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Social Security Office — San Mateo, CA (San Mateo Ca)
✓ Hours and phone checked against official Social Security Administration data (updated March 9, 2026)
Suite 101, 800 South Claremont St
San Mateo, CA 94402
San Mateo, CA 94402
📞 Office phone: (866) 726-8193
National helpline (for most questions): 1-800-772-1213
Get directions Call this officeOffice hours
| Day | Opens | Closes |
|---|---|---|
| Monday | 9:00 AM | 4:00 PM |
| Tuesday | 9:00 AM | 4:00 PM |
| Wednesday | 9:00 AM | 4:00 PM |
| Thursday | 9:00 AM | 4:00 PM |
| Friday | 9:00 AM | 4:00 PM |
| Saturday – Sunday | Closed | |
Also closed on federal holidays. Lines are usually longest on Mondays and in the first week of the month; arriving well before closing is a good idea.
Before you go
- Appointments: many services now need one. Call the office or the national number first — it can save you a wasted trip.
- Bring photo ID (driver's license or passport) to every visit.
- Replacement card: bring an unexpired photo ID and proof of citizenship (birth certificate or passport). Originals, not photocopies.
- Applying for benefits: bring your birth certificate and recent pay stubs or W-2s if you have them.
- Skip the trip if you can: benefit letters, address changes, and card replacement (in most states) can be done free at ssa.gov.
More help: What to bring · Do you need an appointment? · Replacing a lost card
Other offices near San Mateo
- Antioch Ca, CA — 2508 Verne Roberts Cir, Antioch, CA 94509 · (866) 331-2324
- Concord Ca, CA — Ste 400, 2150 John Glenn Dr, Concord, CA 94520 · (877) 319-6042
- Fremont Ca, CA — Suite 100, 3100 Mowry Ave, Fremont, CA 94538 · (888) 632-7073
- Hayward Ca, CA — Suite 500, 24301 Southland Dr, Hayward, CA 94545 · (866) 964-5054
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