Area code lookup
837 area code
- State
- CA
- Codes in state
- 40
- Overlays & neighbours
- 39
- Time zone
- Pacific Time
Quick answer
Area code 837 is a geographic area code assigned to California under the North American Numbering Plan. California observes Pacific Time, and the state also holds 39 other area codes: 209, 213, 279, 310, 323, 341, 350, 369, 408, 415, 424, 442, 510, 530, 559, 562, 619, 626, 628, 650, 657, 661, 669, 707, 714, 747, 760, 805, 818, 820, 831, 840, 858, 909, 916, 925, 935, 949, 951.
Largest cities in California
The largest places in California. Each links to its full local profile: population, income, housing and sales tax.
| City | Population |
|---|---|
| Los Angeles city | 3,857,897 |
| San Diego city | 1,385,061 |
| San Jose city | 990,054 |
| San Francisco city | 836,321 |
| Fresno city | 543,615 |
| Sacramento city | 524,802 |
| Long Beach city | 458,491 |
| Oakland city | 438,072 |
| Bakersfield city | 408,366 |
| Anaheim city | 344,553 |
| Stockton city | 320,470 |
| Riverside city | 316,241 |
All California citiesAll California ZIP codesCalifornia sales tax
Related area codes
Codes that share or border the same calling area.
837 area code FAQ
The questions people ask about this code.
Where is area code 837?
837 is a geographic area code in California.
What time is it in the 837 area code?
837 observes Pacific Time.
Is 837 a scam area code?
No — it is a normal geographic code, not a toll-free or premium-rate prefix. Caller ID can be spoofed on any code, so verify unexpected callers before sharing information.
Sources & transparency
- North American Numbering Plan Administrator (NANPA) area code assignments — area code to geography mapping and overlay relationships
- US Census Bureau, American Community Survey 2019-2023 5-year estimates — city, county and ZIP code geography
Last reviewed August 2026. Figures are published for reference and can change; verify with the source agency before filing or contracting. How we build and check this data.