Arcata is a city adjacent to the Arcata Bay (northern) portion of Humboldt Bay in Humboldt County, California, United States. Take a look below for 30 fascinating and fun facts about Arcata, California, United States. 1. At the 2020 census, Arcata’s population was 18,857. 2. Arcata was first settled in 1850 as Union, was officially…