirelessNew Cingular Wireless Pcs
(312)619-WirelessT-Mobile Usa
(312)620-LandlineBandwidth.Com Clec
(312)621-LandlineIllinois Bell Tel Co
(312)622-WirelessNew Cingular Wireless Pcs
(312)623-WirelessNew Cingular Wireless Pcs
(312)624-LandlineRcn Telecom Services Of Illinios
(312)625-LandlineLevel 3 Communications
(312)626-LandlineOnvoy
(312)627-LandlineIllinois Bell Tel Co
(312)628-LandlineXo Illinois
(312)629-LandlineIllinois Bell Tel Co
(312)630-LandlineIllinois Bell Tel Co
(312)631-LandlineCenturylink Communications
(312)632-LandlineIllinois Bell Tel Co
(312)633-LandlineIllinois Bell Tel Co
(312)634-LandlineIllinois Bell Tel Co
(312)635-LandlineGlobal Crossing Local Services
(312)636-WirelessVerizon Wireless
(312)637-LandlineLevel 3 Communications
(312)638-LandlineLevel 3 Communications
(312)639-WirelessVerizon Wireless
(312)640-LandlineIllinois Bell Tel Co
(312)641-LandlineIllinois Bell Tel Co
(312)642-LandlineIllinois Bell Tel Co
(312)643-LandlineRcn Telecom Services Of Illinios
(312)644-LandlineIllinois Bell Tel Co
(312)645-LandlineIllinois Bell Tel Co
(312)646-LandlineLevel 3 Communications
(312)647-WirelessT-Mobile Usa
(312)648-LandlineIllinois Bell Tel Co
(312)649-LandlineIllinois Bell Tel Co
(312)650-LandlineRcn Telecom Services Of Illinios
(312)651-LandlineIllinois Bell Tel Co
(312)652-LandlineIllinois Bell Tel Co
(312)653-LandlineIllinois Bell Tel Co
(312)654-LandlineIllinois Bell Tel Co
(312)655-LandlineIllinois Bell Tel Co
(312)656-WirelessSprint Spectrum
(312)657-WirelessUsa Mobility Wireless
(312)658-LandlineIllinois Bell Tel Co
(312)659-WirelessNew Cingular Wireless Pcs
(312)660-LandlineTeleport Communications America
(312)661-LandlineIllinois Bell Tel Co
(312)662-LandlineIllinois Bell Tel Co
(312)663-LandlineIllinois Bell Tel Co
(312)664-LandlineIllinois Bell Tel Co
(312)665-LandlineTeleport Communications America
(312)666-LandlineIllinois Bell Tel Co
(312)667-LandlinePeerless Network Of Illinois
(312)668-WirelessCsc Wireless
(312)669-LandlineIllinois Bell Tel Co
(312)670-LandlineIllinois Bell Tel Co
(312)671-WirelessSprint Spectrum
(312)672-LandlineIllinois Bell Tel Co
(312)673-LandlineFirst Communications
(312)674-LandlineIllinois Bell Tel Co
(312)675-LandlineIllinois Bell Tel Co
(312)676-LandlineFirst Communications
(312)677-WirelessUsa Mobility Wireless
(312)678-WirelessT-Mobile Usa
(312)679-LandlineAmerican Messaging Services
(312)680-LandlineOnvoy
(312)681-LandlineIllinois Bell Tel Co
(312)682-LandlineNuso
(312)683-LandlineIllinois Bell Tel Co
(312)684-WirelessT-Mobile Usa
(312)685-WirelessSprint Spectrum
(312)686-LandlinePeerless Network Of Illinois
(312)687-WirelessT-Mobile Usa
(312)688-WirelessUsa Mobility Wireless
(312)689-LandlineAmerican Messaging Services
(312)690-LandlineRclec
(312)691-WirelessIndiana Paging Network
(312)692-LandlineIllinois Bell Tel Co
(312)693-LandlineIllinois Bell Tel Co
(312)694-LandlineIllinois Bell Tel Co
(312)695-LandlineIllinois Bell Tel Co
(312)696-LandlineIllinois Bell Tel Co
(312)697-LandlineIllinois Bell Tel Co
(312)698-LandlineLevel 3 Communications
