Town · Wisconsin
Town of Sumner, Jefferson County, Wisconsin
Sumner (town), Jefferson County, town, in Jefferson County, Wisconsin. Sumner (town), Jefferson County had 829 residents on July 1, 2025 by the Census Bureau's estimate, down 2.0% since 2020; the 2020 Census counted 846 and the ACS 2020-2024 5-year estimates put it at 824 (±122). GEOID 5505578475.
Residents, July 2025 estimate
829
Census Bureau estimate (no margin published)
2020 Census count: 846 · ACS 2020-2024: 824 ±122
Median household income
$86,429
±$21,418 (90% margin)
Wisconsin: $77,485
Median home value
$328,600
±$37,295 (90% margin)
Wisconsin: $266,500
Median gross rent
$1,330
±$103 (90% margin)
Wisconsin: $1,087
Where is Sumner (town), Jefferson County and what county is it in?
Sumner (town), Jefferson County is a town in Jefferson County, Wisconsin. It covers 16.3 square miles of land, 52 residents per square mile in 2020.
One place lies inside the Town of Sumner (Jefferson County): Lake Koshkonong (CDP, 1,239 in 2020).
Sumner (town), Jefferson County is in the Watertown-Fort Atkinson, WI micropolitan statistical area (Census Bureau delineation, July 2023).
Source: 2024 Gazetteer and 2020 place-by-county files, U.S. Census Bureau · Census reference files
How many people live in Sumner (town), Jefferson County, and is it growing?
The Census Bureau estimates that 829 people lived in Sumner (town), Jefferson County on July 1, 2025, down 2.0% since 2020, while Wisconsin grew 1.3%. The 2020 Census counted 846 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 824 (±122).
| Measure | Sumner (town), Jefferson County | Jefferson County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 824±122 | 86,003 | no clear change |
| Households | 374±54 | 34,873 | no clear change |
| Average household size | 2.20±0.23 | 2.37 | no clear change |
| Housing units | 516±62 | 36,890 | no clear change |
Sumner (town), Jefferson County's population since 2000
From 904 in 2000 to 829 in 2025: down 8.3%. The 2000, 2010 and 2020 figures are census counts, each for Sumner (town), Jefferson County as it was drawn that year: a place that annexed land, or a community that has since incorporated, covered a different area then. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); Census PEP Vintage 2025 (SUB-EST2025, CO-EST2025); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in Sumner (town), Jefferson County?
The median resident of Sumner (town), Jefferson County is 56.9 years old; 12.4% are under 18 and 31.7% are 65 or older. The largest group is non-Hispanic white residents at 95.8%, then non-Hispanic Black residents at 1.1%.
| Measure | Sumner (town), Jefferson County | Jefferson County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 56.9±2.8 | 41.5 | no clear change |
| Under 18 years | 12.4%±4.3 pts | 19.7% | – |
| 65 years and over | 31.7%±5.9 pts | 18.5% | – |
| Male | 56.9%±4.2 pts | 50.0% | – |
| Hispanic or Latino (any race) | 1.0%±1.6 pts | 8.5% | – |
| White alone, not Hispanic | 95.8%±3.1 pts | 87.0% | no clear change |
| Black or African American alone, not Hispanic | 1.1%±1.8 pts | 0.9% | – |
| Asian alone, not Hispanic | 0.6%±0.8 pts | 0.6% | – |
| American Indian and Alaska Native alone, not Hispanic | 0.0%±2.7 pts | 0.1% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±2.7 pts | 0.0% | – |
| Two or more races, not Hispanic | 1.1%±1.4 pts | 2.7% | – |
| Some other race alone, not Hispanic | 0.5%±1.0 pts | 0.3% | – |
| Born outside the United States | 0.7%±0.8 pts | 3.7% | – |
| Speak a language other than English at home (age 5+) | 1.0%±1.3 pts | 6.3% | – |
| Civilian veterans (age 18+) | 5.8%±2.8 pts | 6.4% | – |
| With a disability | 13.3%±4.1 pts | 12.8% | – |
| No health insurance coverage | 3.9%±4.9 pts | 4.8% | – |
| High school graduate or higher (age 25+) | 93.1%±4.5 pts | 92.9% | – |
| Bachelor's degree or higher (age 25+) | 15.5%±5.1 pts | 28.5% | −8.0 pts |
| Graduate or professional degree (age 25+) | 5.1%±2.6 pts | 8.9% | – |
| Lived in the same house a year earlier | 95.4%±3.4 pts | 90.3% | – |
| Moved from another state in the past year | 2.3%±2.8 pts | 1.2% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Sumner (town), Jefferson County earn?
