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307 Area CodeCheyenne, WY

Area code 307 covers Cheyenne and nearby communities in Wyoming, in the Mountain Time (MT) zone, home to about 576,851 people across 203 cities. It's the only area code for this region, so the three digits alone place the caller.

Overview

Major City
Cheyenne
State
Wyoming (WY)
Timezone
Mountain Time (MT)
Current Time
–:––
Overlay
No – unique area code

Nearby Area Codes

  • 748/970 (Fort Collins, CO)
  • 303/720/983 (Denver, CO)
  • 719 (Colorado Springs, CO)
  • 308 (Grand Island, NE)
  • 406 (Billings, MT)
  • 385/801 (Salt Lake City, UT)
  • 620 (Hutchinson, KS)
  • 505 (Albuquerque, NM)

Where is area code 307?

Area code 307 serves part of Cheyenne, WY and the surrounding areas. It is a unique area code with no overlays.

Overview of the 307 Area Code

What is the 307 area code?

The 307 area code serves Cheyenne, Wyoming. When you see a 307 number, it indicates a local number within this geographic area.

Why was area code 307 created?

Area code 307 has been in service since January 1, 1947.

Geographic Coverage of the 307 Area Code

The 307 area code serves Cheyenne and surrounding areas in Wyoming. It operates within the Mountain Time (MT) time zone. This area code covers several key cities, including:

  • Cheyenne
  • Casper
  • Gillette
  • Laramie
  • Rock Springs
  • Sheridan

Got a call from a 307 number? It came from Cheyenne, WY. No other area code overlaps the 307 territory, so the prefix alone identifies where the caller is. Of the listed cities' population, Cheyenne accounts for about 14.4%; the rest is split across 202 smaller cities.

Cheyenne Area Code Overview

The 307 area code provides comprehensive telephone coverage for Cheyenne and its surrounding communities. As the sole area code for this region, it uniquely identifies all local numbers within the service area.

What cities does area code 307 cover?