(312)699-WirelessNew Cingular Wireless Pcs
(312)701-LandlineIllinois Bell Tel Co
(312)702-LandlineMcimetro Access Transmission Services
(312)703-LandlineIllinois Bell Tel Co
(312)704-LandlineIllinois Bell Tel Co
(312)705-LandlineTeleport Communications America
(312)706-LandlineTeleport Communications America
(312)707-LandlineIllinois Bell Tel Co
(312)709-WirelessT-Mobile Usa
(312)710-LandlineIllinois Bell Tel Co
(312)712-LandlineIllinois Bell Tel Co
(312)713-LandlineAmerican Messaging Services
(312)714-LandlineIllinois Bell Tel Co
(312)715-LandlineIllinois Bell Tel Co
(312)716-LandlineIllinois Bell Tel Co
(312)717-WirelessUsa Mobility Wireless
(312)718-WirelessVerizon Wireless
(312)719-WirelessSprint Spectrum
(312)720-WirelessVerizon Wireless
(312)721-WirelessT-Mobile Usa
(312)722-LandlineChoice One Comm Il
(312)723-WirelessNew Cingular Wireless Pcs
(312)724-LandlineBandwidth.Com Clec
(312)725-LandlineBandwidth.Com Clec
(312)726-LandlineIllinois Bell Tel Co
(312)727-LandlineIllinois Bell Tel Co
(312)728-WirelessVerizon Wireless
(312)729-LandlineIllinois Bell Tel Co
(312)730-LandlineAt&T
(312)731-WirelessT-Mobile Usa
(312)732-LandlineIllinois Bell Tel Co
(312)733-LandlineIllinois Bell Tel Co
(312)734-LandlineTeleport Communications America
(312)735-WirelessSprint Spectrum
(312)736-LandlineTeleport Communications America
(312)737-LandlineIllinois Bell Tel Co
(312)738-LandlineIllinois Bell Tel Co
(312)739-LandlineIllinois Bell Tel Co
(312)740-LandlineAmerican Messaging Services
(312)741-LandlineOvation Communications Of Illinois
(312)742-LandlineIllinois Bell Tel Co
(312)743-LandlineIllinois Bell Tel Co
(312)744-LandlineIllinois Bell Tel Co
(312)745-LandlineIllinois Bell Tel Co
(312)746-LandlineIllinois Bell Tel Co
(312)747-LandlineIllinois Bell Tel Co
(312)749-WirelessNew Cingular Wireless Pcs
(312)750-LandlineIllinois Bell Tel Co
(312)751-LandlineIllinois Bell Tel Co
(312)752-LandlineLevel 3 Communications
(312)753-LandlineRcn Telecom Services Of Illinios
(312)754-LandlineLevel 3 Telecom Of Illinois
(312)755-LandlineIllinois Bell Tel Co
(312)756-LandlineIllinois Bell Tel Co
(312)757-LandlineGetgo Communications
(312)758-WirelessVerizon Wireless
(312)759-LandlineIllinois Bell Tel Co
(312)760-LandlineAmerican Messaging Services
(312)761-LandlineTelengy
(312)762-LandlineIllinois Bell Tel Co
(312)763-LandlineComcast Ip Phone
(312)764-LandlineTeleport Communications America
(312)765-LandlineIllinois Bell Tel Co
(312)766-LandlinePeerless Network Of Illinois
(312)767-LandlineBandwidth.Com Clec
(312)768-LandlineAt&T
(312)769-WirelessIndiana Paging Network
(312)770-LandlineIllinois Bell Tel Co
(312)771-WirelessVerizon Wireless
(312)772-WirelessNew Cingular Wireless Pcs
(312)774-WirelessT-Mobile Usa
(312)775-LandlineIllinois Bell Tel Co
(312)776-WirelessT-Mobile Usa
(312)777-LandlineTeleport Communications America
(312)778-LandlineOnvoy
(312)779-LandlineOnvoy
(312)780-LandlineMcimetro Access Transmission Services
(312)781-LandlineIllinois Bell Tel Co
(312)782-LandlineIllinois Bell Tel Co
(312)783-WirelessNew Cingular Wireless Pcs
