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Single Family ResidenceResidential
$329,156$242 / 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 97How 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 $152,000 on Oct 3, 2005

4122 BOULDER DR

JANESVILLE, WI 53546
3
Beds
2
Baths
1,360 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.
0.23 ac
Lot SizeThe size of the land the home sits on, from county records.
1998
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.

Valuation

$329K
$319K low$339K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$152,000 · Oct 3, 2005

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$4,148 (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.$261,300 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$27,700
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$233,600
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$261,300

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
Lot (acres)The size of the land the home sits on, from county records.0.23
HeatingThe type of heating system in the home.Yes
CoolingThe type of cooling or air conditioning in the home.Yes
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Patio · 192 ft²Porch · 28 ft²

Transaction History(2)

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

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

E
Harmony Elementary SchoolA+
Elementary · Grades PK–3 · 1.1 mi
H
Milton High SchoolC+
High · Grades 9–12 · 4.2 mi
M
Milton Middle SchoolB+
Middle · Grades 7–8 · 4.7 mi

District: Milton School District

Neighborhood · ZIP 53546These 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.102
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.88
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.32

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.96%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.18%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.7.9%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.0%
PopulationHow many people live in this area.31,634
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.403 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$73,028
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$85,718
Average tempThe average temperature here across a full year.47°F
Annual precipHow much rain and melted snow falls here in a typical year.35 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

4122 Boulder 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.

  • Costs more per square foot than 81% of homes in Rock County
  • Has a smaller lot than 65% of homes in Janesville 53546
  • Newer than 85% of homes in Rock County

What homes are worth in Janesville 53546

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

This home
$153K$568K

This home is worth more than 58% of homes in Janesville 53546.

How it measures up in Janesville 53546

The dot is this home. The mark in the middle is the typical home in Janesville 53546.

Estimated value$329,156
CheaperTypical $308,784Pricier

Pricier than 58% of homes nearby

Price per ft²$242
CheaperTypical $220Pricier

Pricier than 71% of homes nearby

Living area1,360 ft²
SmallerTypical 1,363 ft²Bigger

Bigger than 50% of homes nearby

Lot size0.23 ac
SmallerTypical 0.25 acBigger

Bigger than 35% of homes nearby

Year built1998
OlderTypical 1986Newer

Newer than 75% of homes nearby

How 4122 Boulder Dr ranks against every home in each area.
MeasureThis homeJanesville 53546Rock County
Estimated valuepricier than$329,15658% of homes64% of homes
Price per ft²pricier than$24271% of homes81% of homes
Living areabigger than1,360 ft²50% of homes49% of homes
Lot sizebigger than0.23 ac35% of homes39% of homes
Year builtnewer than199875% of homes85% of homes

About 4122 Boulder Dr

How much is 4122 Boulder Dr, Janesville, WI worth?

The TopHap Estimate for 4122 Boulder Dr, Janesville, WI is $329,156 as of Sep 24, 2026. The likely range is $318,943 to $339,369. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 4122 Boulder Dr, Janesville, WI last sell?

4122 Boulder Dr, Janesville, WI last sold on Oct 3, 2005 for $152,000, according to the county's recorded deed.

How big is 4122 Boulder Dr, Janesville, WI?

4122 Boulder Dr, Janesville, WI has 3 bedrooms, 2 bathrooms, 1,360 square feet of living space and a 0.23-acre lot.

When was 4122 Boulder Dr, Janesville, WI built?

4122 Boulder Dr, Janesville, WI was built in 1998, making it 28 years old. It is a ranch home. The building has 1 story.

What schools serve 4122 Boulder Dr, Janesville, WI?

4122 Boulder Dr, Janesville, WI is assigned to Harmony Elementary School (elementary), rated A+; Milton High School (high), rated C+; Milton Middle School (middle), rated B+. All sit in Milton School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 4122 Boulder Dr, Janesville, WI compare to other homes in Janesville 53546?

Among the 10,824 homes in Janesville 53546, it is worth more than 58% of them ($329,156 against a typical $308,784), its price per square foot is higher than 71% of them ($242 against a typical $220), it is bigger than 50% of them (1,360 ft² against a typical 1,363 ft²), its lot is bigger than 35% of them (0.23 ac against a typical 0.25 ac) and it is newer than 75% of them (1998 against a typical 1986). Measured against all of Rock County, it is worth more than 64% 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 4122 Boulder Dr, Janesville, WI?

The 2025 property tax bill for 4122 Boulder Dr, Janesville, WI was $4,148. The county assessed it at $261,300.

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