 The 2010 United States Census reported that Hat Creek had a population of 309.The population density was 6.2 people per square mile (2.4/km²).The racial makeup of Hat Creek was 239 (77.3%) White, 4 (1.3%) African American, 45 (14.6%) Native American, 2 (0.6%) Asian, 4 (1.3%) Pacific Islander, 9 (2.9%) from other races, and 6 (1.9%) from two or more races.