(312)784-LandlineFirst Communications
(312)785-WirelessNew Cingular Wireless Pcs
(312)786-LandlineIllinois Bell Tel Co
(312)787-LandlineIllinois Bell Tel Co
(312)788-LandlineIllinois Bell Tel Co
(312)789-LandlineIllinois Bell Tel Co
(312)790-LandlineIllinois Bell Tel Co
(312)791-LandlineIllinois Bell Tel Co
(312)792-LandlineMcimetro Access Transmission Services
(312)793-LandlineIllinois Bell Tel Co
(312)794-LandlineRcn Telecom Services Of Illinios
(312)795-LandlineIllinois Bell Tel Co
(312)796-LandlinePeerless Network Of Illinois
(312)797-LandlineIllinois Bell Tel Co
(312)798-LandlineIllinois Bell Tel Co
(312)799-LandlineIllinois Bell Tel Co
(312)800-LandlinePeerless Network Of Illinois
(312)801-LandlineNuso
(312)802-WirelessVerizon Wireless
(312)803-LandlineMcimetro Access Transmission Services
(312)804-WirelessT-Mobile Usa
(312)805-WirelessVerizon Wireless
(312)806-WirelessNew Cingular Wireless Pcs
(312)807-LandlineIllinois Bell Tel Co
(312)808-LandlineIllinois Bell Tel Co
(312)809-LandlineMcimetro Access Transmission Services
(312)810-WirelessNew Cingular Wireless Pcs
(312)812-LandlineIllinois Bell Tel Co
(312)813-WirelessNew Cingular Wireless Pcs
(312)814-LandlineIllinois Bell Tel Co
(312)815-LandlineAirespring
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(312)817-LandlineIllinois Bell Tel Co
(312)818-WirelessT-Mobile Usa
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(312)820-LandlineOnvoy
(312)821-LandlineMcimetro Access Transmission Services
(312)822-LandlineIllinois Bell Tel Co
(312)823-LandlineIllinois Bell Tel Co
(312)824-LandlineMcimetro Access Transmission Services
(312)825-WirelessT-Mobile Usa
(312)826-WirelessT-Mobile Usa
(312)827-LandlineIllinois Bell Tel Co
(312)828-LandlineIllinois Bell Tel Co
(312)829-LandlineIllinois Bell Tel Co
(312)830-WirelessUsa Mobility Wireless
(312)831-LandlineIllinois Bell Tel Co
(312)832-LandlineIllinois Bell Tel Co
(312)833-WirelessVerizon Wireless
(312)834-LandlineIllinois Bell Tel Co
(312)835-WirelessVerizon Wireless
(312)836-LandlineIllinois Bell Tel Co
(312)837-LandlineComcast Ip Phone
(312)838-WirelessT-Mobile Usa
(312)839-LandlineAmerican Messaging Services
(312)840-LandlineIllinois Bell Tel Co
(312)841-WirelessNew Cingular Wireless Pcs
(312)842-LandlineIllinois Bell Tel Co
(312)843-LandlineTeleport Communications America
(312)844-WirelessNew Cingular Wireless Pcs
(312)845-LandlineIllinois Bell Tel Co
(312)846-LandlineIllinois Bell Tel Co
(312)847-LandlineOnvoy
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(312)849-LandlineIllinois Bell Tel Co
(312)850-LandlineIllinois Bell Tel Co
(312)851-WirelessUsa Mobility Wireless
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(312)853-LandlineIllinois Bell Tel Co
(312)854-LandlineRcn Telecom Services Of Illinios
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(312)856-LandlineIllinois Bell Tel Co
(312)857-LandlineIllinois Bell Tel Co
(312)858-LandlineRclec
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(312)860-WirelessNew Cingular Wireless Pcs
