626 vs 310
San Gabriel Valley · West LA & South Bay
626
San Gabriel Valley
Region
San Gabriel Valley, eastern Los Angeles County, California
Type
geographic
In service since
1997
Overlay status
Proposed and pending — NANPA filed for an all-services overlay of 626 in February 2025 (CPUC Application A.25-02-004). As of this writing no CPUC decision has been issued, no overlay area code has been assigned, and none is in service. The 2025 application cited a then-current exhaust forecast of Q4 2027; the current forecast may differ (see the numbering data above), and forecasts can shift once a relief proceeding is under way.
310
West LA & South Bay
Region
Western and southern Los Angeles County (Westside, South Bay, Harbor) and Santa Catalina Island, California
Type
geographic
In service since
1991
Overlay status
Active — 424 all-services overlay of the 310 geographic area, effective July 26, 2006 (California's first overlay).
How to read this. We compare only facts that have a source — place, history, and relationship. We deliberately do not score which area code is “better,” “more valuable,” or “more trustworthy”; those are not properties of an area code.
Other comparisons
Facts and dates are cited on each area code's profile (626 · 310); status and in-service data via NumberResearch. How this is made.