Winterhaven is a census-designated place (CDP) in Imperial County, California. Winterhaven is 6.5 miles (10 km) east of Pilot Knob, The population was 394 at the 2010 census, down from 529 at the 2000 census. It is part of the El Centro, CA Metropolitan Area. North of Interstate 8 and bordering Yuma, Arizona, the town is partly in the Fort Yuma Indian Reservation. The Colorado River marks the town's southern border.

Imperial County is a county located on the southeast border of the U.S. state of California. As of the 2020 census, the population was 179,702, making it the least populous county in Southern California. The county seat and largest city is El Centro. Imperial is the most recent California county to be established, as it was created in 1907 out of portions of San Diego County.