Town · Wisconsin
Town of Johnstown, Rock County, Wisconsin
Johnstown (town), Rock County, town, in Rock County, Wisconsin. Johnstown (town), Rock County had 768 residents on July 1, 2025 by the Census Bureau's estimate, up 0.0% since 2020; the 2020 Census counted 766 and the ACS 2020-2024 5-year estimates put it at 638 (±95). GEOID 5510538450.
Residents, July 2025 estimate
768
Census Bureau estimate (no margin published)
2020 Census count: 766 · ACS 2020-2024: 638 ±95
Median household income
$84,609
±$10,294 (90% margin)
Wisconsin: $77,485
Median home value
$339,800
±$27,733 (90% margin)
Wisconsin: $266,500
Median gross rent
$1,094
±$198 (90% margin)
Wisconsin: $1,087
Where is Johnstown (town), Rock County and what county is it in?
Johnstown (town), Rock County is a town in Rock County, Wisconsin. It covers 36.0 square miles of land, 21 residents per square mile in 2020.
Johnstown (town), Rock County is in the Janesville-Beloit, WI metropolitan 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 Johnstown (town), Rock County, and is it growing?
The Census Bureau estimates that 768 people lived in Johnstown (town), Rock County on July 1, 2025, about level with 2020, slower than Wisconsin (+1.3%). The 2020 Census counted 766 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 638 (±95).
| Measure | Johnstown (town), Rock County | Rock County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 638±95 | 164,350 | −231 |
| Households | 287±39 | 67,201 | no clear change |
| Average household size | 2.21±0.22 | 2.41 | −0.42 |
| Housing units | 305±40 | 71,109 | −61 |
Johnstown (town), Rock County's population since 2000
From 802 in 2000 to 768 in 2025: down 4.2%. The 2000, 2010 and 2020 figures are census counts, each for Johnstown (town), Rock 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 Johnstown (town), Rock County?
The median resident of Johnstown (town), Rock County is 55.3 years old; 14.1% are under 18 and 23.5% are 65 or older. The largest group is non-Hispanic white residents at 94.2%, then non-Hispanic residents of two or more races at 2.7%.
| Measure | Johnstown (town), Rock County | Rock County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 55.3±3.9 | 40.3 | +6.3 |
| Under 18 years | 14.1%±4.1 pts | 22.4% | – |
| 65 years and over | 23.5%±5.4 pts | 17.8% | – |
| Male | 51.7%±3.5 pts | 49.8% | – |
| Hispanic or Latino (any race) | 1.9%±1.6 pts | 10.1% | – |
| White alone, not Hispanic | 94.2%±3.2 pts | 79.6% | no clear change |
| Black or African American alone, not Hispanic | 0.2%±0.3 pts | 4.6% | – |
| Asian alone, not Hispanic | 0.9%±1.2 pts | 1.1% | – |
| American Indian and Alaska Native alone, not Hispanic | 0.2%±0.3 pts | 0.0% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±3.5 pts | 0.0% | – |
| Two or more races, not Hispanic | 2.7%±2.4 pts | 4.2% | – |
| Some other race alone, not Hispanic | 0.0%±3.5 pts | 0.3% | – |
| Born outside the United States | 0.5%±0.7 pts | 4.6% | – |
| Speak a language other than English at home (age 5+) | 1.5%±1.4 pts | 8.8% | – |
| Civilian veterans (age 18+) | 8.4%±3.5 pts | 6.9% | – |
| With a disability | 11.8%±3.6 pts | 12.8% | – |
| No health insurance coverage | 6.8%±3.6 pts | 5.5% | – |
| High school graduate or higher (age 25+) | 96.4%±2.3 pts | 92.6% | – |
| Bachelor's degree or higher (age 25+) | 24.2%±6.2 pts | 25.8% | no clear change |
| Graduate or professional degree (age 25+) | 6.2%±2.4 pts | 8.1% | – |
| Lived in the same house a year earlier | 97.2%±1.6 pts | 90.6% | – |
| Moved from another state in the past year | 0.3%±0.6 pts | 1.9% | – |
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 Johnstown (town), Rock County earn?