CityStatePopulationPopulation in 307% of listed-city population% of City
CheyenneWY65,70465,70414.4%100.0%
CasperWY58,82358,82312.9%100.0%
GilletteWY33,84633,8467.4%100.0%
LaramieWY32,95732,9577.2%100.0%
Rock SpringsWY22,96722,9675.0%100.0%
SheridanWY19,81319,8134.3%100.0%
EvanstonWY11,69111,6912.6%100.0%
Green RiverWY11,47411,4742.5%100.0%
RivertonWY10,95310,9532.4%100.0%
JacksonWY10,68010,6802.3%100.0%
CodyWY10,39110,3912.3%100.0%
RawlinsWY7,9527,9521.7%100.0%
LanderWY7,4517,4511.6%100.0%
PowellWY6,5516,5511.4%100.0%
DouglasWY6,4426,4421.4%100.0%
TorringtonWY6,2116,2111.4%100.0%
RanchettesWY5,7985,7981.3%100.0%
WorlandWY4,7654,7651.0%100.0%
BuffaloWY4,6554,6551.0%100.0%
MillsWY4,5844,5841.0%100.0%
South GreeleyWY4,2174,2170.9%100.0%
Fox Farm-CollegeWY3,6473,6470.8%100.0%
WheatlandWY3,4753,4750.8%100.0%
NewcastleWY3,3543,3540.7%100.0%
Warren AFBWY3,0723,0720.7%100.0%
Bar NunnWY3,0193,0190.7%100.0%
EvansvilleWY2,8372,8370.6%100.0%
ThermopolisWY2,7482,7480.6%100.0%
GlenrockWY2,4122,4120.5%100.0%
KemmererWY2,3782,3780.5%100.0%
LovellWY2,3662,3660.5%100.0%
AftonWY2,2802,2800.5%100.0%
North Rock SpringsWY2,2072,2070.5%100.0%
LymanWY2,1912,1910.5%100.0%
Star Valley RanchWY2,0412,0410.5%100.0%
PinedaleWY2,0052,0050.4%100.0%
Moose Wilson RoadWY1,8211,8210.4%100.0%
SaratogaWY1,7601,7600.4%100.0%
Fort WashakieWY1,7591,7590.4%100.0%
South ParkWY1,7311,7310.4%100.0%
GreybullWY1,7151,7150.4%100.0%
WrightWY1,6601,6600.4%100.0%
Antelope Valley-CrestviewWY1,6581,6580.4%100.0%
ArapahoeWY1,6561,6560.4%100.0%
EtheteWY1,5531,5530.3%100.0%
WilsonWY1,4821,4820.3%100.0%
LuskWY1,4011,4010.3%100.0%
AlpineWY1,3601,3600.3%100.0%
BasinWY1,3371,3370.3%100.0%
Sleepy HollowWY1,3081,3080.3%100.0%
Mountain ViewWY1,2681,2680.3%100.0%
Mountain ViewWY1,2681,2680.3%100.0%
RanchesterWY1,1761,1760.3%100.0%
HobackWY1,1761,1760.3%100.0%
SundanceWY1,1231,1230.3%100.0%
Pine BluffsWY1,1111,1110.2%100.0%
GuernseyWY1,0941,0940.2%100.0%
Rafter J RanchWY1,0751,0750.2%100.0%
MoorcroftWY1,0251,0250.2%100.0%
DuboisWY9899890.2%100.0%
Vista WestWY9519510.2%100.0%
UptonWY9009000.2%100.0%
CowleyWY8598590.2%100.0%
MarbletonWY8458450.2%100.0%
DaytonWY8298290.2%100.0%
StoryWY8288280.2%100.0%
Clearview AcresWY7957950.2%100.0%
RelianceWY7147140.2%100.0%
HartrandtWY6936930.2%100.0%
HannaWY6606600.2%100.0%
NordicWY6026020.1%100.0%
ByronWY5775770.1%100.0%
Pine HavenWY5655650.1%100.0%
James TownWY5365360.1%100.0%
LucerneWY5355350.1%100.0%
Purple SageWY5355350.1%100.0%
Bear RiverWY5215210.1%100.0%
DiamondvilleWY5175170.1%100.0%
ShoshoniWY5005000.1%100.0%
CokevilleWY4904900.1%100.0%
Big HornWY4904900.1%100.0%
Red ButteWY4494490.1%100.0%
La GrangeWY4484480.1%100.0%
EncampmentWY4444440.1%100.0%
HudsonWY4364360.1%100.0%
ThayneWY4324320.1%100.0%
Rolling HillsWY4264260.1%100.0%
Boulder FlatsWY4084080.1%100.0%
BaggsWY4074070.1%100.0%
Casper MountainWY4014010.1%100.0%
LingleWY3983980.1%100.0%
OsmondWY3973970.1%100.0%
La BargeWY3953950.1%100.0%
