840 Area CodeSan Bernardino, CA
Area code 840 covers San Bernardino and nearby communities in California, in the Pacific Time (PT) zone, home to about 2,007,311 people across 38 cities. It was added in 2021 as an overlay of 909, so the same region uses both codes and every local call needs all ten digits.
Overview
- Major City
- San Bernardino
- State
- California (CA)
- Timezone
- Pacific Time (PT)
- Current Time
- –:––
- Overlay
- Yes – shares area with 909
Where is area code 840?
Area code 840 serves part of San Bernardino, CA and the surrounding areas. It has a single overlay (909) that serves the same area.
Overview of the 840 Area Code
What is the 840 area code?
The 840 area code serves San Bernardino, California, alongside other established area codes. When you see a 840 number, it indicates a local number within this geographic area.
Why was area code 840 created?
Area code 840 went into service on February 23, 2021, as an overlay of 909. An overlay adds a second code to the same territory instead of splitting it: existing 909 numbers kept their digits, new lines began receiving 840 numbers, and local calls in the region require all ten digits.
Geographic Coverage of the 840 Area Code
The 840 area code serves San Bernardino and surrounding areas in California. It operates within the Pacific Time (PT) time zone. It complements the coverage of area code 909. This area code covers several key cities, including:
- San Bernardino
- Fontana
- Ontario
- Rancho Cucamonga
- Pomona
- Rialto
Got a call from an 840 number? It came from San Bernardino, CA. Since 840 overlays with 909, every local call in the region needs all ten digits to land on the right line. Of the listed cities' population, San Bernardino accounts for about 10.8%; the rest is split across 37 smaller cities.
San Bernardino Area Codes Overview
San Bernardino is served by multiple area codes, reflecting its telecommunications needs. The 840 area code operates alongside 909. Here are the area codes serving this region:
The introduction of the 840 area code helped prevent number exhaustion, ensuring a continuous supply of phone numbers across the geographic area.
What cities does area code 840 cover?
| City | State | Population | Population in 840 | % of listed-city population | % of City |
|---|---|---|---|---|---|
| San Bernardino | CA | 224,775 | 224,775 | 10.8% | 100.0% |
| Fontana | CA | 218,455 | 218,455 | 10.5% | 100.0% |
| Ontario | CA | 185,285 | 185,285 | 8.9% | 100.0% |
| Rancho Cucamonga | CA | 176,675 | 176,675 | 8.5% | 100.0% |
| Pomona | CA | 147,966 | 147,966 | 7.1% | 100.0% |
| Rialto | CA | 104,918 | 104,918 | 5.0% | 100.0% |
| Chino | CA | 94,010 | 94,010 | 4.5% | 100.0% |
| Upland | CA | 79,684 | 79,684 | 3.8% | 100.0% |
| Chino Hills | CA | 77,418 | 77,418 | 3.7% | 100.0% |
| Redlands | CA | 74,279 | 74,279 | 3.6% | 100.0% |
| Eastvale | CA | 70,751 | 7,619 | 3.4% | 10.8% |
| Beaumont | CA | 59,502 | 17,663 | 2.9% | 29.7% |
| Highland | CA | 56,499 | 56,499 | 2.7% | 100.0% |
| Yucaipa | CA | 54,465 | 54,465 | 2.6% | 100.0% |
| Colton | CA | 53,528 | 53,528 | 2.6% | 100.0% |
| Diamond Bar | CA | 52,292 | 52,292 | 2.5% | 100.0% |
| Rowland Heights | CA | 48,993 | 16,345 | 2.3% | 33.4% |
| Montclair | CA | 37,650 | 37,650 | 1.8% | 100.0% |
| Claremont | CA | 36,139 | 36,139 | 1.7% | 100.0% |
| San Dimas | CA | 33,226 | 27,361 | 1.6% | 82.3% |
| La Verne | CA | 30,192 | 30,192 | 1.4% | 100.0% |
| Walnut | CA | 27,250 | 20,251 | 1.3% | 74.3% |
| Loma Linda | CA | 25,197 | 25,197 | 1.2% | 100.0% |
| Bloomington | CA | 23,851 | 23,851 | 1.1% | 100.0% |
| Grand Terrace | CA | 12,979 | 12,979 | 0.6% | 100.0% |
| Lake Arrowhead | CA | 12,424 | 12,424 | 0.6% | 100.0% |
| Big Bear City | CA | 12,304 | 12,304 | 0.6% | 100.0% |
| Calimesa | CA | 11,150 | 11,150 | 0.5% | 100.0% |
| Crestline | CA | 10,770 | 10,770 | 0.5% | 100.0% |
| Muscoy | CA | 10,644 | 10,644 | 0.5% | 100.0% |
| Mentone | CA | 8,720 | 8,720 | 0.4% | 100.0% |
| Big Bear Lake | CA | 5,044 | 5,044 | 0.2% | 100.0% |
| Running Springs | CA | 4,862 | 4,862 | 0.2% | 100.0% |
| Highgrove | CA | 3,988 | 0 | 0.2% | 0.0% |
| San Antonio Heights | CA | 3,371 | 3,371 | 0.2% | 100.0% |
| Lytle Creek | CA | 701 | 701 | 0.0% | 100.0% |
| Oak Glen | CA | 638 | 638 | 0.0% | 100.0% |
| Industry | CA | 256 | 0 | 0.0% | 0.0% |
City population is shown in full. The share of each city inside 840 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 840 cover?
2,007,311 residents across 3 counties, counted inside the 840 boundary — a county split between codes contributes only its part.
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 840 been reported for unwanted calls?
Yes – 247 unwanted-call complaints were reported to the FTC for numbers showing a 840 area code (May 29 – Aug 14, 2026).
