Happy Camp (Karuk: athithúf-vuunupma) is a census-designated place (CDP) in Siskiyou County, California, United States. Its population is 905 as of the 2020 census, down from 1,190 from the 2010 census.The town of Happy Camp, "The Heart of the Klamath," is located on State Route 96, about 70 mi west of Interstate 5