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Residential (General/Single)Residential
$424,346$324 / 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 95How 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 $420,000 on May 27, 2026

307 UNION ST

SUN PRAIRIE, WI 53590
3
Beds
2
Baths
1,309 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.
0.25 ac
Lot SizeThe size of the land the home sits on, from county records.
1944
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
1
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$424K
$403K low$446K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$420,000 · May 27, 2026

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$6,691 (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.$339,500 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$66,100
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$273,400
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$339,500

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Residential (General/Single)
StyleThe architectural style of the home, such as ranch or colonial.Cape Cod
CountyDANE
Lot (acres)The size of the land the home sits on, from county records.0.25
HeatingThe type of heating system in the home.Forced Air With Air Conditioning
CoolingThe type of cooling or air conditioning in the home.Yes
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Attached
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 · 280 ft²Shed · 96 ft²Patio · 600 ft²

Transaction History(6)

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
Northside Elementary SchoolD
Elementary · Grades PK–5 · 0.5 mi
H
Sun Prairie East High SchoolD+
High · Grades 9–12 · 1.1 mi
M
Prairie View Middle SchoolC
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

307 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.

  • Costs more per square foot than 82% of homes in Sun Prairie 53590
  • Smaller than 75% of homes in Dane County
  • Older than 96% 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$883K

This home is worth more than 45% 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$424,346
CheaperTypical $438,230Pricier

Pricier than 45% of homes nearby

Price per ft²$324
CheaperTypical $263Pricier

Pricier than 82% of homes nearby

Living area1,309 ft²
SmallerTypical 1,504 ft²Bigger

Bigger than 28% of homes nearby

Lot size0.25 ac
SmallerTypical 0.26 acBigger

Bigger than 46% of homes nearby

Year built1944
OlderTypical 1994Newer

Newer than 4% of homes nearby

How 307 Union St ranks against every home in each area.
MeasureThis homeSun Prairie 53590Dane County
Estimated valuepricier than$424,34645% of homes46% of homes
Price per ft²pricier than$32482% of homes79% of homes
Living areabigger than1,309 ft²28% of homes25% of homes
Lot sizebigger than0.25 ac46% of homes48% of homes
Year builtnewer than19444% of homes16% of homes

About 307 Union St

How much is 307 Union St, Sun Prairie, WI worth?

The TopHap Estimate for 307 Union St, Sun Prairie, WI is $424,346 as of Sep 24, 2026. The likely range is $402,725 to $445,967. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 307 Union St, Sun Prairie, WI last sell?

307 Union St, Sun Prairie, WI last sold on May 27, 2026 for $420,000, according to the county's recorded deed. TopHap holds 5 recorded sales for this parcel.

How big is 307 Union St, Sun Prairie, WI?

307 Union St, Sun Prairie, WI has 3 bedrooms, 2 bathrooms, 1,309 square feet of living space and a 0.25-acre lot.

When was 307 Union St, Sun Prairie, WI built?

307 Union St, Sun Prairie, WI was built in 1944, making it 82 years old. It is a cape cod home. The building has 1 story.

What schools serve 307 Union St, Sun Prairie, WI?

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

How does 307 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 45% of them ($424,346 against a typical $438,230), its price per square foot is higher than 82% of them ($324 against a typical $263), it is bigger than 28% of them (1,309 ft² against a typical 1,504 ft²), its lot is bigger than 46% of them (0.25 ac against a typical 0.26 ac) and it is newer than 4% of them (1944 against a typical 1994). Measured against all of Dane County, it is worth more than 46% 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 307 Union St, Sun Prairie, WI?

The 2025 property tax bill for 307 Union St, Sun Prairie, WI was $6,691. The county assessed it at $339,500.

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