Rosemont is a census-designated place (CDP) in Sacramento County, California, United States. It is part of the Sacramento - Arden-Arcade - Roseville Metropolitan Statistical Area. The population was 22,681 at the 2010 census, down from 22,904 at the 2000 census.GeographyRosemont is located at .According to the United States Census Bureau, the CDP has a total area of 4.3sqmi, all of it land.Demographics2010The 2010 United States Census reported that Rosemont had a population of 22,681. The population density was 5,215.0 people per square mile (2,013.5/km²). The racial makeup of Rosemont was 13,496 (59.5%) White, 2,720 (12.0%) African American, 310 (1.4%) Native American, 2,419 (10.7%) Asian, 134 (0.6%) Pacific Islander, 1,754 (7.7%) from other races, and 1,848 (8.1%) from two or more races. Hispanic or Latino of any race were 4,587 persons (20.2%).