SSA splits San Mateo's 27 ZIP codes among 7 offices: 12 to the San Mateo Social Security Office, 7 to the Redwood City Social Security Office, 4 to the Daly City Social Security Office, 1 to the Sf Mission Social Security Office, 1 to the Mountain View Social Security Office, 1 to the Hayward Social Security Office and 1 to the Fremont Social Security Office. For 3 of them, the assigned office isn't the closest one, so check your ZIP before you go.
ZIP codes 94002, 94010, 94018, 94019, 94030, 94037, 94038, 94066, 94401, 94402, 94403 and 94404 go to the San Mateo Social Security Office, 800 South Claremont St, Suite 101, San Mateo.
ZIP codes 94025, 94027, 94061, 94062, 94063, 94065 and 94070 go to the Redwood City Social Security Office, 1718 Broadway St, Redwood City.
ZIP codes 94005, 94014, 94044 and 94080 go to the Daly City Social Security Office, 355 Gellert Blvd, Suite 201, Daly City.
ZIP code 94128 goes to the Sf Mission Social Security Office, 3140 16th St, San Francisco.
ZIP code 94301 goes to the Mountain View Social Security Office, 701 N Shoreline Blvd, 1st Floor, Mountain View.
ZIP code 94545 goes to the Hayward Social Security Office, 24301 Southland Dr, Suite 500, Hayward.
ZIP code 94555 goes to the Fremont Social Security Office, 3100 Mowry Ave, Suite 100, Fremont.
Assigned offices from SSA's Office Locator, looked up by ZIP code on October 1, 2026. ZIP codes are those whose area overlaps San Mateo (U.S. Census Bureau, 2020 ZIP Code Tabulation Areas). Distance is straight-line, from the center of the ZIP code to the office.