Oconomowoc Lake, Wisconsin Demographics & Population 2026

A note before these figures: with a population of 669, Oconomowoc Lake's ACS estimates come from a small number of survey responses and carry wide margins of error. Individual percentages below — particularly rates that round to 0% or 100% — are approximations, not precise measurements. See data.census.gov for the published margins of error.

Population Overview

Oconomowoc Lake is a small community located in Wisconsin, within Waukesha County. The total population is 669. It ranks as the 473rd most populous out of 808 Census-designated places in Wisconsin.

Age Demographics

The median age in Oconomowoc Lake is 55.1 years. This is 37% higher than the state median of 40.2 years. Only 14.8% of residents are under 18, indicating fewer families with children.

Economy, Income & Housing

The median household income in Oconomowoc Lake is $250,000+. This is 223% higher than the state median of $77,485. It is also 210% higher than the national median of $80,734. The poverty rate stands at 3.6%. This is 66% lower than the state poverty rate of 10.5%. This exceptionally low poverty rate indicates strong economic prosperity across the community. The unemployment rate is 0.9%. This is 71% lower than the state rate of 3.3%. The median home value is $1,210,900. Housing costs are 354% higher than the state median of $266,500. The home-value-to-income ratio is 4.8x. 97.9% of occupied housing units are owner-occupied. This homeownership rate is 44% higher than the state average of 67.8%.

Race & Ethnicity

The largest racial or ethnic group in Oconomowoc Lake is White (non-Hispanic), making up 80.9% of the population. Hispanic or Latino residents account for 4.9%. The Asian population (0.9%) is well below the state average of 2.9%.

Education

72.8% of residents aged 25 and older hold a bachelor's degree or higher. This places Oconomowoc Lake in the top 10% of all cities in the state for educational attainment. This is 118% higher than the state rate of 33.4%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 98.3%. Notably, 38.4% of adults hold a graduate or professional degree, indicating a highly educated workforce.

Data Sources & Methodology

All demographic data for Oconomowoc Lake, Wisconsin is sourced from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates. The ACS collects data from approximately 3.5 million households annually and pools five years of responses so that even small communities can be measured, though the margin of error widens as the population falls. Comparisons are made against Wisconsin state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 808 Census-designated places in Wisconsin. Read more about how these figures are produced on our methodology page, or visit data.census.gov for official data.