Humboldt
- Alderpoint
- Alton
- Arcata
- Bayside
- Bayview
- Benbow
- Berry Glenn
- Big Lagoon
- Blocksburg
- Blue Lake
- Bracut
- Brainard
- Briceland
- Bridgeville
- Bull Creek
- Burlington
- Cain Rock
- Calville
- Capetown
- Carlotta
- Clam Beach
- Cooks Valley
- Crannell
- Cutten
- Dinsmore
- Elk River
- Englewood
- Ettersburg
- Eureka
- Fairhaven
- Fernbridge
- Ferndale
- Fernwood
- Fieldbrook
- Fields Landing
- Fort Seward
- Fortuna
- Freshwater
- Fruitland
- Garberville
- Hacketsville
- Holmes
- Honeydew
- Hookton
- Hoopa
- Humboldt Hill
- Hydesville
- Indianola
- Johnsons
- King Salmon
- Kneeland
- Korblex
- Larabee
- Loleta
- Manila
- Maple Creek
- Maple Grove
- McCann
- McKinleyville
- Miranda
- Moonstone
- Myers Flat
- Myrtletown
- Newburg
- Orick
- Orleans
- Patricks Point
- Pecwan
- Pepperwood
- Petrolia
- Phillipsville
- Pine Hills
- Port Kenyon
- Redcrest
- Redway
- Ridgewoods Heights
- Rio Dell
- Riverside Park
- Rohnerville
- Samoa
- Scotia
- Shelter Cove
- Shively
- Spruce Point
- Stafford
- Steelhead
- Stone
- Sunny Brae
- Trinidad
- Tyee City
- Waseck
- Weitchpec
- Weott
- Westhaven
- Westhaven-Moonstone
- Whitethorn
- Whitlow
- Willow Creek
- Worswick