Oconomowoc Lake is a village in Waukesha County, Wisconsin, United States.

Around the turn of the 20th century, the area become known as a summer retreat for wealthy residents of Milwaukee and Chicago.

The population was 566 at the 2020 census, and has remained one of the wealthiest jurisdictions in the state of Wisconsin.

Train service to Oconomowoc was initiated in the same year, allowing wealthy families from Chicago and Milwaukee to tour "Lake Country" on weekends.

When the hotel closed in 1910, it had lured many well-heeled families to build their own summer homes along the lakefront.

[7] By 1910, prominent homeowners along the lakefront included Philip Armour of Chicago's meatpacking conglomerate, Frederick Pabst of the Pabst brewing family, and Frederick Miller of the Miller Brewing Company.

[1] The incorporation process was made final after going through a number of courts and a resident vote was held.

All GOP candidates for president and governor since the incorporation of the village have carried Oconomowoc Lake with over 70% of the vote.

The best result for a Democratic candidate for president or governor is the 25.06% won by Joe Biden in 2020.