Where Is Humboldt County Located?

Humboldt County is located on the rugged North Coast of California, approximately 270 miles (435 km) north of San Francisco.

Geographic Boundaries

• North: Del Norte County (OR border 30 mi).
• East: Siskiyou & Trinity Counties (Klamath Mountains).
• South: Mendocino County.
• West: Pacific Ocean (110 mi coastline).

Key Features

• Humboldt Bay — California's second-largest natural bay; Eureka (county seat) & Arcata on its shores.
• Redwood National & State Parks — 45% of remaining old-growth coast redwoods.
• Trinity Alps, King Range (Lost Coast) — wilderness, backpacking.
• Climate: Cool, foggy, wet (40–80″ rain); temperate rainforest.

Major Towns

• Eureka (26k) — Victorian seaport, Carson Mansion.
• Arcata (18k) — Humboldt State Univ, plaza, marsh sanctuary.
• Fortuna (12k) — gateway to redwoods.
• McKinleyville, Trinidad, Blue Lake, Ferndale (historic Victorian village).

Access

• Air: Arcata-Eureka (ACV) — flights to SFO, LAX, DEN, PDX.
• Road: US-101 (Redwood Highway) — scenic, landslide-prone.
• Rail: None (NWP Railroad defunct).

Humboldt is iconic for redwoods, cannabis culture, environmental activism, and isolation.