California, United States·17K residents
Bostonia is a neighborhood in San Diego County, California. Parts of it is within the northeastern portion of the city of El Cajon, while its other parts lie within an adjacent unincorporated area. The portion of Bostonia that lies within the unincorporated area is classified as a census-designated place (CDP) by the United States Census Bureau. The population of the CDP was 16,882 at the 2020 census, up from 15,379 at the 2010 census.
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