Oconomowoc, Wisconsin demographics

Oconomowoc, WI demographics: median age 42.6; 48.4% of adults 25+ hold a bachelor’s degree. Age, race, households, languages and education, ACS 2020–2024 with margins of error.

ACS 2020–2024 · Oconomowoc city, Wisconsin · Incorporated city · GEOID 5559250. The survey estimates a population of 19,080 for its five-year window. This is separate from the annual July 2025 population estimate on the city overview.

Median age in Oconomowoc is 42.6 years, with a 90% margin of error of 2.6 years. There are 7,833 households (±252). Age and household distributions show how these totals are composed; they do not establish which neighborhood suits a particular person.

Every count and share is an estimate. “±” is a 90% margin of error (MOE); pp means percentage points. Derived shares use the category count divided by the named universe. Aggregated category MOEs and percentage MOEs are approximate. A margin larger than half its estimate is flagged as low precision. Blank source uncertainty is shown as unavailable, never zero.

Age distribution and sex

City, state and U.S. estimates · ACS 2020–2024
Measure / survey universe	City estimate ± MOE	State estimate ± MOE	U.S. estimate ± MOE
Median age Total population · years	42.6 ±2.6	40.2 ±0.1	38.9 ±0.1

Age groups · B01001 · ACS 2020–2024 Total population: 19,080
Category	Count ± MOE	Share ± MOE (pp)	Wisconsin	U.S.
Under 18	3,957 ±461	20.7% ±2.4 pp	21.4%	22.0%
18–34	3,738 ±483	19.6% ±2.5 pp	21.9%	22.8%
35–64	7,582 ±601	39.7% ±3.1 pp	38.2%	38.0%
65 and older	3,803 ±471	19.9% ±2.5 pp	18.5%	17.2%

Sex categories as published by ACS · B01001 · ACS 2020–2024 Total population: 19,080
Category	Count ± MOE	Share ± MOE (pp)	Wisconsin	U.S.
Male	9,110 ±357	47.7% ±1.9 pp	50.1%	49.5%
Female	9,970 ±356	52.3% ±1.9 pp	49.9%	50.5%

The age groups are mutually exclusive and cover the entire population. The sex categories follow this ACS table’s published classification; they are not a survey of gender identity.

Race and Hispanic origin

Race · B02001 · ACS 2020–2024 Total population: 19,080
Category	Count ± MOE	Share ± MOE (pp)	Wisconsin	U.S.
White alone	18,288 ±284	95.8% ±1.5 pp	80.1%	61.0%
Black or African American alone	50 ±32 · low precision	0.3% ±0.2 pp · low precision	6.1%	12.2%
American Indian and Alaska Native alone	46 ±40 · low precision	0.2% ±0.2 pp · low precision	0.8%	0.9%
Asian alone	80 ±82 · low precision	0.4% ±0.4 pp · low precision	3.0%	6.0%
Native Hawaiian and Other Pacific Islander alone	15 ±25 · low precision	0.1% ±0.1 pp · low precision	0.0%	0.2%
Some other race alone	43 ±37 · low precision	0.2% ±0.2 pp · low precision	2.5%	7.1%
Two or more races	558 ±250	2.9% ±1.3 pp	7.6%	12.6%

Hispanic or Latino origin · B03003 · ACS 2020–2024 Total population: 19,080
Category	Count ± MOE	Share ± MOE (pp)	Wisconsin	U.S.
Not Hispanic or Latino	18,394 ±275	96.4% ±1.4 pp	92.0%	80.7%
Hispanic or Latino	686 ±264	3.6% ±1.4 pp	8.0%	19.3%

Hispanic origin and race are separate questions. People of Hispanic or Latino origin may be of any race and appear in both tables. Do not add the Hispanic share to race shares. Race alone and two-or-more-race groups are the mutually exclusive categories of the race table.

Household types, children and living alone

Household types · B11001 · ACS 2020–2024 Households: 7,833
Category	Count ± MOE	Share ± MOE (pp)	Wisconsin	U.S.
Married-couple family	3,973 ±245	50.7% ±2.7 pp	46.8%	46.9%
Other family: male householder, no spouse present	183 ±76	2.3% ±1.0 pp	4.5%	5.1%
Other family: female householder, no spouse present	675 ±148	8.6% ±1.9 pp	9.1%	12.2%
Nonfamily: householder living alone	2,233 ±291	28.5% ±3.6 pp	31.5%	28.7%
Nonfamily: householder not living alone	769 ±235	9.8% ±3.0 pp	8.0%	7.0%

Households with children · B11005 · ACS 2020–2024 Households: 7,833
Category	Count ± MOE	Share ± MOE (pp)	Wisconsin	U.S.
Households with people under 18	2,252 ±221	28.8% ±2.7 pp	26.1%	29.5%
Households without people under 18	5,581 ±369	71.2% ±4.1 pp	73.9%	70.5%

Household size · B11016 · ACS 2020–2024 Households: 7,833
Category	Count ± MOE	Share ± MOE (pp)	Wisconsin	U.S.
One-person nonfamily households	2,233 ±291	28.5% ±3.6 pp	31.5%	28.7%
Two-person households	2,814 ±344	35.9% ±4.2 pp	37.0%	33.8%
Three-person households	1,058 ±197	13.5% ±2.5 pp	13.1%	15.3%
Four-person households	1,350 ±264	17.2% ±3.3 pp	10.9%	12.6%
Five-person households	321 ±113	4.1% ±1.4 pp	4.8%	5.9%
Six-person households	48 ±43 · low precision	0.6% ±0.5 pp · low precision	1.7%	2.2%
Seven or more people	9 ±25 · low precision	0.1% ±0.3 pp · low precision	1.0%	1.4%

A family household contains related people under the Census definition. A nonfamily household can contain one person or unrelated people sharing a home. Households with children can also appear in the household-type and size tables, so those tables must not be added together. Household estimates exclude people living in group quarters from the household universe.

