Johnstown, Wisconsin.
Typical home $459,369 (+11.8% in a year). Janesville-Beloit, WI metro.
to buy the typical home at today's mortgage rate — +$478 (+25%) since Dec 2023.
- 1 year
- Up $48,612 +12%
- $410,757$459,369 since Sep 2025
Monthly payment to buy the typical home
Home value × that month's 30-year mortgage rate, 20% down, principal and interest. This is the line households feel: prices and rates compound each other.
- Johnstown$2,411
- Wisconsin$1,770
- United States$1,922
Typical home values in Johnstown, WI rose 11.8% over the past year — faster than the nation's +1.2%.
Living in Johnstown, Rock County, Wisconsin
Johnstown is a town of 766 people in Rock County. Half its households earn more than $84,609 a year and half less, against $75,673 across Rock County; 6% of its people live below the poverty line. 89% of its homes are lived in by their owners and 11% are rented. Unemployment in Rock County was 3.7% in August 2026, and the county had 0.2% more jobs in 2025 than the year before. The most residents work in manufacturing, then schools and health care.
Written by AI Claude Sonnet 5.5 wrote this on 23 October 2026 from the figures here, a list of nearby places and what it knows. It can be wrong or out of date.
What it’s like
The place. Johnstown is a very small town in Rock County, Wisconsin, where the residents are older than in most places and nearly all of them own the homes they live in. Household incomes run higher than across the county, and fewer people live below the poverty line than you might expect. Winters are cold, with January the coldest month and highs staying below freezing, while July brings warm summer days and the year's rain and melted snow add up to a fairly wet climate.
Work. Residents work mostly in manufacturing, in schools, hospitals and social care, and in shops, with other services close behind. Commutes are fairly long, so many people drive some distance to their jobs, and only a small number work from home. Across Rock County, some of the largest workplaces are Mercy Health System, the Janesville School District and Beloit Memorial Hospital.
Things to do. Rotary Botanical Gardens, a botanical garden, is a short drive away, as is Whitewater Lake, a reservoir. For a longer drive, Geneva Lake is a lake that draws visitors from across the region, and Aztalan State Park is an archaeological site worth the trip.
Report a mistake
- 287households
- 24%of adults have a degree
- 6%below the poverty line
- 27 mintypical commute
- 7%work from home
What residents work in
Employed residents by industry, from the Census survey. Rock County had 69,744 jobs in 2025, 0.2% more than the year before (Bureau of Labor Statistics).
Weather through the year
Coldest in January, with highs near 29° and lows near 13°; warmest in July, with highs near 83° and lows near 61°. About 37 inches of rain and melted snow a year.
Average daily high and low, 1991–2020, at the Delavan Wwtp weather station, 10 miles away (NOAA).
Largest workplaces in Rock County
- Mercy Health SystemGeneral hospital2,960FTE
- Janesville School DistrictSchool district1,433FTE
- Beloit Memorial HospitalGeneral hospital1,179FTE
- AmazonGeneral warehousing and storage1,134
- JP Cullen & SonsInstitutional building construction general contractors817
- Beloit School DistrictSchool district802FTE
- LeMansGeneral warehousing and storage728
- W.W. GraingerIndustrial supplies merchant wholesalers691
Staff on average in 2025, as each workplace reported it to OSHA with its injury records: 210 workplaces with 20 or more staff, 29,735 people in all across the county; Johnstown has none of its own. Hospitals come from their Medicare cost reports (CMS, 2023) and school districts from the Common Core of Data (NCES, 2023–24); FTE marks full-time equivalent staff. Not listed: many offices and banks, which need not report to OSHA; military bases, whose staff OPM withholds; and, in about half the states, city and county governments.
Natural hazards
- HailRelatively high
- TornadoesRelatively high
- Cold wavesRelatively high
- Strong windRelatively high
- LightningRelatively high
- Inland floodingRelatively moderate
FEMA’s National Risk Index (December 2025) rates the risk each natural hazard poses to the people, buildings and farms across Rock County, against the rest of the country; all of them together, relatively moderate. It is meant for planning, not a substitute for a local risk assessment or a flood map: FEMA’s index.
From the U.S. Census Bureau’s 2020 census and its American Community Survey (2020–2024 five-year estimates), and the Bureau of Labor Statistics. A survey, so each figure has a margin of error, and figures it is not sure of are left out. More on Rock County and the Janesville-Beloit, WI metro.
Johnstown home values
Zillow measures a city over its municipal boundary. Against the state and national figures, mid-tier homes, smoothed and seasonally adjusted.
- Johnstown$459,369
- Wisconsin$337,196
- United States$366,157
When this market ran hot
Each cell is that month's year-on-year home-value growth. Read left to right, top row is the latest year — the 2021–22 band is the boom.
Zip codes with a Johnstown address
A different geography, not a breakdown. The figure above covers the municipality; these zips cover everywhere the Post Office calls Johnstown — often including townships beyond the city limits. Both come straight from Zillow, and they are not expected to average out.
Zillow publishes no zip-level series with this city on the address.