Humboldt County, California

Humboldt County profile, demographic data, and geographic information.

Local Government & Public Administration

Authoritative general-purpose local government units serving this area U.S. Census Bureau GUS (2026) / GMAF

Government Unit	Unit Type	Jurisdiction Role	Contact / Address
COUNTY OF HUMBOLDT GUS Population: 132,380 (2024) ID: 161099	County	Official County Government	Contact: SENIOR ADMINISTRATIVE ANALYST TRAINE 825 5TH ST, RM 111, EUREKA CA 95501-1169
CITY OF EUREKA GUS Population: 25,412 (2024) ID: 161150	Municipal	Municipal Government Within County	Contact: CITY CLERK 531 K ST, EUREKA CA 95501-1165
CITY OF ARCATA GUS Population: 18,748 (2024) ID: 123103	Municipal	Municipal Government Within County	Contact: CITY MANAGER 736 F ST, ARCATA CA 95521-6284
CITY OF FORTUNA GUS Population: 12,114 (2024) ID: 225041	Municipal	Municipal Government Within County	Contact: CITY MANAGER 621 11TH ST, FORTUNA CA 95540-2346
CITY OF RIO DELL GUS Population: 3,259 (2024) ID: 161152	Municipal	Municipal Government Within County	Contact: MAYOR 675 WILDWOOD AVENUE, RIO DELL CA 95562
CITY OF FERNDALE GUS Population: 1,361 (2024) ID: 203967	Municipal	Municipal Government Within County	Contact: FINANCE PO BOX 1095, FERNDALE CA 95536
CITY OF BLUE LAKE GUS Population: 1,159 (2024) ID: 161149	Municipal	Municipal Government Within County	Contact: MAYOR PO BOX 458, BLUE LAKE CA 95525-0458
CITY OF TRINIDAD GUS Population: 321 (2024) ID: 161151	Municipal	Municipal Government Within County	Contact: CITY CLERK PO BOX 390, TRINIDAD CA 95570-0390