Running Springs is a census-designated place (CDP) in San Bernardino County, California, United States. The population was 4,862 at the 2010 census, down from 5,125 at the 2000 census.HistoryRunning Springs was originally known as Hunsaker Flats, named for Abraham Hunsaker, an early member of a Mormon Battalion. The area was developed after improvements to the state highways in the 1920s.GeographyRunning Springs is located at .According to the United States Census Bureau, the CDP has a total area of 4.2 square miles, 99.79% of it is land and 0.21% is water.Demographics2010The 2010 United States Census reported that Running Springs had a population of 4,862. The population density was 1,154.0 people per square mile (445.6/kmĀ²). The racial makeup of Running Springs was 4,325 (89.0%) White (79.8% Non-Hispanic White), 23 (0.5%) African American, 47 (1.0%) Native American, 50 (1.0%) Asian, 6 (0.1%) Pacific Islander, 146 (3.0%) from other races, and 265 (5.5%) from two or more races. Hispanic or Latino of any race were 695 persons (14.3%).