Yucaipa is a city located 10 miles east of San Bernardino, in San Bernardino County, California, United States. The population was 51,367 at the 2010 census, up from 41,207 at the 2000 census. According to San Bernardino County, the projected population in 2012 is 58,187.Yucaipa has the distinction of being the former, longtime home of a large population of Serrano Indians and was also known for being the home base of what is now Stater Bros. Markets.