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is a city in La Crosse County, Wisconsin, and the largest suburb of the city of La Crosse. The population was 14,839 at the 2000 census. Its estimated 2007 population was 16,644. The city borders La Crosse directly to the north and three unincorporated rural towns: Onalaska, Medary, and Hamilton.
Onalaska is built on a slightly elevated ridge above the Black River. Natural areas include river bottomland as well as high, heavily wooded, scenic bluffs. A manmade reservoir at the city's western edge is known as Lake Onalaska. Onalaska is known as "The Sunfish Capital of the World."
The original village (now city) was platted by Thomas G. Rowe (New York) and John C. Laird (Pennsylvania) in 1851. In its early days, lumbering and related industries served as a basis for its economy.