(312)861-LandlineIllinois Bell Tel Co
(312)862-LandlineIllinois Bell Tel Co
(312)863-LandlineOvation Communications Of Illinois
(312)864-LandlineIllinois Bell Tel Co
(312)865-WirelessNew Cingular Wireless Pcs
(312)866-WirelessT-Mobile Usa
(312)867-LandlineIllinois Bell Tel Co
(312)868-LandlineBandwidth.Com Clec
(312)869-LandlineIllinois Bell Tel Co
(312)870-LandlineFirst Communications
(312)871-LandlineMcimetro Access Transmission Services
(312)872-LandlineLevel 3 Communications
(312)873-LandlineMcimetro Access Transmission Services
(312)874-WirelessT-Mobile Usa
(312)875-LandlineIllinois Bell Tel Co
(312)876-LandlineIllinois Bell Tel Co
(312)877-LandlineAt&T
(312)878-LandlinePeerless Network Of Illinois
(312)879-LandlineIllinois Bell Tel Co
(312)880-LandlineIllinois Bell Tel Co
(312)881-LandlineOvation Communications Of Illinois
(312)882-WirelessVerizon Wireless
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(312)884-LandlineOvation Communications Of Illinois
(312)885-WirelessT-Mobile Usa
(312)886-LandlineIllinois Bell Tel Co
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(312)888-WirelessNew Cingular Wireless Pcs
(312)889-LandlineTeleport Communications America
(312)890-WirelessSprint Spectrum
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(312)893-LandlineLevel 3 Communications
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(312)897-LandlineMcimetro Access Transmission Services
(312)898-WirelessVerizon Wireless
(312)899-LandlineIllinois Bell Tel Co
(312)900-LandlineFractel
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(312)902-LandlineIllinois Bell Tel Co
(312)903-LandlineAmerican Messaging Services
(312)904-LandlineIllinois Bell Tel Co
(312)905-LandlineIllinois Bell Tel Co
(312)906-LandlineIllinois Bell Tel Co
(312)907-WirelessSprint Spectrum
(312)908-LandlineIllinois Bell Tel Co
(312)909-WirelessVerizon Wireless
(312)910-LandlineOnvoy
(312)912-LandlineIllinois Bell Tel Co
(312)913-LandlineIllinois Bell Tel Co
(312)914-WirelessVerizon Wireless
(312)915-LandlineIllinois Bell Tel Co
(312)916-LandlineAmerican Messaging Services
(312)917-LandlineIllinois Bell Tel Co
(312)918-WirelessT-Mobile Usa
(312)919-WirelessVerizon Wireless
(312)920-LandlineIllinois Bell Tel Co
(312)921-LandlineIllinois Bell Tel Co
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(312)923-LandlineIllinois Bell Tel Co
(312)924-LandlinePaetec Communications
(312)925-WirelessNew Cingular Wireless Pcs
(312)926-LandlineIllinois Bell Tel Co
(312)927-WirelessT-Mobile Usa
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(312)933-WirelessSprint Spectrum
(312)934-WirelessT-Mobile Usa
(312)935-LandlineIllinois Bell Tel Co
(312)936-LandlineIllinois Bell Tel Co
(312)937-WirelessVerizon Wireless
(312)938-LandlineIllinois Bell Tel Co
(312)939-LandlineIllinois Bell Tel Co
(312)940-LandlinePeerless Network Of Illinois
(312)941-WirelessUsa Mobility Wireless
(312)942-LandlineIllinois Bell Tel Co
(312)943-LandlineIllinois Bell Tel Co
(312)944-LandlineIllinois Bell Tel Co
(312)945-LandlineIllinois Bell Tel Co
(312)946-LandlineIllinois Bell Tel Co
