Caller ID for
Area code 840
Area code 840 Pomona, California
Area code 840 is one of the newer area codes, added in 2021 to California, with numbers assigned in Pomona, San Bernardino, Fontana and 13 more places. It’s 9:12 PM there now.
- State
- California41 area codes in California
- Time zone
- Pacific9:12 PM there now
- Exchanges
- 12916 places
- Overlay
- 909Same area, 10-digit dialing
- No sign-up
- We never contact the number
- Spam risk included
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Where area code 840 is
Numbers in 840 are assigned to 16 places in 3 counties: San Bernardino County, Los Angeles County and Riverside County.
No single place dominates: Pomona, the largest, has 12% of the exchanges.
- Pomona16
- San Bernardino15
- Fontana12
- Chino9
- Claremont8
- Ontario8
- Upland7
- Colton6
- Redlands5
- Highland5
- Rialto5
- Diamond Bar4
- Calimesa3
- Mentone2
- Big Bear City1
- Crestline1
Phone companies in 840
129 blocks of numbers in 840 are held by 14 phone companies. The most belong to T-Mobile (32), Fractel (26) and Inteliquent (23).
A large share, about 49%, belongs to competitive and internet phone carriers; wireless networks hold 49% and local phone and cable companies 2%.
A block’s holder is the company it was first assigned to; numbers can move to other carriers since.
History and overlays
840 went into service in 2021, added to the area of 909.
909 (since 1992) shares the same area, so a new number there can get any of these codes and local calls are dialed with all 10 digits.
120 new exchanges were assigned since 2021, the latest in October 2026.
Calling 840
It’s 9:12 PM Pacific time in 840 right now.
From elsewhere in the U.S., dial 1, 840 and the 7-digit number; inside the area, all 10 digits too.
Nearby area codes
California has 41 area codes: 209, 213, 279, 310, 323, 341, 350, 357, 369, 408, 415, 424, 442, 510, 530, 559, 562, 619, 626, 628, 650, 657, 661, 669, 707, 714, 738, 747, 760, 805, 818, 820, 831, 837, 840, 858, 909, 916, 925, 949 and 951.
- 951 · Riverside, CA · same area
- 714 · Anaheim, CA · about 29 mi
- 760 · Oceanside, CA · about 30 mi
- 657 · Anaheim, CA · about 30 mi
- 626 · Alhambra, CA · about 31 mi
- 949 · Irvine, CA · about 35 mi
From the North American Numbering Plan Administrator’s area code and exchange records (10/22/2026) and U.S. Census place and county names. Places and companies are where number blocks were assigned, not where anyone lives or which carrier a number uses today.
Map of the 840 area code
Map of the 840 area code around Pomona, San Bernardino and Fontana, California.
Cities on the map
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Questions about 840
Where is area code 840?
In California, covering Pomona, San Bernardino and Fontana and other places across 3 counties.
What time zone is 840 in?
Pacific time. It was 9:12 PM there when this page loaded.
Is 840 an overlay?
Yes. 909 serves the same area, so dial all 10 digits for local calls.
Which phone companies have 840 numbers?
14 companies hold blocks; the most belong to T-Mobile, Fractel and Inteliquent. About 49% of blocks are wireless.
Is 840 running out of numbers?
Not on record. 120 new exchanges have been assigned since 2021.