Mariposa (formerly Logtown) is a census-designated place (CDP) in and the county seat of Mariposa County, California, United States. The population was 2,173 at the 2010 census, up from 1,373 at the 2000 census. Its name is Spanish for "butterfly", after the flocks of Monarchs seen overwintering there by early explorers.
Mariposa is located at 37°29′06″N 119°57′59″W / 37.485°N 119.96639°W / 37.485; -119.96639, at 1,949 feet (594 m) in elevation. It lies in the rugged foothills of the Sierra Nevada. Mariposa Creek flows through the town.
According to the United States Census Bureau, the CDP has a total area of 12.9 square miles (33.4 km²), all but 0.23% of it land.