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Single Family ResidenceResidential
$475,388$269 / 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 $280,000 on Mar 24, 2004

20W171 99TH ST

LEMONT, IL 60439
1.5
Baths
1,768 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.
0.49 ac
Lot SizeThe size of the land the home sits on, from county records.
1965
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

$475K
$454K low$497K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$280,000 · Mar 24, 2004

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$7,086 (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.$138,536 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$57,395
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$81,141
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$128,393
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$415,608

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
CountyDUPAGE
Effective Year BuiltAn adjusted build year that accounts for condition and major remodels. A big renovation can make a home count as newer than it is.1986
Lot (acres)The size of the land the home sits on, from county records.0.49
CoolingThe type of cooling or air conditioning in the home.Central
FireplaceWhether the home has a fireplace, and what kind.Yes
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(1)

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.

H
Lemont Township High SchoolA+
High · Grades 9–12 · 2.5 mi
E
Oakwood School
Elementary · Grades PK–1 · 3.4 mi
M
Old Quarry Middle SchoolA+
Middle · Grades 6–8 · 3.6 mi

District: Lemont Township High School District 210

Neighborhood · ZIP 60439These 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.38
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.108
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.50

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.27%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.2.9%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.6%
PopulationHow many people live in this area.25,154
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.776 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$127,381
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$151,623
Average tempThe average temperature here across a full year.49°F
Annual precipHow much rain and melted snow falls here in a typical year.38 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

20w171 99th 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 69% of homes in Lemont 60439
  • Smaller than 69% of homes in Lemont 60439
  • Has a bigger lot than 78% of homes in DuPage County
  • Older than 81% of homes in Lemont 60439

What homes are worth in Lemont 60439

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

This home
$254K$1.1M

This home is worth more than 31% of homes in Lemont 60439.

How it measures up in Lemont 60439

The dot is this home. The mark in the middle is the typical home in Lemont 60439.

Estimated value$475,388
CheaperTypical $592,895Pricier

Pricier than 31% of homes nearby

Price per ft²$269
CheaperTypical $259Pricier

Pricier than 60% of homes nearby

Living area1,768 ft²
SmallerTypical 2,311 ft²Bigger

Bigger than 31% of homes nearby

Lot size0.49 ac
SmallerTypical 0.27 acBigger

Bigger than 74% of homes nearby

Year built1965
OlderTypical 1993Newer

Newer than 19% of homes nearby

How 20w171 99th St ranks against every home in each area.
MeasureThis homeLemont 60439DuPage County
Estimated valuepricier than$475,38831% of homes54% of homes
Price per ft²pricier than$26960% of homes64% of homes
Living areabigger than1,768 ft²31% of homes47% of homes
Lot sizebigger than0.49 ac74% of homes78% of homes
Year builtnewer than196519% of homes27% of homes

About 20w171 99th St

How much is 20w171 99th St, Lemont, IL worth?

The TopHap Estimate for 20w171 99th St, Lemont, IL is $475,388 as of Sep 24, 2026. The likely range is $453,636 to $497,140. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 20w171 99th St, Lemont, IL last sell?

20w171 99th St, Lemont, IL last sold on Mar 24, 2004 for $280,000, according to the county's recorded deed.

How big is 20w171 99th St, Lemont, IL?

20w171 99th St, Lemont, IL has 1.5 bathrooms, 1,768 square feet of living space and a 0.49-acre lot.

When was 20w171 99th St, Lemont, IL built?

20w171 99th St, Lemont, IL was built in 1965, making it 61 years old. The building has 1 story.

What schools serve 20w171 99th St, Lemont, IL?

20w171 99th St, Lemont, IL is assigned to Lemont Township High School (high), rated A+; Oakwood School (elementary); Old Quarry Middle School (middle), rated A+. All sit in Lemont Township High School District 210. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 20w171 99th St, Lemont, IL compare to other homes in Lemont 60439?

Among the 9,067 homes in Lemont 60439, it is worth more than 31% of them ($475,388 against a typical $592,895), its price per square foot is higher than 60% of them ($269 against a typical $259), it is bigger than 31% of them (1,768 ft² against a typical 2,311 ft²), its lot is bigger than 74% of them (0.49 ac against a typical 0.27 ac) and it is newer than 19% of them (1965 against a typical 1993). Measured against all of DuPage County, it is worth more than 54% 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 20w171 99th St, Lemont, IL?

The 2025 property tax bill for 20w171 99th St, Lemont, IL was $7,086. The county assessed it at $138,536.

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