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 …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. The ZIP code is 91934 and the town lies within area code 619. Its elevation is 2,829 feet above mean sea level. On February 26, 2013, the United States Board on Geographic Names approved a petition by a citizen committee to change the town's name from Jacumba to Jacumba Hot Springs.