Area code
Area code 837 — California
California · in service since January 31, 2025
Area code 837 covers parts of California. It is an overlay: 530 serves the same area, so neighbors can have different area codes.
Overlay, same area: 530
Local time in California
Spam reports from Sep 23 – Oct 22, 2026
Too few reports for a level #431 of 461
2 FTC complaints
Consumer reports, not verified by the FTC.
See the reports- Time zonePacific Time
- Local calls1 + 10 digits
- Prefixes25 assigned
- Runs out~3Q 2092
- Unwanted call?Block & report
Spam call reports about 837 numbers
Complaints by week
Sep 11 – Oct 22, 2026Show as table
| Week starting | Complaints |
|---|---|
| Sep 7 (3 days) | 0 |
| Sep 14 | 0 |
| Sep 21 | 0 |
| Sep 28 | 0 |
| Oct 5 | 0 |
| Oct 12 | 2 |
| Oct 19 (4 days) | 0 |
Compared with all codes
- Robocalls
- 2 of 2
- Callers with the same code
- 0 of 2
- Rank by complaints
- #431of 461 · bottom tenth (fewest complaints)
- FCC complaints, Oct 2025 – Sep 2026
- 0
What the calls were about
Sep 11 – Oct 22, 2026
| Subject | Complaints | |
|---|---|---|
| Dropped call or no message | 1 | |
| Reducing your debt (credit cards, mortgage, student loans) | 1 |
Where the people who complained live
Fewer than 5 complaints in the archive: not shown.
October 2026 (partial) report · most reported
Consumer reports, not verified by the FTC · source
Source: FTC Do Not Call complaints created Sep 11 – Oct 22, 2026. They are reported by consumers and are not verified by the FTC; caller ID can be spoofed (how we count).
Source: FCC Consumer Complaints data, unwanted calls filed Oct 1, 2025 – Sep 30, 2026, by caller ID; not verified by the FCC.
Area code 837 location and prefixes
| Exchange (NANPA) | Place | County | Prefixes |
|---|---|---|---|
| REDDING | Redding | Shasta County | 2 |
| AUBN MAIN | — | — | 1 |
| CHICO | Chico | Butte County | 1 |
| HOMEWOOD | — | — | 1 |
| HORNBROOK | Hornbrook | Siskiyou County | 1 |
| NEVADACITY | Nevada City | Nevada County | 1 |
| NTAH THCY | — | — | 1 |
| RED BLUFF | Red Bluff | Tehama County | 1 |
| SHINGLESPG | Shingle Springs | El Dorado County | 1 |
| TRUCKEE | Truckee | Nevada County | 1 |
Source: NANPA CO codes of Oct 23, 2026; places: U.S. Census Bureau, matched by DialWhere (how).
NANPA record
- Location
- California
- Assigned by NANPA
- June 8, 2023
- Local dialing
- 1 + 10 digits (NANPA: 1+10D)
- NANPA planning letters
- PL-621
Source: NANPA, NPA database of Oct 24, 2026.
Is 837 running out of numbers?
Previous forecast (October 2025): 2084, moved later by 8 years.
Forecast exhaust year by edition
Source: NANPA NRUF forecast, April 2026 edition.
Who holds 837 prefixes
All five original holders
As listed by NANPA, not today’s carrier.
| Holder (as listed) | Prefixes | |
|---|---|---|
| Multiple Ocn Listing | 14 56% | |
| Onvoy, LLC | 6 24% | |
| Exiant Communications LLC | 2 8% | |
| Wide Voice, LLC | 2 8% | |
| Opentact Inc. | 1 4% |
Source: NANPA CO codes of Oct 23, 2026.
Questions about area code 837
What area code is 837?
A California area code, in service since January 31, 2025.
Where is 837 area code, and what time zone is it in?
California; Pacific Time.
Why am I getting spam calls from 837?
2 FTC complaints from Sep 23 – Oct 22, 2026, most often about debt reduction (not verified by the FTC; caller ID can be spoofed).
Will 837 get a new area code?
NANPA forecasts exhaust in 3Q 2092; no relief planning listed.