AltaWY3943940.1%100.0%
Big PineyWY3903900.1%100.0%
BurnsWY3793790.1%100.0%
BurlingtonWY3793790.1%100.0%
SinclairWY3613610.1%100.0%
Fort BridgerWY3453450.1%100.0%
HulettWY3413410.1%100.0%
Teton VillageWY3303300.1%100.0%
AuburnWY3283280.1%100.0%
MeeteetseWY3163160.1%100.0%
FarsonWY3133130.1%100.0%
MidwestWY2912910.1%100.0%
KayceeWY2832830.1%100.0%
EdenWY2812810.1%100.0%
RalstonWY2802800.1%100.0%
Homa HillsWY2782780.1%100.0%
FairviewWY2752750.1%100.0%
CentennialWY2702700.1%100.0%
MammothWY2632630.1%100.0%
UrieWY2622620.1%100.0%
Ten SleepWY2622620.1%100.0%
Alpine NorthwestWY2442440.1%100.0%
JohnstownWY2422420.1%100.0%
GlendoWY2382380.1%100.0%
Medicine BowWY2382380.1%100.0%
East ThermopolisWY2322320.1%100.0%
PavillionWY2292290.1%100.0%
Rock RiverWY2242240.1%100.0%
Fort LaramieWY2222220.1%100.0%
FreedomWY2142140.1%100.0%
OsageWY2082080.1%100.0%
BedfordWY2012010.1%100.0%
Bessemer BendWY1991990.1%100.0%
Meadow AcresWY1981980.1%100.0%
WamsutterWY1971970.0%100.0%
Alpine NortheastWY1961960.0%100.0%
SmootWY1951950.0%100.0%
Y-O RanchWY1951950.0%100.0%
TurnervilleWY1921920.0%100.0%
BrookhurstWY1851850.0%100.0%
SuperiorWY1831830.0%100.0%
DeaverWY1711710.0%100.0%
Hill View HeightsWY1701700.0%100.0%
BoulderWY1701700.0%100.0%
ChugwaterWY1691690.0%100.0%
EtnaWY1641640.0%100.0%
AlbinWY1621620.0%100.0%
ChugcreekWY1561560.0%100.0%
EdgertonWY1551550.0%100.0%
ParkmanWY1511510.0%100.0%
DanielWY1501500.0%100.0%
Elk MountainWY1481480.0%100.0%
GroverWY1471470.0%100.0%
FrannieWY1461460.0%100.0%
CoraWY1421420.0%100.0%
CrowheartWY1411410.0%100.0%
KellyWY1381380.0%100.0%
YoderWY1331330.0%100.0%
ClearmontWY1241240.0%100.0%
GarlandWY1151150.0%100.0%
GrangerWY97970.0%100.0%
Antelope HillsWY97970.0%100.0%
RobertsonWY97970.0%100.0%
Woods Landing-JelmWY97970.0%100.0%
CarpenterWY94940.0%100.0%
BondurantWY93930.0%100.0%
ManvilleWY91910.0%100.0%
TaylorWY90900.0%100.0%
MandersonWY89890.0%100.0%
Lakeview NorthWY84840.0%100.0%
ShellWY83830.0%100.0%
WhitingWY83830.0%100.0%
SlaterWY80800.0%100.0%
AlcovaWY76760.0%100.0%
KirbyWY75750.0%100.0%
HyattvilleWY75750.0%100.0%
DixonWY74740.0%100.0%
BeulahWY73730.0%100.0%
Little AmericaWY68680.0%100.0%
HartvilleWY68680.0%100.0%
RiversideWY66660.0%100.0%
BairoilWY66660.0%100.0%
OpalWY64640.0%100.0%
Arrowhead SpringsWY63630.0%100.0%
McKinnonWY60600.0%100.0%
Jeffrey CityWY58580.0%100.0%
AlbanyWY55550.0%100.0%
Westview CircleWY52520.0%100.0%
EsterbrookWY52520.0%100.0%
WashamWY51510.0%100.0%
LonetreeWY49490.0%100.0%
OakleyWY49490.0%100.0%
HillsdaleWY47470.0%100.0%
OrinWY46460.0%100.0%
Hawk SpringsWY45450.0%100.0%
Powder RiverWY44440.0%100.0%
Lance CreekWY43430.0%100.0%
ArvadaWY43430.0%100.0%
Ryan ParkWY38380.0%100.0%
Atlantic CityWY37370.0%100.0%
HuntleyWY30300.0%100.0%
ArlingtonWY25250.0%100.0%
VeteranWY23230.0%100.0%
Van TassellWY22220.0%100.0%
Fox ParkWY22220.0%100.0%
FontenelleWY13130.0%100.0%
CarterWY10100.0%100.0%
Owl CreekWY550.0%100.0%
Lost SpringsWY440.0%100.0%
Table RockWY000.0%100.0%

