The Social Security Directory
Independent guide built from public SSA data. Not affiliated with the Social Security Administration. Apply, appeal and check your case only on ssa.gov.

Home › California › San Mateo › 800 South Claremont St

Social Security field office · code 967

San Mateo, CA Social Security Office

The Social Security office in San Mateo is at 800 South Claremont St, Suite 101, San Mateo, CA 94402. Phone: (866) 726-8193. Hours: Monday to Friday, 9:00 AM - 4:00 PM. If you appeal a disability decision, your hearing goes to the San Francisco hearing office (about 8.9 months on average).

Address, phone and office hours

Address800 South Claremont St, Suite 101
San Mateo, CA 94402
Phone(866) 726-8193
Fax(833) 950-2108
Monday9:00 AM - 4:00 PM
Tuesday9:00 AM - 4:00 PM
Wednesday9:00 AM - 4:00 PM
Thursday9:00 AM - 4:00 PM
Friday9:00 AM - 4:00 PM
Saturday–SundayClosed
SSA office code967

Address, phone and hours from SSA's official field office file. Offices close on federal holidays.

Appealing a disability decision from the San Mateo office

SSA lists the San Mateo field office among the offices served by the San Francisco Hearing Office. That is where an administrative law judge will hear your case if your claim is denied at reconsideration.

Hearing officeSan Francisco, CA(866) 770-1221 Ext. 19111
Average processing time8.9 mo270 days · national 8.6 mo
Approval rate at hearings46%FY 2026 · national 58%

Before the hearing, the medical decision is made by Disability Determination Service Division. Read how to appeal a denial (60-day deadline) and what happens at the hearing.

What you can do at this office

  • Apply for retirement, disability (SSDI), SSI, survivors and spouse benefits. Social Security card applications too.
  • Replace a Social Security card or update your name.
  • Request a reconsideration or a hearing if your claim was denied (forms).
  • Report changes that affect your benefits and get benefit verification letters.

Many of these services can be done online at ssa.gov or by calling 1-800-772-1213. See how to schedule an appointment.

Frequently asked questions

What is the phone number of the San Mateo Social Security office?

The San Mateo, CA Social Security office phone number is (866) 726-8193 and its fax is (833) 950-2108. SSA's national line is 1-800-772-1213.

What are the hours of the San Mateo Social Security office?

Monday to Friday, 9:00 AM - 4:00 PM, according to SSA. It is closed on weekends and federal holidays.

Where is the Social Security office in San Mateo?

800 South Claremont St, Suite 101, San Mateo, CA 94402.

Where are disability appeal hearings held for the San Mateo office?

SSA lists the San Mateo field office among those served by the San Francisco Hearing Office (San Francisco, CA). Its average processing time is about 8.9 months.

Do I need an appointment?

SSA says that if you need in-person help, you must make an appointment to visit a local office. Call the office or 1-800-772-1213 (8:00 a.m. to 7:00 p.m. local time, Monday to Friday). Many services are also available online at ssa.gov.