- 72% robocalls
- ↑ 17% vs prior period
Most-reported subjects
- Other43%105
- Reducing your debt (credit cards, mortgage, student loans)26%64
- Calls pretending to be government, businesses, or family and friends15%36
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 840?
6% assigned to a telco
- 64% Landline
- 36% Wireless
- 0% Unknown
of 59 | ||
| Prefix | Usage | Carrier |
|---|---|---|
| (840)200- | Landline | Fractel |
| (840)201- | Wireless | New Cingular Wireless Pcs |
| (840)202- | Wireless | New Cingular Wireless Pcs |
| (840)203- | Wireless | New Cingular Wireless Pcs |
| (840)204- | Wireless | New Cingular Wireless Pcs |
| (840)205- | Landline | Bandwidth.Com Clec |
| (840)206- | Wireless | New Cingular Wireless Pcs |
| (840)207- | Wireless | T-Mobile Usa |
| (840)208- | Landline | Bandwidth.Com Clec |
| (840)209- | Wireless | T-Mobile Usa |
| (840)210- | Wireless | T-Mobile Usa |
| (840)212- | Wireless | T-Mobile Usa |
| (840)213- | Wireless | T-Mobile Usa |
| (840)214- | Wireless | T-Mobile Usa |
| (840)215- | Wireless | T-Mobile Usa |
| (840)216- | Wireless | T-Mobile Usa |
| (840)217- | Wireless | T-Mobile Usa |
| (840)218- | Wireless | Verizon Wireless |
| (840)219- | Wireless | T-Mobile Usa |
| (840)220- | Landline | Bandwidth.Com Clec |
| (840)221- | Landline | Hd Carrier |
| (840)222- | Landline | Fractel |
| (840)223- | Landline | Bandwidth.Com Clec |
| (840)224- | Wireless | New Cingular Wireless Pcs |
| (840)225- | Wireless | New Cingular Wireless Pcs |
| (840)228- | Wireless | Verizon Wireless |
| (840)229- | Wireless | Verizon Wireless |
| (840)234- | Landline | Fractel |
| (840)240- | Landline | Onvoy |
| (840)252- | Wireless | T-Mobile Usa |
| (840)300- | Landline | Fractel |
| (840)333- | Landline | Fractel |
| (840)336- | Landline | Fractel |
| (840)345- | Landline | Fractel |
| (840)356- | Landline | Fractel |
| (840)400- | Landline | Fractel |
| (840)444- | Landline | Fractel |
| (840)465- | Landline | Fractel |
| (840)466- | Landline | Ton80 Communications |
| (840)500- | Landline | Fractel |
| (840)587- | Landline | Fractel |
| (840)588- | Landline | Fractel |
| (840)600- | Landline | Fractel |
| (840)666- | Landline | Fractel |
| (840)677- | Landline | Fractel |
| (840)688- | Landline | Fractel |
| (840)699- | Landline | Fractel |
| (840)777- | Landline | Terra Nova Telecom |
| (840)788- | Landline | Fractel |
| (840)799- | Landline | Fractel |
| (840)800- | Landline | Fractel |
| (840)804- | Landline | Onvoy |
| (840)837- | Landline | Ton80 Communications |
| (840)877- | Landline | Fractel |
| (840)888- | Landline | Terra Nova Telecom |
| (840)899- | Landline | Fractel |
| (840)900- | Landline | Fractel |
| (840)977- | Landline | Fractel |
| (840)999- | Landline | Terra Nova Telecom |
| No prefixes match “”. | ||
Frequently Asked Questions about the 840 Area Code
Who called me from a 840 number?
A 840 number is assigned to San Bernardino, California, so a call may come from there. But caller ID is easy to fake, and scammers often spoof a local 840 code to look nearby, so a 840 number doesn't prove the caller is local. Recently, 247 unwanted-call complaints were reported to the FTC for numbers showing the 840 code (72% flagged as robocalls). If you don't recognize the number, let it go to voicemail; a real caller will leave a message.
Is 840 a scam area code?
No area code is a scam on its own. 840 is a normal, officially assigned code for San Bernardino, California. Spam callers spoof local codes to raise the odds you answer, so 840 on your caller ID says nothing about who is really calling. Recently, 247 unwanted-call complaints were reported to the FTC for numbers showing the 840 code (72% flagged as robocalls). Judge the call itself, not the area code.
Why do I keep getting calls from the 840 area code?
Repeated calls from different 840 numbers are usually spoofing: a robocaller rotates through 840 numbers so each call looks local and slips past simple blocks. Recently, 247 unwanted-call complaints were reported to the FTC for numbers showing the 840 code (72% 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 840 number?
If you aren't expecting a 840 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 840 area code?
Block a single 840 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 840 code also stops legitimate local calls, so use it only as a last resort.
Where is area code 840?
Area code 840 covers San Bernardino and the surrounding area in California, spanning 38 cities with about 2,007,311 residents. It shares its area with overlay code 909.
When did area code 840 go into service?
Area code 840 went into service on February 23, 2021. It was added as an overlay of 909, so 840 numbers serve the same area that 909 already covered.
Is 840 a real area code?
Yes. 840 is an active code in the North American Numbering Plan, assigned by NANPA and in service for San Bernardino, California. A real code can still show up on spoofed spam calls, so treat unknown 840 calls with normal caution.
What timezone is the 840 area code in?
The 840 area code is in the Pacific Time (PT). Because a number can be kept when someone moves or switches to VoIP, a specific 840 caller may not be in that zone.
How do I call a 840 number from abroad?
From outside the US, dial your country's exit code, then 1 (the US country code), then 840 and the seven-digit number. From a mobile phone you can usually just enter +1 840 followed by the number and let the phone add the exit code for you.