City population is shown in full. The share of each city inside 307 is measured from Census tract centroids, not estimated from a rate-center match – so a city split between two codes appears on both, at the fraction each one actually holds. The “% of listed-city population” column uses the full populations of the cities listed here.

What counties does area code 307 cover?

576,851 residents across 23 counties, counted inside the 307 boundary — a county split between codes contributes only its part.

CountyStatePopulation in 307% of area-code footprint% of County
Laramie CountyWY100,51217%100%
Natrona CountyWY79,95514%100%
Campbell CountyWY47,0268%100%
Sweetwater CountyWY42,2727%100%
Fremont CountyWY39,2347%100%
Albany CountyWY37,0666%100%
Sheridan CountyWY30,9215%100%
Park CountyWY29,6245%100%
Teton CountyWY23,3314%100%
Uinta CountyWY20,4504%100%
Lincoln CountyWY19,5813%100%
Carbon CountyWY14,5373%100%
Converse CountyWY13,7512%100%
Goshen CountyWY12,4982%100%
Big Horn CountyWY11,5212%100%
Sublette CountyWY8,7282%100%
Platte CountyWY8,6051%100%
Johnson CountyWY8,4471%100%
Washakie CountyWY7,6851%100%
Crook CountyWY7,1811%100%
Weston CountyWY6,8381%100%
Hot Springs CountyWY4,6211%100%
Niobrara CountyWY2,4670%100%

Sources: City populations – U.S. Census Bureau PEP, Vintage 2024 (SUB-IP-EST2024-POP). State populations – the same program, Vintage 2025 (CO-EST2025-ALLDATA). Area-code footprint and county populations – 2020 Census Centers of Population, mapped against NANP area code boundaries. The share of each city inside a code is measured the same way, against Census place boundaries from the Census Bureau's TIGERweb service. Area code assignments – NANPA CO Code data. See our data methodology.

Has area code 307 been reported for unwanted calls?

Yes – 1,198 unwanted-call complaints were reported to the FTC for numbers showing a 307 area code (May 29 – Aug 14, 2026).

  • 74% robocalls
  • 21% vs prior period

Most-reported subjects

  • Other41%493
  • Reducing your debt (credit cards, mortgage, student loans)39%462
  • Calls pretending to be government, businesses, or family and friends5%56

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. Source: FTC Do Not Call (DNC) Reported Calls Data, retrieved 2026-08-17.

Which prefixes and exchanges belong to area code 307?

