Loma Linda is a city in San Bernardino County, California, United States, that was incorporated in 1970. The population was 24,791 at the 202…Loma Linda is a city in San Bernardino County, California, United States, that was incorporated in 1970. The population was 24,791 at the 2020 census, up from 23,261 at the 2010 census. The central area of the city was originally known as Mound City, while its eastern half was originally the unincorporated community of Bryn Mawr.