Campo (Spanish for "Field") 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 has defined Campo as a census-designated place (CDP).

It was home to a veterans' convalescent hospital, a 300-bed Italian prisoner-of-war camp in Cameron Corners and an all African-American Buffalo Soldiers Cavalry unit which patrolled the border on horseback until 1944.

[6] The United States Military continues to maintain activities nearby at La Posta Mountain Warfare Training Facility.

Nearby communities include Boulevard, Potrero, Tecate, Dulzura, Jacumba, Pine Valley, Mount Laguna, Descanso, and Jamul.

According to the United States Census Bureau, the CDP covers an area of 23.5 square miles (60.7 km2), 99.97% of it land, and 0.03% of it water.

[6] Campo has a hot-summer Mediterranean climate (Csa) with hot, dry summers and cool, relatively wet winters.

[26] A Southern California Automobile Association map, believed to be c. 1910–1930, shows a business named "Dewey Store" in Cameron Corners.

Large employers in the area include US Department of Homeland Security Border Patrol[6][28] and the San Diego County, California Probation, Juvenile Ranch Facility, (population 250).

On the topographic map, it measures about 0.6 miles (970 m) in length and runs almost due north–south at the intersection of Lake Morena Drive and Hauser Creek Road.

The town is along the line of the former Southern Pacific (originally the San Diego and Arizona Railway).

The eastern portion of the reservation is about 4.75 miles (7.64 km) in an east–west dimension and includes the community of Live Oak Springs.

The schools are: About 1.3 miles (2.1 km) north in Cameron Corners, Campo Elementary (K-6) is located at 1654 Buckman Springs Rd.