California, United States
Pacific Time
10:23 PM
Area Code
837
State / Province
California
Country
United States
Time Zone
Pacific Time
Area code 837 covers 3 cities and communities across California, based on telephone company rate center data.
Use the E.164 format for clickable phone links (RFC 3966):
<a href="tel:+18375550100">+18375550100</a><a href="tel:+18375550199">+18375550199</a>Look up which exchange in California a specific 837 number is homed to, and whether its block is wireline or wireless. See what a reverse lookup can establish before relying on the answer.
3 active prefixes in this area code, assigned as 7 thousands-blocks — pooling splits one prefix across several carriers, so each block is listed separately with the rate centre it is homed to, its carrier of record, and the switch that serves it.
Showing blocks 1–7 of 7
| NPA-NXX | Block | Rate centre | Type | Carrier (OCN) | Switch | LATA | LIR | Dates |
|---|---|---|---|---|---|---|---|---|
| 837-776 | 7 | Redding | Landline or VoIP | ONVOY, LLC - CA (649C) | — | 724 | — | — |
| 837-776 | A | Redding | Landline or VoIP | ONVOY, LLC - CA (649C) | — | 724 | — | — |
| 837-777 | 7 | Truckee | Landline or VoIP | WIDE VOICE, LLC - CA (252F) | — | 726 | — | — |
| 837-777 | 8 | Truckee | Landline or VoIP | WIDE VOICE, LLC - CA (252F) | — | 726 | — | — |
| 837-777 | A | Truckee | Landline or VoIP | WIDE VOICE, LLC - CA (252F) | — | 726 | — | — |
| 837-888 | 8 | Shingle Springs | Landline or VoIP | ONVOY, LLC - CA (649C) | — | 726 | — | — |
| 837-888 | A | Shingle Springs | Landline or VoIP | ONVOY, LLC - CA (649C) | — | 726 | — | — |
Block-level assignments from the North American Numbering Plan administrator, via localcallingguide.com.
Assigned Prefixes
3
Assignment Blocks
7
Rate Centers
3
Carriers of Record
2
| Type | Blocks | Share |
|---|---|---|
| Landline or VoIP | 7 | 100% |
| Carrier | Blocks |
|---|---|
| ONVOY, LLC - CA | 4 |
| WIDE VOICE, LLC - CA | 3 |
Carrier of record for each block. Numbers ported to another carrier keep their original block assignment, so this is not a lookup of who serves a given number today.
| Rate Center | Prefixes | Blocks |
|---|---|---|
| Redding | 1 | 2 |
| Shingle Springs | 1 | 2 |
| Truckee | 1 | 3 |
A rate center is the telephone exchange area a number is homed to. It sets local calling boundaries, and is not the caller's current location.
837 was activated on Jan 31, 2025 as an overlay covering California (Redding, Chico, Davis). It shares the same geography as 530, which means ten-digit dialing is required for local calls in this region — dial the area code even when calling a neighbor.
A new 837 number does not indicate a different city than 530. Overlays are added when the existing code runs out of available prefixes.
See every North American overlayArea code 837 is a North American Numbering Plan (NANP) telephone area code assigned to California, United States. It is one of 41 area codes serving California. As population and demand for phone numbers grew, the region was divided into multiple numbering plan areas to avoid exhausting the available 7-digit number pool.
Yes. 837 is an active North American Numbering Plan (NANP) area code, currently assigned to California, United States. It is safe to answer or dial calls using this area code.
Area code 837 covers 3 cities and communities in California, including Redding, Shingle Springs, Truckee. This is based on telephone company rate center data — the geographic areas carriers use to determine local calling boundaries and to assign numbers when a business or individual requests a phone number in a specific city.
All numbers in the 837 area code observe Pacific Time (IANA timezone: America/Los_Angeles). Pacific Time is UTC−8 in winter (PST) and UTC−7 in summer (PDT). When placing a call to a 837 number from a different time zone, check the current local time above to avoid calling outside of business hours.
From within California, dial the 7-digit local number directly if calling within the same rate center, or dial 1 + 837 + 7-digit number for long-distance calls within North America. From outside the US or Canada, dial your country's international exit code followed by 1 837 XXX XXXX. The country code for both the United States and Canada in NANP is +1.
Format 837 numbers using E.164 notation as required by RFC 3966: prefix with +1 and omit dashes and parentheses (e.g., +18375550100). This format ensures tel: links work correctly on all mobile browsers and VoIP apps. See the tel: URI formatting guide for complete examples.