Jacumba Hot Springs is an unincorporated community in the Mountain Empire area of southeastern San Diego County, California, United States. For statistical purposes, the United States Census Bureau defined Jacumba as a census-designated place for the first time in the 2010 census, with a population of 561. At the 2020 census, the population decreased to 540. The census definition of the area may not precisely correspond to local understanding of the area with the same name.