Lake Havasu City is a city in Mohave County, Arizona, United States. As of the 2020 census, the population of the city was 57,144, up from 52,527 in 2010. It is served by Lake Havasu City Airport. The community first started during World War II as Site Six, an Army Air Corps rest camp on the shores of Lake Havasu. In 1958, American businessman Robert P. McCulloch purchased 3,353 acres of property on the east side of the lake along Pittsburgh Point, a peninsula that would eventually be transformed into an island.