Jacumba (pronounced "ha-COOM-ba") is a census-designated place in the Mountain Empire area of southeastern San Diego County, California. It was treated as a census-designated place (CDP) for the first time in the 2010 census, when it had a population of 561. The ZIP code is 91934 and the town lies within area code 619. The National Geographic Names Database lists its elevation as 2,829 feet (862 m) above mean sea level (AMSL).
Jacumba is located at (32.617N, 116.188W).
The town is in a valley in the Jacumba Mountains at an altitude of 2,800 feet (850 m). The area is dry with an annual average rainfall of 11.8 inches (300 mm). It is served by Old Highway 80; Interstate 8 bypasses the town at a distance of two miles (3 km). The town is located in the Pacific time zone (GMT -08:00).