Cities and towns

• Eureka
• Arcata
• Fortuna
• Rio Dell
• Ferndale
• Blue Lake
• Trinidad

Unincorporated communities

• Alderpoint
• Bayview
• Benbow
• Big Lagoon
• Cutten
• Fairhaven
• Fieldbrook
• Fields Landing
• Garberville
• Hoopa
• Humboldt Hill
• Hydesville
• Indianola
• Kep'el
• Loleta
• Manila
• McKinleyville
• Miranda
• Myers Flat
• Myrtletown
• Orick
• Phillipsville
• Pine Hills
• Redcrest
• Redway
• Samoa
• Scotia
• Shelter Cove
• Wautec
• Weitchpec
• Weott
• Westhaven-Moonstone
• Willow Creek