 The 2010 United States Census reported that Hidden Valley Lake had a population of 5,579.The population density was 564.2 people per square mile (217.9/km²).The racial makeup of Hidden Valley Lake was 4,830 (86.6%) White, 63 (1.1%) African American, 80 (1.4%) Native American, 75 (1.3%) Asian, 12 (0.2%) Pacific Islander, 326 (5.8%) from other races, and 193 (3.5%) from two or more races.