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Single Family ResidenceResidential
$353,093$309 / ft²
TopHap EstimateOur estimate of what this home would sell for today, based on nearby sales, the home's size and features, and local price trends. It is a starting point, not an appraisal.· confidence 88How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Sep 24, 2026
Last sold for $333,750 on Oct 3, 2025

1603 ONTARIO DR

JANESVILLE, WI 53545
3
Beds
2
Baths
1,144 ft²
Living AreaTotal finished area of the structures, from county records. Some counties include shared space like hallways or a building gym, so it may not match a listing.
0.22 ac
Lot SizeThe size of the land the home sits on, from county records.
1975
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
5
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$353K
$311K low$395K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$333,750 · Oct 3, 2025

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$3,766 (2025)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$223,200 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$27,900
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$195,300
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$237,295

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
StyleThe architectural style of the home, such as ranch or colonial.Ranch
CountyROCK
Effective Year BuiltAn adjusted build year that accounts for condition and major remodels. A big renovation can make a home count as newer than it is.1977
Lot (acres)The size of the land the home sits on, from county records.0.22
HeatingThe type of heating system in the home.Yes
FireplaceWhether the home has a fireplace, and what kind.Yes
PoolWhether the property has a pool, and what kind, such as in-ground.No
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Porch · 24 ft²

Transaction History(3)

Sales and refinances filed with the county for this home. Not every transfer is a normal sale, so check the type before comparing prices.

Foreclosure Filings(1)

Assigned SchoolsThe public schools this address is zoned for. Boundaries change, so confirm with the district before you count on it.

M
Marshall Middle SchoolC+
Middle · Grades 6–8 · 0.8 mi
E
Monroe Elementary SchoolA
Elementary · Grades KG–5 · 0.9 mi
H
Craig High SchoolD+
High · Grades 9–12 · 1.7 mi

District: Janesville School District

Neighborhood · ZIP 53545These are comparison scores, not percentages. 100 equals the national average, so 150 means about 50% above average.

CrimeLocal crime compared with the rest of the country, where 100 is average. It reflects things like population density, income, and how crime gets reported.97
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.87
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.30

Index scale: 100 = US average (tick). Lower is better.

Homes occupiedThe share of homes here that someone lives in. The rest sit empty, including vacation and for-sale homes.94%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.21%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.8.0%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.1%
PopulationHow many people live in this area.22,576
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.928 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$73,159
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$89,377
Average tempThe average temperature here across a full year.47°F
Annual precipHow much rain and melted snow falls here in a typical year.34 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.54%

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Data by ATTOM. Valuations are automated estimates, not appraisals. Photos from Google Street View and may not depict the current property state.

How this home compares

1603 Ontario Dr measured against every home in its neighborhood, its ZIP code and its county, using county assessor records refreshed nightly. A home can stand out in one of those areas and look ordinary in another, because each one holds a different mix of homes.

  • Worth more than 77% of homes in Janesville 53545
  • Costs more per square foot than 98% of homes in Janesville 53545
  • Smaller than 78% of homes in Janesville 53545
  • Has a smaller lot than 65% of homes in Rock County
  • Newer than 80% of homes in Janesville 53545

What homes are worth in Janesville 53545

Each bar is how many homes fall in that price range. The marker is this home.

This home
$152K$698K

This home is worth more than 77% of homes in Janesville 53545.

How it measures up in Janesville 53545

The dot is this home. The mark in the middle is the typical home in Janesville 53545.

Estimated value$353,093
CheaperTypical $281,915Pricier

Pricier than 77% of homes nearby

Price per ft²$309
CheaperTypical $202Pricier

Pricier than 98% of homes nearby

Living area1,144 ft²
SmallerTypical 1,430 ft²Bigger

Bigger than 22% of homes nearby

Lot size0.22 ac
SmallerTypical 0.23 acBigger

Bigger than 42% of homes nearby

Year built1975
OlderTypical 1958Newer

Newer than 80% of homes nearby

How 1603 Ontario Dr ranks against every home in each area.
MeasureThis homeJanesville 53545Rock County
Estimated valuepricier than$353,09377% of homes69% of homes
Price per ft²pricier than$30998% of homes98% of homes
Living areabigger than1,144 ft²22% of homes29% of homes
Lot sizebigger than0.22 ac42% of homes35% of homes
Year builtnewer than197580% of homes65% of homes

About 1603 Ontario Dr

How much is 1603 Ontario Dr, Janesville, WI worth?

The TopHap Estimate for 1603 Ontario Dr, Janesville, WI is $353,093 as of Sep 24, 2026. The likely range is $311,344 to $394,842. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 1603 Ontario Dr, Janesville, WI last sell?

1603 Ontario Dr, Janesville, WI last sold on Oct 3, 2025 for $333,750, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

How big is 1603 Ontario Dr, Janesville, WI?

1603 Ontario Dr, Janesville, WI has 3 bedrooms, 2 bathrooms, 1,144 square feet of living space and a 0.22-acre lot.

When was 1603 Ontario Dr, Janesville, WI built?

1603 Ontario Dr, Janesville, WI was built in 1975, making it 51 years old. It is a ranch home. The building has 1 story.

What schools serve 1603 Ontario Dr, Janesville, WI?

1603 Ontario Dr, Janesville, WI is assigned to Marshall Middle School (middle), rated C+; Monroe Elementary School (elementary), rated A; Craig High School (high), rated D+. All sit in Janesville School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 1603 Ontario Dr, Janesville, WI compare to other homes in Janesville 53545?

Among the 7,842 homes in Janesville 53545, it is worth more than 77% of them ($353,093 against a typical $281,915), its price per square foot is higher than 98% of them ($309 against a typical $202), it is bigger than 22% of them (1,144 ft² against a typical 1,430 ft²), its lot is bigger than 42% of them (0.22 ac against a typical 0.23 ac) and it is newer than 80% of them (1975 against a typical 1958). Measured against all of Rock County, it is worth more than 69% of homes there. These shares are recounted nightly from the full county assessor record for each area, not from active listings.

What are the property taxes on 1603 Ontario Dr, Janesville, WI?

The 2025 property tax bill for 1603 Ontario Dr, Janesville, WI was $3,766. The county assessed it at $223,200.

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