Half of Sumner (town), Jefferson County's 374 households earn less than $86,429 a year (±$21,418), against $83,750 in Jefferson County and $77,485 in Wisconsin. In 2015-2019 it was $81,226 in 2024 dollars; the margins of error cannot tell the two periods apart. 7.2% of residents live below the poverty line.
| Measure | Sumner (town), Jefferson County | Jefferson County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $86,429±$21,418 | $83,750 | no clear change |
| Mean household income | $125,628±$26,116 | $100,082 | – |
| Per capita income | $55,308±$11,297 | $41,881 | no clear change |
| People below the poverty line | 7.2%±3.7 pts | 8.1% | no clear change |
| Children under 18 below the poverty line | 7.8%±14.0 pts | 9.8% | – |
| Households receiving SNAP | 7.8%±7.9 pts | 9.2% | – |
| Households with a computer | 93.9%±3.3 pts | 94.6% | – |
| Households with a broadband subscription | 93.6%±3.3 pts | 90.6% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Sumner (town), Jefferson County?
Owners occupy 90.9% of Sumner (town), Jefferson County's occupied homes and renters 9.1%. The median owner-occupied home is valued at $328,600 by its owner (±$37,295). The median renter pays $1,330 a month including utilities, and 50.0% of renters pay 35% or more of their income on rent.
| Measure | Sumner (town), Jefferson County | Jefferson County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $328,600±$37,295 | $274,100 | no clear change |
| Median gross rent | $1,330±$103 | $1,035 | no clear change |
| Renters paying 35% or more of income on rent | 50.0%±30.4 pts | 30.0% | – |
| Median monthly owner costs, with a mortgage | $1,675±$278 | $1,730 | – |
| Owner-occupied homes | 90.9%±5.1 pts | 73.1% | no clear change |
| Renter-occupied homes | 9.1%±5.1 pts | 26.9% | – |
| Housing units | 516±62 | 36,890 | no clear change |
| Homeowner vacancy rate | 0.0%±6.4 pts | 0.2% | – |
| Rental vacancy rate | 0.0%±42.3 pts | 4.5% | – |
| Single-family detached homes | 98.1%±1.6 pts | 71.6% | – |
| Mobile homes | 0.6%±0.8 pts | 3.6% | – |
| Built 2020 or later | 1.7%±1.8 pts | 1.1% | – |
| Built 2010 to 2019 | 4.5%±3.1 pts | 5.4% | – |
| Built 1939 or earlier | 32.6%±7.2 pts | 24.3% | – |
| Households with no vehicle | 0.0%±5.8 pts | 4.6% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How do people in Sumner (town), Jefferson County work and get to work?
65.8% of Sumner (town), Jefferson County's workers drive alone and 18.4% work from home. The average trip to work takes 26.4 minutes.
| Measure | Sumner (town), Jefferson County | Jefferson County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 55.6%±7.5 pts | 68.3% | – |
| Unemployment rate | 1.0%±1.0 pts | 3.6% | – |
| Drove alone to work | 65.8%±10.1 pts | 76.9% | – |
| Carpooled | 14.1%±8.0 pts | 8.1% | – |
| Public transportation | 0.0%±5.3 pts | 0.4% | – |
| Walked | 0.7%±1.3 pts | 3.0% | – |
| Worked from home | 18.4%±10.8 pts | 10.5% | +12.1 pts |
| Mean travel time to work | 26.4 min±2.3 | 24.8 min | no clear change |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What census tracts are in Sumner (town), Jefferson County?
No census tract lies mostly in Sumner (town), Jefferson County; 2 tracts reach into it (2020 census blocks).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 1012.01Jefferson County | 2,123 | $98,456 |
| Tract 1013Jefferson County | 6,108 | $80,792 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 block assignment files (tract share = share of the tract's census blocks in Sumner (town), Jefferson County) · Census block assignment files
How does Sumner (town), Jefferson County compare with other places in Wisconsin?
By the Census Bureau's July 2025 estimates, Sumner (town), Jefferson County is the 8,379th-most populous of the 16,079 U.S. towns and townships that have one and the 656th-most populous of 1,239 in Wisconsin.
Sumner (town), Jefferson County is not ranked by income or the other survey measures: those rankings include places of 1,000 or more residents (2020 Census) with a reliable estimate.
| Measure | Rank | Of |
|---|---|---|
| Population, July 2025 estimate | 656th | 1,239 |
Sumner (town), Jefferson County's figures with every place in Wisconsin (CSV)
Every place in Wisconsin, sortable · Compare Sumner (town), Jefferson County with other places
Source: PlainCities ranks computed from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How reliable are the figures for Sumner (town), Jefferson County?
22 of the 57 figures for Sumner (town), Jefferson County on this page carry a coefficient of variation over 40% and are marked with a ring: they come from a small sample, so read them as rough.
The American Community Survey samples about one household in eight over five years, so every figure is an estimate with a 90% margin of error (shown under each value). A ring marks an estimate whose coefficient of variation is over 40%. A change is called only when the gap between the two periods is larger than their combined 90% margin (the square root of the sum of the two squared margins), the Census Bureau's test. How to read a margin of error.
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026): margins of error as published · ACS technical documentation
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Sumner (town), Jefferson County are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' school search.