Immigration Policy in San Mateo County, CA (2026)
1 rule for unincorporated San Mateo County, California.
Verified from official government sources
Note: These county rules apply to unincorporated areas of San Mateo County. If you live within an incorporated city, that city's own rules apply: see the city list below.
Sanctuary Policy Preemption
County departments and staff are barred from using county resources to assist federal immigration enforcement absent a judicial warrant, under a countywide non-cooperation ordinance.
San Mateo County Immigration Non-Cooperation Law
Significant RestrictionsSan Mateo County Ordinance Code § 2.48.010
All County of San Mateo ("County") departments, agencies, commissions, officers, agents, representatives, and employees are prohibited from using County resources, property, personnel, time, labor, or funds to...hold, detain, house, transfer, or otherwise facilitate the arrest of any person in the custody of the San Mateo County Sheriffs Office, Probation Department, or any other County Departm...
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