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Single Family ResidenceResidential
$359,366$300 / 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 79How 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

511 S UNION AVE

MADISON, SD 57042
3
Beds
7
Baths
1,196 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.
0.33 ac
Lot SizeThe size of the land the home sits on, from county records.
1976
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$359K
$285K low$434K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$2,746 (2026)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$190,500 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$19,600
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$170,900
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$190,500
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$190,500

Climate Risk

Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.11 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.34%
FEMA Flood ZoneFEMA's flood zone for this address. Zones starting with A or V are high risk, and lenders usually require flood insurance there.1 percent flood zone

Scores 0–100; higher = greater projected risk.

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
CountyLAKE
Lot (acres)The size of the land the home sits on, from county records.0.33
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

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

E
Madison Elementary - 07B
Elementary · Grades KG–5 · 1.2 mi
H
Madison High School - 01B-
High · Grades 9–12 · 1.4 mi
M
Madison Middle School - 02B-
Middle · Grades 6–8 · 1.4 mi

District: Madison Central School District 39-2

Neighborhood · ZIP 57042These 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.125
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.92
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.23

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.84%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.28%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.10%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.0.5%
PopulationHow many people live in this area.7,821
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.40 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$72,886
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$87,201
Average tempThe average temperature here across a full year.44°F
Annual precipHow much rain and melted snow falls here in a typical year.25 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.63%

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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

511 S Union Ave 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.

What homes are worth in Madison 57042

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

This home
$229K$616K

This home is worth more than 52% of homes in Madison 57042.

How it measures up in Madison 57042

The dot is this home. The mark in the middle is the typical home in Madison 57042.

Estimated value$359,366
CheaperTypical $356,177Pricier

Pricier than 52% of homes nearby

Price per ft²$300
CheaperTypical $278Pricier

Pricier than 59% of homes nearby

Living area1,196 ft²
SmallerTypical 1,280 ft²Bigger

Bigger than 44% of homes nearby

Lot size0.33 ac
SmallerTypical 0.29 acBigger

Bigger than 60% of homes nearby

Year built1976
OlderTypical 1963Newer

Newer than 60% of homes nearby

How 511 S Union Ave ranks against every home in each area.
MeasureThis homeMadison 57042Lake County
Estimated valuepricier than$359,36652% of homes53% of homes
Price per ft²pricier than$30059% of homes63% of homes
Living areabigger than1,196 ft²44% of homes40% of homes
Lot sizebigger than0.33 ac60% of homes52% of homes
Year builtnewer than197660% of homes54% of homes

About 511 S Union Ave

How much is 511 S Union Ave, Madison, SD worth?

The TopHap Estimate for 511 S Union Ave, Madison, SD is $359,366 as of Sep 24, 2026. The likely range is $284,975 to $433,757. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 511 S Union Ave, Madison, SD last sell?

511 S Union Ave, Madison, SD last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 511 S Union Ave, Madison, SD?

511 S Union Ave, Madison, SD has 3 bedrooms, 7 bathrooms, 1,196 square feet of living space and a 0.33-acre lot.

When was 511 S Union Ave, Madison, SD built?

511 S Union Ave, Madison, SD was built in 1976, making it 50 years old. The building has 1 story.

What schools serve 511 S Union Ave, Madison, SD?

511 S Union Ave, Madison, SD is assigned to Madison Elementary - 07 (elementary), rated B; Madison High School - 01 (high), rated B-; Madison Middle School - 02 (middle), rated B-. All sit in Madison Central School District 39-2. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 511 S Union Ave, Madison, SD compare to other homes in Madison 57042?

Among the 3,358 homes in Madison 57042, it is worth more than 52% of them ($359,366 against a typical $356,177), its price per square foot is higher than 59% of them ($300 against a typical $278), it is bigger than 44% of them (1,196 ft² against a typical 1,280 ft²), its lot is bigger than 60% of them (0.33 ac against a typical 0.29 ac) and it is newer than 60% of them (1976 against a typical 1963). Measured against all of Lake County, it is worth more than 53% 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 511 S Union Ave, Madison, SD?

The 2026 property tax bill for 511 S Union Ave, Madison, SD was $2,746. The county assessed it at $190,500.

More homes on S Union Ave

Closest homes

More homes in Madison 57042

Assigned schools

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