what county is waukesha wi
Waukesha County sign on WIS 59. Waukesha County (pronounced WAW-ke-shaw) 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 MilwaukeeâWaukeshaâWest Allis, WI Metropolitan Statistical Area.