46% assigned to a telco

  • 76% Landline
  • 24% Wireless
  • 0% Unknown
PrefixUsageCarrier
(307)200-LandlineLevel 3 Communications
(307)201-LandlineLevel 3 Communications
(307)202-WirelessNew Cingular Wireless Pcs
(307)203-WirelessT-Mobile Usa
(307)204-LandlineAirus
(307)205-LandlineLevel 3 Communications
(307)206-LandlineMcimetro Access Transmission Services
(307)207-LandlineAirus
(307)209-WirelessVerizon Wireless
(307)210-WirelessNew Cingular Wireless Pcs
(307)212-LandlineLevel 3 Communications
(307)213-LandlineLevel 3 Communications
(307)214-WirelessVerizon Wireless
(307)215-LandlineAt&T
(307)216-WirelessNew Cingular Wireless Pcs
(307)217-WirelessNew Cingular Wireless Pcs
(307)218-LandlineOnvoy
(307)219-LandlineCenturylink Communications
(307)220-WirelessT-Mobile Usa
(307)221-WirelessT-Mobile Usa
(307)222-LandlineLevel 3 Communications
(307)223-LandlineLevel 3 Communications
(307)224-LandlineLevel 3 Communications
(307)225-LandlineBresnan Broadband Of Wyoming, Llc - Wy [charter]
(307)226-LandlineMcimetro Access Transmission Services
(307)227-LandlineCenturylink Communications
(307)228-LandlineBandwidth.Com Clec
(307)229-LandlineGold Star Communications
(307)230-LandlineBandwidth.Com Clec
(307)231-WirelessVerizon Wireless
(307)232-LandlineQwest
(307)233-LandlineQwest
(307)234-LandlineQwest
(307)235-LandlineQwest
(307)236-WirelessNew Cingular Wireless Pcs
(307)237-LandlineQwest
(307)238-WirelessNew Cingular Wireless Pcs
(307)239-LandlineGold Star Communications
(307)240-WirelessVerizon Wireless
(307)241-WirelessNew Cingular Wireless Pcs
(307)242-LandlineQwest
(307)243-LandlineOnvoy
(307)244-LandlineSilver Star Tel Co
(307)245-LandlineRt Communications
(307)246-LandlineRt Communications
(307)247-WirelessNew Cingular Wireless Pcs
(307)248-WirelessVerizon Wireless
(307)249-LandlineTelnyx
(307)250-WirelessVerizon Wireless
(307)251-WirelessVerizon Wireless
(307)252-LandlineUintah Basin Electronic Telecommunications
(307)253-LandlineQwest
(307)254-WirelessVerizon Wireless
(307)255-LandlineUintah Basin Electronic Telecommunications
(307)256-LandlineMetropcs
(307)257-LandlineLevel 3 Communications
(307)258-WirelessVerizon Wireless
(307)259-WirelessVerizon Wireless
(307)260-LandlineUnion Telephone
(307)261-LandlineQwest
(307)262-WirelessVerizon Wireless
(307)263-WirelessCsc Wireless
(307)264-LandlineBresnan Broadband Of Wyoming, Llc - Wy [charter]
(307)265-LandlineQwest
(307)266-LandlineQwest
(307)267-WirelessNew Cingular Wireless Pcs
(307)268-LandlineQwest
(307)269-LandlineLevel 3 Communications
(307)270-LandlineUnion Telephone
(307)271-LandlineLevel 3 Communications
(307)272-WirelessVerizon Wireless
(307)273-LandlineCenturylink
(307)274-LandlineMcimetro Access Transmission Services
(307)275-WirelessVerizon Wireless
(307)276-LandlineCenturylink
(307)277-WirelessVerizon Wireless
(307)278-LandlineLevel 3 Communications
(307)279-LandlineAll West Communications
(307)280-LandlineUnion Telephone
(307)281-WirelessVerizon Wireless
(307)282-WirelessVerizon Wireless
(307)283-LandlineRange Tel Coop
(307)284-LandlineSilver Star Telephone Company
(307)285-LandlineAirus
(307)286-WirelessVerizon Wireless
(307)287-WirelessVerizon Wireless
(307)288-LandlineLevel 3 Communications
(307)290-WirelessNew Cingular Wireless Pcs
(307)291-LandlineCommio
(307)292-LandlineHd Carrier
(307)293-LandlineOnvoy
(307)296-LandlineOnvoy
(307)297-LandlineUintah Basin Electronic Telecommunications
(307)298-LandlineLevel 3 Communications
(307)299-WirelessNew Cingular Wireless Pcs
(307)300-LandlineOnvoy
(307)302-LandlineBandwidth.Com Clec
(307)303-LandlineBandwidth.Com Clec
(307)304-WirelessNew Cingular Wireless Pcs
(307)305-WirelessNew Cingular Wireless Pcs
(307)306-LandlineStratus Networks
(307)309-WirelessNew Cingular Wireless Pcs
(307)310-LandlineOnvoy Spectrum
(307)312-LandlineBandwidth.Com Clec
(307)313-LandlineLevel 3 Communications
(307)314-LandlineBandwidth.Com Clec
(307)315-LandlineBresnan Broadband Of Wyoming, Llc - Wy [charter]
(307)316-LandlineOnvoy
(307)317-LandlineOnvoy
(307)318-LandlineBandwidth.Com Clec
(307)319-WirelessNew Cingular Wireless Pcs
(307)320-LandlineUnion Telephone
(307)321-WirelessVerizon Wireless
(307)322-LandlineQwest
(307)323-LandlineRadiantiq
(307)324-LandlineQwest
(307)325-LandlineUnion Tel. Co.
(307)326-LandlineUnion Tel. Co.
(307)327-LandlineUnion Tel. Co.
