837 area code
Where the 837 area code is, its overlay and how to dial a +1 837 number from anywhere.
The 837 area code is in California, United States (Pacific (PT)). To call from abroad: +1 837 555-0123. It is an overlay, so all 10 digits are dialled.
The 837 area code is a geographic North American Numbering Plan (NANP) code covering California. It has been in service since 08-Jun-2023 and sits in the Pacific (PT) time zone.
How to dial a 837 number
+1 837 555-01231 837 555-0123837 555-0123Other California area codes
Frequently asked questions
Where is the 837 area code?
The 837 area code is in California, United States (Pacific (PT)).
Is 837 an overlay area code?
Yes. 837 overlays the same region as 530, so callers dial all 10 digits.
Do I have to dial 10 digits for 837?
Yes — dial the area code plus the seven-digit number.
How do I call a 837 number from another country?
Dial your exit code (or +), then 1, then 837, then the number: +1 837 555-0123.
Source: NANPA numbering plan. An area code covers a region, not a precise address — a 837 number does not pinpoint a street or ZIP code.
Number holders in area code 837
Each prefix (the three digits after the area code) is assigned by NANPA to one telephone company. 22 prefixes are in use in 837, shared by 5 companies. The largest holders:
| Company | Prefixes | Share |
|---|---|---|
| Multiple Ocn Listing | 14 | 64% |
| Onvoy, LLC | 3 | 14% |
| Exiant Communications LLC | 2 | 9% |
| Wide Voice, LLC | 2 | 9% |
| Opentact Inc. | 1 | 5% |
Source: NANPA central office code assignments. A number keeps its original prefix when it is ported to another carrier.
All US area codes United States +1 Map of area code 837 — cities & rate centres