Waukesha County (WOK-ush-aww) is a county in the U.S. state of Wisconsin. As of the 2010 census, the population was 389,891, making it the third-most populous county in Wisconsin. Its county seat is Waukesha. Waukesha County is included in the Milwaukee–Waukesha–West Allis, WI Metropolitan Statistical Area
Waukesha is a brand of large stationary reciprocating engines produced by INNIO Waukesha Gas Engines, a business unit of the INNIO Group. For 62 years, Waukesha was an independent supplier of gasoline engines, diesel engines, multifuel engines (gasoline/kerosene/ethanol), and LNG/propane engines to many truck, tractor, heavy equipment, automobile, boat, ship, and engine-generator manufacturers.