(307)328-LandlineQwest
(307)329-LandlineUnion Telephone
(307)330-LandlineUnion Telephone
(307)331-WirelessVerizon Wireless
(307)332-LandlineQwest
(307)333-LandlineBresnan Broadband Of Wyoming, Llc - Wy [charter]
(307)334-LandlineQwest
(307)335-LandlineQwest
(307)336-LandlineOnvoy
(307)337-LandlineBresnan Broadband Of Wyoming, Llc - Wy [charter]
(307)338-WirelessVerizon Wireless
(307)339-LandlineUnion Telephone
(307)340-WirelessVerizon Wireless
(307)341-LandlineProject Tel. Co.
(307)342-LandlineOnvoy
(307)343-WirelessVerizon Wireless
(307)344-LandlineQwest
(307)345-LandlineUnion Telephone
(307)346-WirelessDish Wireless
(307)347-LandlineRt Communications
(307)348-LandlineUnion Tel. Co.
(307)349-WirelessVerizon Wireless
(307)350-LandlineUnion Telephone
(307)351-WirelessNew Cingular Wireless Pcs
(307)352-LandlineQwest
(307)353-LandlineSilver Star Communications
(307)354-LandlineUnion Telephone
(307)355-WirelessT-Mobile Usa
(307)356-LandlineUnion Tel. Co.
(307)358-LandlineQwest
(307)359-WirelessVerizon Wireless
(307)360-LandlineUnion Telephone
(307)361-WirelessNew Cingular Wireless Pcs
(307)362-LandlineQwest
(307)363-LandlineBandwidth.Com Clec
(307)364-LandlineBandwidth.Com Clec
(307)365-WirelessNew Cingular Wireless Pcs
(307)366-LandlineTri-County Tel. Assn.
(307)367-LandlineCenturylink
(307)368-WirelessVerizon Wireless
(307)369-LandlineBresnan Broadband Of Wyoming, Llc - Wy [charter]
(307)370-WirelessVerizon Wireless
(307)371-WirelessVerizon Wireless
(307)372-LandlineOnvoy
(307)373-LandlineBresnan Broadband Of Wyoming, Llc - Wy [charter]
(307)374-LandlineVonage America
(307)375-LandlineRt Communications
(307)376-WirelessNew Cingular Wireless Pcs
(307)377-LandlineUnion Telephone
(307)378-LandlineUnion Tel. Co.
(307)379-LandlineCenturylink
(307)380-LandlineUnion Telephone
(307)381-LandlineBandwidth.Com Clec
(307)382-LandlineQwest
(307)383-LandlineDubois Tel. Exch.
(307)384-LandlineCommio
(307)386-LandlineUnion Tel. Co.
(307)387-LandlineBandwidth.Com Clec
(307)388-WirelessNew Cingular Wireless Pcs
(307)389-WirelessVerizon Wireless
(307)390-LandlineUnion Telephone
(307)391-WirelessNew Cingular Wireless Pcs
(307)392-LandlineLevel 3 Communications
(307)393-LandlineAirus
(307)394-WirelessT-Mobile Usa
(307)395-LandlineBandwidth.Com Clec
(307)396-LandlineBandwidth.Com Clec
(307)397-WirelessNew Cingular Wireless Pcs
(307)398-WirelessNew Cingular Wireless Pcs
(307)399-WirelessVerizon Wireless
(307)400-LandlineTerra Nova Telecom
(307)401-WirelessNew Cingular Wireless Pcs
(307)402-WirelessNew Cingular Wireless Pcs
(307)403-LandlineBandwidth.Com Clec
(307)404-WirelessNew Cingular Wireless Pcs
(307)407-LandlineOnvoy
(307)408-WirelessNew Cingular Wireless Pcs
(307)409-WirelessNew Cingular Wireless Pcs
(307)410-WirelessT-Mobile Usa
(307)412-LandlineAt&T
(307)413-WirelessNew Cingular Wireless Pcs
(307)414-LandlineAirus
(307)415-LandlineNuso
(307)417-LandlineOnvoy
(307)419-WirelessT-Mobile Usa
(307)421-WirelessVerizon Wireless
(307)422-LandlineChugwater Tel. Co.
(307)423-LandlineBandwidth.Com Clec
(307)425-LandlineAdvanced Communications Technology
(307)426-LandlineBresnan Broadband Of Wyoming, Llc - Wy [charter]
(307)429-LandlineBandwidth.Com Clec
(307)431-WirelessVerizon Wireless
(307)432-LandlineQwest
(307)433-LandlineQwest
(307)436-LandlineQwest
(307)437-LandlineRt Communications
(307)438-WirelessVerizon Wireless
(307)439-LandlineLevel 3 Communications
(307)440-LandlineBresnan Broadband Of Wyoming, Llc - Wy [charter]
(307)441-WirelessVerizon Wireless
(307)443-LandlineCommio
(307)444-LandlineAll West/Wyoming
(307)445-LandlineOnvoy
(307)447-LandlineLevel 3 Communications
(307)448-WirelessVerizon Wireless
(307)450-LandlineUnion Telephone
(307)455-LandlineDubois Tel. Exch.
(307)456-LandlineOnvoy
(307)457-LandlineRt Communications
(307)458-WirelessDish Wireless
(307)459-LandlineLevel 3 Communications
(307)460-LandlineLevel 3 Communications
(307)461-LandlineLevel 3 Communications
(307)462-LandlineLevel 3 Communications
(307)463-LandlineLevel 3 Communications
(307)464-LandlineQwest
(307)465-LandlineRt Communications
(307)466-WirelessVerizon Wireless
(307)467-LandlineRt Communications
(307)468-LandlineRt Communications
(307)469-LandlineTri-County Tel. Assn.
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Frequently Asked Questions about the 307 Area Code

