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 2.1 million people across 38 cities. It's the only area code for this region, so the three digits alone place the caller.
Overview
- Major City
- San Bernardino
- State
- California (CA)
- Timezone
- Pacific Time (PT)
- Current Time
- Overlay
- No – unique area code
Where is area code 840?
Area code 840 serves part of San Bernardino, CA and the surrounding areas. It is a unique area code with no overlays.
Overview of the 840 Area Code
What is the 840 area code?
The 840 area code serves San Bernardino, California. When you see a 840 number, it indicates a local number within this geographic area.
Why was area code 840 created?
The 840 area code was established to serve the San Bernardino region in California. It provides telephone number coverage across 38 cities.
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. 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. No other area code overlaps the 840 territory, so the prefix alone identifies where the caller is. Inside 840, San Bernardino holds about 11% of the population; the rest is split across 37 smaller cities.
San Bernardino Area Code Overview
The 840 area code provides comprehensive telephone coverage for San Bernardino 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 840 cover?
| City | State | Population | % of Area Code | % of City |
|---|---|---|---|---|
| San Bernardino | CA | 224,775 | 4% | 100% |
| Fontana | CA | 218,455 | 3% | 98% |
| Ontario | CA | 185,285 | 3% | 100% |
| Rancho Cucamonga | CA | 176,675 | 3% | 100% |
| Pomona | CA | 147,966 | 2% | 100% |
| Rialto | CA | 104,918 | 2% | 98% |
| Chino | CA | 94,010 | 2% | 100% |
| Upland | CA | 79,684 | 1% | 100% |
| Chino Hills | CA | 77,418 | 3% | 96% |
| Redlands | CA | 74,279 | 3% | 100% |
* Sources: Population – U.S. Census Bureau PEP, Vintage 2024 (SUB-IP-EST2024-POP). Area code assignments – NANPA CO Code data. See our data methodology.
Has area code 840 been reported for unwanted calls?
Yes – 109 unwanted-call complaints were reported to the FTC for numbers showing a 840 area code (May 29 – Jul 2, 2026).
- 74% robocalls
- ↑ 10% vs prior period
Most-reported subjects
- Other39%43
- Reducing your debt (credit cards, mortgage, student loans)27%29
- Calls pretending to be government, businesses, or family and friends14%15
* 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 2026-07-05.
Which prefixes and exchanges belong to area code 840?
6% assigned to a telco
- 64% Landline
- 36% Wireless
- 0% Unknown
| 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 |
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, 109 unwanted-call complaints were reported to the FTC for numbers showing the 840 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 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, 109 unwanted-call complaints were reported to the FTC for numbers showing the 840 code (74% 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, 109 unwanted-call complaints were reported to the FTC for numbers showing the 840 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 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 2,090,851 residents. No other code overlays this region, so 840 alone identifies the area.
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.