California, United States
Pacific Time
12:14 AM
Area Code
837
State / Province
California
Country
United States
Time Zone
Pacific Time
City data unavailable for this area code.
Use the E.164 format for clickable phone links (RFC 3966):
<a href="tel:+18375550100">+18375550100</a><a href="tel:+18375550199">+18375550199</a>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 42 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.
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.