The 909 area code serves the Inland Empire of Southern California, including San Bernardino, Ontario, Pomona, and Rancho Cucamonga. In service since 1992, 909 covers the fast-growing communities east of Los Angeles County. If a 909 number has appeared on your caller ID, this guide explains where it comes from, how to dial it, and how to stay safe from spoofed calls.
Quick Summary: Area Code 909 at a Glance
| Detail | Information |
|---|---|
| Area Code | 909 |
| State | California (CA) |
| Major Cities | San Bernardino, Ontario, Pomona, Rancho Cucamonga |
| Time Zone | Pacific Time (PT) |
| Country Code | +1 (USA) |
| Overlay Codes | 840 |
Geographic Coverage & Major Cities
Area code 909 covers the western portion of San Bernardino County and the eastern edge of Los Angeles County, at the heart of the Inland Empire. It shares its territory with the 840 overlay.
Cities and communities served by the 909 area code include:
- San Bernardino — the county seat and a major regional hub
- Ontario and Rancho Cucamonga — logistics, retail, and airport centers
- Pomona and Chino — eastern Los Angeles County communities
- Fontana, Rialto, Upland, and Redlands — growing Inland Empire cities
Because it covers this large and expanding region, a 909 number carries a recognizable Inland Empire identity for residents and businesses.
A Brief History of Area Code 909
Area code 909 was created in 1992, split from 714 to serve the Inland Empire and the eastern San Gabriel Valley. In 2004, the Riverside County portion was moved to the new 951 code, leaving 909 focused on western San Bernardino County and eastern LA County. To add capacity, the 840 overlay was introduced in 2018 across the same territory, bringing mandatory 10-digit dialing.
Time Zone & Best Time to Call
Numbers in the 909 area code use Pacific Time (PT). The region observes Daylight Saving Time, shifting from PST (UTC−8) to PDT (UTC−7) between March and November each year.
How to Dial Phone Numbers in Area Code 909
Because of the 840 overlay, the region requires 10-digit dialing on every call.
Calling within the United States or Canada
- 10-digit dialing: Always include the area code — 909-XXX-XXXX.
- 11-digit dialing: You can also dial 1-909-XXX-XXXX; the leading 1 is the NANP country code.
Calling from outside the United States
- Format: [exit code] + 1 + 909 + XXX + XXXX
- From the UK, Europe, or most of Asia/Africa: 00 1 909 XXX XXXX
- From any mobile phone worldwide: +1 909 XXX XXXX
Is Area Code 909 a Scam? Safety & Protection Tips
Area code 909 is a legitimate California area code — a call from it is not fraudulent by default. However, scammers frequently spoof the code, faking the caller ID so their number appears to come from a trusted local Inland Empire line. Neighbor spoofing, which mimics your own number’s first six digits, is especially common.
Common scam tactics linked to this region
| Scam type | What to watch for |
|---|---|
| Government impersonation | Callers posing as the IRS or SSA threatening arrest or fines |
| Utility shut-off threats | Demands for immediate payment to avoid disconnection |
| Auto-warranty robocalls | Recorded warnings that your vehicle warranty is expiring |
| Bank & card fraud alerts | Claims of “suspicious activity” seeking your account details |
How to report, block, and look up 909 callers
- Never share personal or financial details with an unexpected caller, however urgent they sound.
- Block the number using your phone’s built-in call-blocking feature or a reputable call-screening app.
- Look up the number with a trusted reverse phone lookup before returning any call.
- Report it to the FTC at reportfraud.ftc.gov and register at DoNotCall.gov.
Nearby & Related Area Codes in California
Area code 909 borders several other Southern California codes:
- 840 — the overlay that shares the Inland Empire with 909
- 951 — Riverside County (Riverside, Corona, Temecula)
- 626 (San Gabriel Valley) and 714 (Orange County — see our 714 area code guide)
- 213 & 310 — Los Angeles to the west (see our 310 area code guide)
Explore more codes across the state on our California area codes hub, or browse every prefix in our US area codes directory.
↑ See the complete list of All US Area Codes by State – every area code across all 50 states in one directory.
Explore Neighboring States
Researching area codes just across the state line? Start with these codes in the states that border California:
Frequently Asked Questions About Area Code 909
Where is the 909 area code located?
Area code 909 covers the Inland Empire of Southern California, including San Bernardino, Ontario, Pomona, and Rancho Cucamonga. It operates on Pacific Time and shares its territory with the 840 overlay.
Is 909 a landline or cell phone area code?
Both. Area code 909 serves landlines, mobile phones, and VoIP numbers throughout the western Inland Empire.
What is the difference between 909 and 951?
909 covers western San Bernardino County and eastern LA County, while 951 covers Riverside County. The two split in 2004 as the Inland Empire grew.
Should I answer a call from an unknown 909 number?
If you are not expecting the call, let it go to voicemail. Legitimate callers leave a message, while spoofed or robocall numbers usually will not. Verify any unfamiliar number with a reverse lookup before calling back.
Related 909 Guides
- Is a 909 call safe? Read Is area code 909 a scam? Spam & safety guide.
- Worried about spam or robocalls? Browse our Scam Alerts directory.