Skip to content
Skip to content
TopHapOpen in map
Single Family ResidenceResidential
$373,431$179 / 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 Oct 21, 2026

521 UNION ST

HARTFORD, WI 53027
5
Beds
2 / 1
Baths
2,091 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.
0.2 ac
Lot SizeThe size of the land the home sits on, from county records.
1966
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
8
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

$373K
$361K low$386K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$3,198 (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.$262,500 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$39,500
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$223,000
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$262,500
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$319,234

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.Bi-Level
CountyWashington
Lot (acres)The size of the land the home sits on, from county records.0.20
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
RoofThe main material covering the roof, such as asphalt shingle or tile.Shingle
HeatingThe type of heating system in the home.Hot Water
CoolingThe type of cooling or air conditioning in the home.Yes
FireplaceWhether the home has a fireplace, and what kind.Yes

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.

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

E
Rossman Elementary SchoolA
Elementary · Grades PK–5 · 0.2 mi
H
Hartford High SchoolC+
High · Grades 9–12 · 1.3 mi
M
Central Middle SchoolC-
Middle · Grades 6–8 · 1.6 mi

District: Hartford Union High School District

Neighborhood · ZIP 53027These 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.100
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.81
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.96%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.20%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.6.4%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.0.9%
PopulationHow many people live in this area.24,479
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.258 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$88,697
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$104,318
Average tempThe average temperature here across a full year.46°F
Annual precipHow much rain and melted snow falls here in a typical year.33 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.54%

Owner Tools

Do you own this home?
Claim this home

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

521 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 less per square foot than 82% of homes in Hartford 53027
  • Bigger than 74% of homes in Hartford 53027
  • Has a smaller lot than 88% of homes in Washington County
  • Older than 73% of homes in Washington County

What homes are worth in Hartford 53027

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

This home
$212K$1M

This home is worth more than 37% of homes in Hartford 53027.

How it measures up in Hartford 53027

The dot is this home. The mark in the middle is the typical home in Hartford 53027.

Estimated value$373,431
CheaperTypical $421,555Pricier

Pricier than 37% of homes nearby

Price per ft²$179
CheaperTypical $224Pricier

Pricier than 18% of homes nearby

Living area2,091 ft²
SmallerTypical 1,698 ft²Bigger

Bigger than 74% of homes nearby

Lot size0.2 ac
SmallerTypical 0.33 acBigger

Bigger than 19% of homes nearby

Year built1966
OlderTypical 1997Newer

Newer than 30% of homes nearby

How 521 Union St ranks against every home in each area.
MeasureThis homeHartford 53027Washington County
Estimated valuepricier than$373,43137% of homes39% of homes
Price per ft²pricier than$17918% of homes20% of homes
Living areabigger than2,091 ft²74% of homes72% of homes
Lot sizebigger than0.2 ac19% of homes12% of homes
Year builtnewer than196630% of homes27% of homes

About 521 Union St

How much is 521 Union St, Hartford, WI worth?

The TopHap Estimate for 521 Union St, Hartford, WI is $373,431 as of Oct 21, 2026. The likely range is $360,623 to $386,239. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

How big is 521 Union St, Hartford, WI?

521 Union St, Hartford, WI has 5 bedrooms, 2 bathrooms, 2,091 square feet of living space and a 0.20-acre lot.

When was 521 Union St, Hartford, WI built?

521 Union St, Hartford, WI was built in 1966, making it 60 years old. It is a bi-level home. The building has 1 story.

What schools serve 521 Union St, Hartford, WI?

521 Union St, Hartford, WI is assigned to Rossman Elementary School (elementary), rated A; Hartford High School (high), rated C+; Central Middle School (middle), rated C-. All sit in Hartford Union High School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 521 Union St, Hartford, WI compare to other homes in Hartford 53027?

Among the 8,609 homes in Hartford 53027, it is worth more than 37% of them ($373,431 against a typical $421,555), its price per square foot is higher than 18% of them ($179 against a typical $224), it is bigger than 74% of them (2,091 ft² against a typical 1,698 ft²), its lot is bigger than 19% of them (0.2 ac against a typical 0.33 ac) and it is newer than 30% of them (1966 against a typical 1997). Measured against all of Washington County, it is worth more than 39% 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 521 Union St, Hartford, WI?

The 2025 property tax bill for 521 Union St, Hartford, WI was $3,198. The county assessed it at $262,500.

More homes on Union St

Closest homes

More homes in Hartford 53027

Assigned schools

Explore the area

See this home in context

Open 521 Union St on TopHap’s interactive map to compare it against every sale nearby, overlay school zones and flood risk, and run a CMA.

Open in map
A flyover of TopHap's photorealistic 3D map, with recorded sale prices pinned to homes
Search any address, city, zip, or county…3D$1.9M$6.25MOpen in map