Half of Johnstown (town), Rock County's 287 households earn less than $84,609 a year (±$10,294), against $75,673 in Rock County and $77,485 in Wisconsin. In 2015-2019 the median was $106,007 in 2024 dollars, so it fell by $21,398 after inflation. 5.5% of residents live below the poverty line.
| Measure | Johnstown (town), Rock County | Rock County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $84,609±$10,294 | $75,673 | −$21,398 |
| Mean household income | $120,814±$19,550 | $91,984 | – |
| Per capita income | $54,024±$8,059 | $38,536 | no clear change |
| People below the poverty line | 5.5%±2.9 pts | 9.3% | – |
| Children under 18 below the poverty line | 15.5%±14.1 pts | 12.9% | – |
| Households receiving SNAP | 3.1%±2.7 pts | 12.9% | – |
| Households with a computer | 95.1%±3.2 pts | 95.5% | – |
| Households with a broadband subscription | 86.1%±5.9 pts | 90.3% | – |
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 Johnstown (town), Rock County?
Owners occupy 88.9% of Johnstown (town), Rock County's occupied homes and renters 11.1%. The median owner-occupied home is valued at $339,800 by its owner (±$27,733). The median renter pays $1,094 a month including utilities.
| Measure | Johnstown (town), Rock County | Rock County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $339,800±$27,733 | $231,600 | +$72,739 |
| Median gross rent | $1,094±$198 | $1,037 | no clear change |
| Renters paying 35% or more of income on rent | 7.7%±10.7 pts | 35.0% | – |
| Median monthly owner costs, with a mortgage | $1,654±$115 | $1,538 | – |
| Owner-occupied homes | 88.9%±5.2 pts | 71.2% | no clear change |
| Renter-occupied homes | 11.1%±5.2 pts | 28.8% | – |
| Housing units | 305±40 | 71,109 | −61 |
| Homeowner vacancy rate | 0.0%±8.2 pts | 1.0% | – |
| Rental vacancy rate | 0.0%±43.6 pts | 3.7% | – |
| Single-family detached homes | 95.7%±3.3 pts | 74.4% | – |
| Mobile homes | 0.3%±1.0 pts | 2.6% | – |
| Built 2020 or later | 0.0%±7.1 pts | 1.2% | – |
| Built 2010 to 2019 | 2.6%±1.9 pts | 4.3% | – |
| Built 1939 or earlier | 41.0%±8.0 pts | 19.2% | – |
| Households with no vehicle | 3.5%±2.9 pts | 6.0% | – |
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 many new homes is Johnstown (town), Rock County building?
Builders took permits for 3 new housing units in Johnstown (town), Rock County in 2025 (3 in single-family houses), 3.9 per 1,000 residents against 4.3 across Wisconsin.
Counts of units in permits a local office issued; not every permitted unit is built. A year marked with months was reported for part of the year.
Source: Building Permits Survey, annual place files 2019-2025, U.S. Census Bureau · Census Building Permits Survey
How do people in Johnstown (town), Rock County work and get to work?
84.5% of Johnstown (town), Rock County's workers drive alone and 6.9% work from home. The average trip to work takes 26.6 minutes.
| Measure | Johnstown (town), Rock County | Rock County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 70.2%±6.2 pts | 65.2% | – |
| Unemployment rate | 3.6%±3.0 pts | 3.8% | – |
| Drove alone to work | 84.5%±6.0 pts | 80.1% | – |
| Carpooled | 5.1%±3.8 pts | 7.2% | – |
| Public transportation | 0.0%±5.8 pts | 0.5% | – |
| Walked | 2.9%±1.8 pts | 1.7% | – |
| Worked from home | 6.9%±4.0 pts | 9.2% | no clear change |
| Mean travel time to work | 26.6 min±2.5 | 23.8 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 Johnstown (town), Rock County?
No census tract lies mostly in Johnstown (town), Rock County; 1 tract reaches into it (2020 census blocks).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 32Rock County | 2,440 | $76,953 |
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 Johnstown (town), Rock County) · Census block assignment files
How does Johnstown (town), Rock County compare with other places in Wisconsin?
By the Census Bureau's July 2025 estimates, Johnstown (town), Rock County is the 8,654th-most populous of the 16,079 U.S. towns and townships that have one and the 712th-most populous of 1,239 in Wisconsin.
Johnstown (town), Rock 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 | 712th | 1,239 |
Johnstown (town), Rock County's figures with every place in Wisconsin (CSV)
Every place in Wisconsin, sortable · Compare Johnstown (town), Rock 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 Johnstown (town), Rock County?
22 of the 57 figures for Johnstown (town), Rock 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 Johnstown (town), Rock 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.