Mohave County is bounded on the west by the Colorado River which separates it from California and Nevada. It is bounded on the north by Utah. The county seat is Kingman, and the largest town is Lake Havasu City home of the London Bridge.

With an area of 13,470 square miles (34,886 kilometers), Mohave County is larger than Maryland, but it has a population density of only about fourteen people per square mile (four people per square kilometer). Ninety percent of the residents identify themselves as Caucasian.

Part of Grand Canyon National Park and the Lake Mead National Recreation Area are located in Mohave County.