Waukesha County, Wisconsin

Waukesha County, Wisconsin
County
Waukesha County Courthouse
Flag Seal
Motto:  "Leading the way!"
Map of Wisconsin showing Waukesha County
Wisconsin's location in the contiguous United States
Country	United States
State	Wisconsin
Incorporated	1846
County seat	Waukesha
Largest city	Waukesha
Area
• Total	581 sq mi (1,500 km2)
• Land	550 sq mi (1,400 km2)
• Water	31 sq mi (80 km2)
Population  (2020)[1]
• Total	406,978
• Estimate  (2021)	408,756
• Rank	3rd largest county in Wisconsin
• Density	740.3/sq mi (285.8/km2)
Time zone	UTC−6 (Central)
• Summer (DST)	UTC−5 (Central)
Area codes	262, 414
Congressional districts	1st, 5th
Interstates
U.S. Routes
State Routes
Airports	Waukesha County Airport Capitol Airport
Website	www.waukeshacounty.gov

Waukesha County (/ˈwɔːkɪʃɔː/) is a county in the U.S. state of Wisconsin. As of the 2020 United States Census, the population was 406,978, making it the third-most populous county in Wisconsin. Its median income of $88,985 placed it as the only county in Wisconsin on the list of the 100 highest-income counties in the U.S. by median income as of 2020.^[2] Its county seat and largest city is Waukesha.^[3]

Waukesha County is included in the Milwaukee–Waukesha–West Allis, WI Metropolitan Statistical Area.