San Mateo County, CA ZIP Codes & Directory
Complete postal guide for San Mateo County, California. Featuring the official county seat of Redwood City, largest municipality Daly City, and serving 20 incorporated municipal entities.
Municipalities Located in San Mateo County
Incorporated Cities, Towns, and Villages
Atherton
cityZIPs: 94027
Belmont
cityZIPs: 94002
Brisbane
cityZIPs: 94005
Burlingame
cityZIPs: 94010
Daly City
cityZIPs: 94014, 94015
Half Moon Bay
cityZIPs: 94019
La Honda
cityZIPs: 94020
Loma Mar
cityZIPs: 94021
Menlo Park
cityZIPs: 94025
Millbrae
cityZIPs: 94030
Moss Beach
cityZIPs: 94038
Pacifica
cityZIPs: 94044
Pescadero
cityZIPs: 94060
Portola Valley
cityZIPs: 94028
Redwood City
cityZIPs: 94061, 94062 , +2 more
San Bruno
cityZIPs: 94066
San Carlos
cityZIPs: 94070
San Gregorio
cityZIPs: 94074
San Mateo
cityZIPs: 94401, 94402 , +2 more
South San Francisco
cityZIPs: 94080
Active USPS ZIP Codes in San Mateo County
Standard delivery zones and geographic service boundaries
Frequently Asked Questions About San Mateo County, CA
What is the county seat and largest city in San Mateo County? ▾
The official county seat of San Mateo County is Redwood City, and its largest incorporated municipality by population is Daly City.
How many cities, towns, and villages are in San Mateo County? ▾
San Mateo County encompasses 20 incorporated municipal entities, including 20 cities, 0 towns, and 0 villages.
What is the total population and land area of San Mateo County? ▾
According to official U.S. Census Bureau data, San Mateo County has a population of approximately 764,442 residents and spans an area of 448 square miles.
How many ZIP codes operate in San Mateo County? ▾
There are 27 active USPS ZIP codes serving addresses within San Mateo County, California.