Who called me from a 307 number?

A 307 number is assigned to Cheyenne, Wyoming, so a call may come from there. But caller ID is easy to fake, and scammers often spoof a local 307 code to look nearby, so a 307 number doesn't prove the caller is local. Recently, 1,198 unwanted-call complaints were reported to the FTC for numbers showing the 307 code (74% flagged as robocalls). If you don't recognize the number, let it go to voicemail; a real caller will leave a message.

Is 307 a scam area code?

No area code is a scam on its own. 307 is a normal, officially assigned code for Cheyenne, Wyoming. Spam callers spoof local codes to raise the odds you answer, so 307 on your caller ID says nothing about who is really calling. Recently, 1,198 unwanted-call complaints were reported to the FTC for numbers showing the 307 code (74% flagged as robocalls). Judge the call itself, not the area code.

Why do I keep getting calls from the 307 area code?

Repeated calls from different 307 numbers are usually spoofing: a robocaller rotates through 307 numbers so each call looks local and slips past simple blocks. Recently, 1,198 unwanted-call complaints were reported to the FTC for numbers showing the 307 code (74% flagged as robocalls). Blocking one number rarely helps; voicemail screening, your carrier spam filter, and the Do Not Call Registry work better.

Should I answer an unknown 307 number?

If you aren't expecting a 307 call, let it ring to voicemail. Legitimate callers leave a message, most robocallers hang up when no one picks up, and answering can mark your number as active and bring more calls.

How do I block calls from the 307 area code?

Block a single 307 number from your recent-calls list (iPhone: tap the number, then Block this Caller; Android: tap the number, then Block or report spam). To cut the volume, turn on Silence Unknown Callers on iPhone or spam protection on Android, enable spam filtering from your carrier, and register at DoNotCall.gov. Blocking the entire 307 code also stops legitimate local calls, so use it only as a last resort.

Where is area code 307?

Area code 307 covers Cheyenne and the surrounding area in Wyoming, spanning 203 cities with about 576,851 residents. No other code overlays this region, so 307 alone identifies the area.

When did area code 307 go into service?

Area code 307 went into service on January 1, 1947.

Is 307 a real area code?

Yes. 307 is an active code in the North American Numbering Plan, assigned by NANPA and in service for Cheyenne, Wyoming. A real code can still show up on spoofed spam calls, so treat unknown 307 calls with normal caution.

What timezone is the 307 area code in?

The 307 area code is in the Mountain Time (MT). Because a number can be kept when someone moves or switches to VoIP, a specific 307 caller may not be in that zone.

How do I call a 307 number from abroad?

From outside the US, dial your country's exit code, then 1 (the US country code), then 307 and the seven-digit number. From a mobile phone you can usually just enter +1 307 followed by the number and let the phone add the exit code for you.

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