What to know about ZIP 94128
ZIP code 94128 covers South San Francisco, CA in San Mateo County.
It sits in telephone area code 650; U.S. House district CA-15; the SAN FRANCISCO - OAK - SAN JOSE media market.
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South San Francisco city, CA
ZIP Code 94128 — South San Francisco city, CA Demographics & Data
Source: U.S. Census Bureau ACS 2019–2023 5-Year Estimates. Page data updated 2026-08-02.
Low Snow Area
Map, Quick Facts & Location
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At a glance
Overview of ZIP Code 94128
Climate risk and migration signals
FEMA’s National Risk Index rates natural-hazard risk for South San Francisco city, CA as Relatively High (composite score 99.2), which is among the highest nationally. The strongest component scores on US5 are flood (98.4) and wildfire (92.0). These scores are county-linked NRI values published for planning context — all ZIP codes in the same county share the same composite score on US5. Useful when comparing insurance and disaster exposure across areas, not a substitute for a parcel-level flood or fire determination.
Climate normals for South San Francisco city, CA show little to no average snow and around 19.6 inches of annual precipitation.
Nearby (from this ZIP)
Airport SFO (0.8 miles (1.2 km)) · Skyline College (4.5 miles (7.2 km)) · Presidio of San Francisco (12.6 miles (20.3 km)) · VA: San Bruno VA Outpatient Clinic (2.3 miles (3.6 km))
Full lists and map pins are in the Infrastructure section below.