Arcata
- County:
- Humboldt County
- County Seat:
- No
- Area (mi²):
- 9.416
- State:
- California
Arcata is a city located in Humboldt County, California. Arcata has a 2026 population of 18,748. Arcata is currently declining at a rate of -1.48% annually and its population has decreased by -0.47% since the most recent census, which recorded a population of 18,837 in 2020.