840 area code — Pomona, CA geographic
- State
- California
- Major area
- Pomona
- Time zone
- Pacific
- In service since
- 2021-02-23
- Split from
- 909
- Overlay complex
- 840 / 909
- Active prefixes
- 119
- Rate centers
- 19
- Carriers
- 14
- Projected exhaust
- 1Q 2056
Area code 840 is a geographic code serving Pomona, California in the Pacific time zone. It has been in service since February 23, 2021. Together with 909 it forms the 840/909 overlay. Because of number portability and VoIP, the area code tells you where the number was issued, not where the caller is right now.
NANPA lists 119 active NXX prefixes in 840, assigned to 14 carriers. 119 of those prefixes are pooled — shared between carriers in thousands-number blocks. The code spans 19 rate centers (billing localities).
Its parent code is 909, which it left in 2021.
Official projections put exhaust for the 840/909 complex at 1Q 2056.
The dialing plan is 1+10D for home-NPA local calls and 1+10D across codes.
If a 840 call asks for money or personal data, treat the displayed number as unverified: hang up and reach the organization through its published number. Numbering data locates numbers, not callers.
Largest localities in 840
| Locality (rate center) | Active prefixes | Also served by |
|---|---|---|
| Pomona | 16 | 909 |
| Arrowhead | 14 | 909 |
| Fontana | 12 | 909 |
| San Bernardino | 11 | 909 |
| Chino | 8 | 909 |
| Claremont | 7 | 909 |
| Ontario | 7 | 909 |
| Colton | 6 | 909, 951 |
| Upland | 6 | 909 |
| Redlands | 5 | 909 |
FAQ
Where is a 840 number from?
840 is assigned to Pomona and surrounding areas of California in the Pacific time zone. The three digits after the area code (the prefix) narrow it down to a rate center.
Is 840 a toll-free number?
No. 840 is a geographic code; calls are billed like any other domestic call. Toll-free codes are 800, 833, 844, 855, 866, 877 and 888.
Why do 909 and 840 cover the same place?
They are overlays: when a code runs low on numbers, a new code is added over the same territory instead of splitting it. The 840/909 complex shares one service area, and local calls are dialed with 10 digits.
Will 840 run out of numbers?
NANPA's current forecast projects exhaust in 1Q 2056 — decades of capacity remain.
Why am I getting spam calls from 840 numbers?
Scammers spoof recognizable area codes so calls look local or familiar. A displayed 840 number does not prove the call originated there — see our guide to spotting spoofed calls.