(312)947-LandlineIllinois Bell Tel Co
(312)948-LandlineOvation Communications Of Illinois
(312)949-LandlineIllinois Bell Tel Co
(312)951-LandlineIllinois Bell Tel Co
(312)952-WirelessNew Cingular Wireless Pcs
(312)953-WirelessNew Cingular Wireless Pcs
(312)954-LandlineIllinois Bell Tel Co
(312)955-LandlineRcn Telecom Services Of Illinios
(312)956-WirelessNew Cingular Wireless Pcs
(312)957-LandlineIllinois Bell Tel Co
(312)960-LandlineIllinois Bell Tel Co
(312)961-WirelessNew Cingular Wireless Pcs
(312)962-LandlineGlobal Crossing Local Services
(312)963-WirelessUsa Mobility Wireless
(312)964-LandlineOnvoy
(312)965-WirelessVerizon Wireless
(312)966-LandlineMetropcs
(312)967-LandlineBandwidth.Com Clec
(312)968-WirelessVerizon Wireless
(312)969-WirelessVerizon Wireless
(312)970-LandlineIllinois Bell Tel Co
(312)971-LandlineBandwidth.Com Clec
(312)972-WirelessNew Cingular Wireless Pcs
(312)973-LandlineMcimetro Access Transmission Services
(312)974-LandlineIllinois Bell Tel Co
(312)975-WirelessT-Mobile Usa
(312)977-LandlineIllinois Bell Tel Co
(312)978-WirelessT-Mobile Usa
(312)979-LandlineIllinois Bell Tel Co
(312)980-LandlineTeleport Communications America
(312)981-LandlineOvation Communications Of Illinois
(312)982-LandlineComcast Ip Phone
(312)983-LandlineIllinois Bell Tel Co
(312)984-LandlineIllinois Bell Tel Co
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(312)986-LandlineIllinois Bell Tel Co
(312)987-LandlineIllinois Bell Tel Co
(312)988-LandlineIllinois Bell Tel Co
(312)989-WirelessNew Cingular Wireless Pcs
(312)990-WirelessNew Cingular Wireless Pcs
(312)991-WirelessNew Cingular Wireless Pcs
(312)992-LandlineIllinois Bell Tel Co
(312)993-LandlineIllinois Bell Tel Co
(312)994-LandlineOvation Communications Of Illinois
(312)995-LandlineTeleport Communications America
(312)996-LandlineIllinois Bell Tel Co
(312)997-LandlineIllinois Bell Tel Co
(312)998-LandlineCenturylink Communications
(312)999-LandlineXo Illinois

Frequently Asked Questions about the 312 Area Code

Who called me from a 312 number?

30% of its assigned prefixes are wireless. Largest holders: Illinois Bell Tel Co, New Cingular Wireless Pcs, and Verizon Wireless.

Is 312 a scam area code?

Carriers hold 78% of its possible prefixes.

Why do I keep getting calls from the 312 area code?

Complaints rose 11% on the prior period.

Should I answer an unknown 312 number?

51% of its FTC complaints were robocalls. Its most-reported specific subject was "Dropped call or no message", at 14%.

How do I block calls from the 312 area code?

Blocking 312 still lets 872 numbers through.

Where is area code 312?

312 covers 1 city and 348,013 residents in Cook County, Illinois.

When did area code 312 go into service?

312 went into service in 1947. 872 now shares its territory.

Is 312 a real area code?

Yes: 38 carriers hold its prefixes, serving Chicago in Cook County.

What timezone is the 312 area code in?

312 is on Central Time (CT).

How do I call a 312 number from abroad?

Dial +1 312, then the number.

Related Area Codes