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Single Family ResidenceResidential
$259,920$215 / 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 96How 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

145 UNION ST

SUN PRAIRIE, WI 53590
2
Beds
1
Baths
1,211 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.
0.28 ac
Lot SizeThe size of the land the home sits on, from county records.
1900
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
1
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$260K
$249K low$270K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$4,523 (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.$232,500 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$67,500
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$165,000
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$232,500
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$263,600

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
CountyDane
Lot (acres)The size of the land the home sits on, from county records.0.28
HeatingThe type of heating system in the home.Forced Air
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Detached
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.Deck · 96 ft²

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

E
Northside Elementary SchoolD+
Elementary · Grades PK–5 · 0.6 mi
H
Sun Prairie East High SchoolA
High · Grades 9–12 · 0.9 mi
M
Prairie View Middle SchoolD+
Middle · Grades 6–8 · 1.9 mi

District: Sun Prairie Area School District

Neighborhood · ZIP 53590These 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.70
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 100.21

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.97%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.36%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.5.8%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.0.8%
PopulationHow many people live in this area.45,977
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.667 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$97,632
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$119,189
Average tempThe average temperature here across a full year.46°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

145 Union St 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 less than 97% of homes in Sun Prairie 53590
  • Costs less per square foot than 81% of homes in Sun Prairie 53590
  • Smaller than 82% of homes in Sun Prairie 53590
  • Older than 98% of homes in Sun Prairie 53590

What homes are worth in Sun Prairie 53590

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

This home
$246K$890K

This home is worth more than 3% of homes in Sun Prairie 53590.

How it measures up in Sun Prairie 53590

The dot is this home. The mark in the middle is the typical home in Sun Prairie 53590.

Estimated value$259,920
CheaperTypical $440,157Pricier

Pricier than 3% of homes nearby

Price per ft²$215
CheaperTypical $264Pricier

Pricier than 19% of homes nearby

Living area1,211 ft²
SmallerTypical 1,504 ft²Bigger

Bigger than 18% of homes nearby

Lot size0.28 ac
SmallerTypical 0.26 acBigger

Bigger than 56% of homes nearby

Year built1900
OlderTypical 1994Newer

Newer than 2% of homes nearby

How 145 Union St ranks against every home in each area.
MeasureThis homeSun Prairie 53590Dane County
Estimated valuepricier than$259,9203% of homes10% of homes
Price per ft²pricier than$21519% of homes28% of homes
Living areabigger than1,211 ft²18% of homes19% of homes
Lot sizebigger than0.28 ac56% of homes56% of homes
Year builtnewer than19002% of homes3% of homes

About 145 Union St

How much is 145 Union St, Sun Prairie, WI worth?

The TopHap Estimate for 145 Union St, Sun Prairie, WI is $259,920 as of Sep 24, 2026. The likely range is $249,387 to $270,453. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

How big is 145 Union St, Sun Prairie, WI?

145 Union St, Sun Prairie, WI has 2 bedrooms, 1 bathrooms, 1,211 square feet of living space and a 0.28-acre lot.

When was 145 Union St, Sun Prairie, WI built?

145 Union St, Sun Prairie, WI was built in 1900, making it 126 years old. The building has 2 stories.

What schools serve 145 Union St, Sun Prairie, WI?

145 Union St, Sun Prairie, WI is assigned to Northside Elementary School (elementary), rated D+; Sun Prairie East High School (high), rated A; Prairie View Middle School (middle), rated D+. All sit in Sun Prairie Area School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 145 Union St, Sun Prairie, WI compare to other homes in Sun Prairie 53590?

Among the 13,562 homes in Sun Prairie 53590, it is worth more than 3% of them ($259,920 against a typical $440,157), its price per square foot is higher than 19% of them ($215 against a typical $264), it is bigger than 18% of them (1,211 ft² against a typical 1,504 ft²), its lot is bigger than 56% of them (0.28 ac against a typical 0.26 ac) and it is newer than 2% of them (1900 against a typical 1994). Measured against all of Dane County, it is worth more than 10% 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 145 Union St, Sun Prairie, WI?

The 2025 property tax bill for 145 Union St, Sun Prairie, WI was $4,523. The county assessed it at $232,500.

More homes on Union St

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More homes in Sun Prairie 53590

Assigned schools

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