Nativity and languages spoken at home

Nativity · B05002 · ACS 2020–2024 Total population: 19,080
Category	Count ± MOE	Share ± MOE (pp)	Wisconsin	U.S.
Native	18,786 ±136	98.5% ±0.7 pp	94.8%	85.9%
Foreign born	294 ±123	1.5% ±0.6 pp	5.2%	14.1%

Language spoken at home · C16001 · ACS 2020–2024 Population age 5 and older: 18,023
Category	Count ± MOE	Share ± MOE (pp)	Wisconsin	U.S.
English only	17,444 ±374	96.8% ±1.7 pp	91.0%	77.7%
Spanish	188 ±102 · low precision	1.0% ±0.6 pp · low precision	4.9%	13.6%
French, Haitian, or Cajun	0 ±16 · low precision	0.0% ±0.1 pp · low precision	0.2%	0.7%
German or other West Germanic	299 ±261 · low precision	1.7% ±1.4 pp · low precision	0.7%	0.5%
Russian, Polish, or other Slavic	0 ±16 · low precision	0.0% ±0.1 pp · low precision	0.3%	0.7%
Other Indo-European	40 ±77 · low precision	0.2% ±0.4 pp · low precision	0.7%	2.0%
Korean	0 ±16 · low precision	0.0% ±0.1 pp · low precision	0.1%	0.3%
Chinese, including Mandarin and Cantonese	0 ±16 · low precision	0.0% ±0.1 pp · low precision	0.3%	1.1%
Vietnamese	0 ±16 · low precision	0.0% ±0.1 pp · low precision	0.1%	0.5%
Tagalog, including Filipino	0 ±16 · low precision	0.0% ±0.1 pp · low precision	0.1%	0.6%
Other Asian and Pacific Island	47 ±62 · low precision	0.3% ±0.3 pp · low precision	1.2%	1.1%
Arabic	0 ±16 · low precision	0.0% ±0.1 pp · low precision	0.1%	0.5%
Other and unspecified	5 ±8 · low precision	0.0% ±0.0 pp · low precision	0.3%	0.8%

Foreign born means not a U.S. citizen at birth; it includes naturalized citizens. Language categories describe speech at home among people age five and older. A language other than English at home does not establish that someone cannot speak English. This city page uses the published C16001 summary categories because the more detailed B16001 table does not provide these city records in this release.

Educational attainment

Highest completed education · B15003 · ACS 2020–2024 Population age 25 and older: 13,595
Category	Count ± MOE	Share ± MOE (pp)	Wisconsin	U.S.
Less than high school graduate	282 ±113	2.1% ±0.8 pp	6.4%	10.4%
High school graduate or equivalency	2,905 ±412	21.4% ±3.0 pp	29.4%	26.0%
Some college, no degree	2,420 ±377	17.8% ±2.7 pp	19.5%	19.1%
Associate’s degree	1,409 ±276	10.4% ±2.0 pp	11.3%	8.8%
Bachelor’s degree	4,639 ±453	34.1% ±3.2 pp	22.0%	21.6%
Graduate or professional degree	1,940 ±255	14.3% ±1.8 pp	11.4%	14.1%

The denominator excludes residents under 25. Each person is counted in the highest attainment category they completed. This table does not measure the quality of local schools or the education level of every current student.

Residence one year earlier

Geographic mobility · B07003 · ACS 2020–2024 Population age 1 and older: 19,022
Category	Count ± MOE	Share ± MOE (pp)	Wisconsin	U.S.
Same house	16,159 ±615	84.9% ±3.2 pp	88.2%	87.7%
Moved within same county	1,757 ±509	9.2% ±2.7 pp	6.2%	6.3%
Moved from a different county in the same state	722 ±385 · low precision	3.8% ±2.0 pp · low precision	3.3%	3.1%
Moved from a different state	384 ±152	2.0% ±0.8 pp	2.0%	2.3%
Moved from abroad	0 ±16 · low precision	0.0% ±0.1 pp · low precision	0.3%	0.6%

These are respondents’ residence patterns one year before their survey response, pooled across the five-year window. They are not a net migration count for 2025. A person can move to a different house within the same city or county; moves within the same county should not automatically be interpreted as new arrivals to the city.

Health insurance, internet access and veterans

3.7% of Oconomowoc residents (±1.3 percentage points) had no health insurance coverage when surveyed, compared with 5.2% in Wisconsin and 8.4% nationally. 94.7% of households subscribe to broadband of any type, including cellular data plans. A subscription is not the same as available service: the FCC National Broadband Map shows providers at a specific address.

City, state and U.S. shares · ACS 2020–2024
Measure	Oconomowoc	Wisconsin	U.S.	Compared with Wisconsin
People without health insurance Civilian noninstitutionalized population	3.7% ±1.3 pp	5.2%	8.4%	Lower
Households with a broadband subscription Households	94.7% ±4.3 pp	90.3%	91.0%	Higher
Veterans Civilian population age 18 and older	6.3% ±1.8 pp	6.2%	6.2%	Not statistically different

Reading and reusing the estimates

The Census table links above lead to the original detailed tables. Counts, source universes and uncertainty are retained in the source observation download for Oconomowoc . Compare these figures with the same survey window; do not compare one city’s five-year estimate with another city’s annual estimate as though they measured the same period. For methods, see uncertainty and denominator calculations.

Read Oconomowoc housing and cost context or return to the city profile.