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Single Family ResidenceResidential
$296,662$193 / 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 94How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Aug 30, 2026
Last sold for $161,500 on Nov 5, 2003

421 THORNTON ST

LOCKPORT, IL 60441
1
Baths
1,539 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.
0.32 ac
Lot SizeThe size of the land the home sits on, from county records.
1909
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.

Valuation

$297K
$279K low$314K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$161,500 · Nov 5, 2003

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$4,871 (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.$74,407 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$25,035
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$49,372
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$69,410
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$223,221

Climate Risk

Overall riskThe average of the five hazard scores below, on a 0 to 100 scale. Higher means greater projected risk over the coming decades.38
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
5
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
72
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
73
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
40
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.
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.minimal

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
CountyWILL
Lot (acres)The size of the land the home sits on, from county records.0.32
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

Transaction History(2)

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
Milne Grove Elementary SchoolA+
Elementary · Grades KG–3 · 0.5 mi
M
Kelvin Grove Middle SchoolA
Middle · Grades 4–8 · 0.7 mi
H
Lockport Township High SchoolA+
High · Grades 9–12 · 1.1 mi

District: Lockport School District 91

Neighborhood · ZIP 60441These 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.96
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.101
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.23%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.6.5%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.5%
PopulationHow many people live in this area.35,427
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,391 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$100,510
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$113,100
Average tempThe average temperature here across a full year.49°F
Annual precipHow much rain and melted snow falls here in a typical year.37 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.54%

Owner Tools

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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

421 Thornton 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 71% of homes in Lockport 60441
  • Costs less per square foot than 77% of homes in Lockport 60441
  • Has a bigger lot than 80% of homes in Lockport 60441
  • Older than 97% of homes in Will County

What homes are worth in Lockport 60441

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

This home
$127K$663K

This home is worth more than 29% of homes in Lockport 60441.

How it measures up in Lockport 60441

The dot is this home. The mark in the middle is the typical home in Lockport 60441.

Estimated value$296,662
CheaperTypical $349,288Pricier

Pricier than 29% of homes nearby

Price per ft²$193
CheaperTypical $213Pricier

Pricier than 23% of homes nearby

Living area1,539 ft²
SmallerTypical 1,764 ft²Bigger

Bigger than 36% of homes nearby

Lot size0.32 ac
SmallerTypical 0.22 acBigger

Bigger than 80% of homes nearby

Year built1909
OlderTypical 1996Newer

Newer than 5% of homes nearby

How 421 Thornton St ranks against every home in each area.
MeasureThis homeLockport 60441Will County
Estimated valuepricier than$296,66229% of homes30% of homes
Price per ft²pricier than$19323% of homes37% of homes
Living areabigger than1,539 ft²36% of homes36% of homes
Lot sizebigger than0.32 ac80% of homes74% of homes
Year builtnewer than19095% of homes3% of homes

About 421 Thornton St

How much is 421 Thornton St, Lockport, IL worth?

The TopHap Estimate for 421 Thornton St, Lockport, IL is $296,662 as of Aug 30, 2026. The likely range is $279,492 to $313,832. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 421 Thornton St, Lockport, IL last sell?

421 Thornton St, Lockport, IL last sold on Nov 5, 2003 for $161,500, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 421 Thornton St, Lockport, IL?

421 Thornton St, Lockport, IL has 1 bathrooms, 1,539 square feet of living space and a 0.32-acre lot.

When was 421 Thornton St, Lockport, IL built?

421 Thornton St, Lockport, IL was built in 1909, making it 117 years old. The building has 1 story.

What schools serve 421 Thornton St, Lockport, IL?

421 Thornton St, Lockport, IL is assigned to Milne Grove Elementary School (elementary), rated A+; Kelvin Grove Middle School (middle), rated A; Lockport Township High School (high), rated A+. All sit in Lockport School District 91. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 421 Thornton St, Lockport, IL compare to other homes in Lockport 60441?

Among the 12,513 homes in Lockport 60441, it is worth more than 29% of them ($296,662 against a typical $349,288), its price per square foot is higher than 23% of them ($193 against a typical $213), it is bigger than 36% of them (1,539 ft² against a typical 1,764 ft²), its lot is bigger than 80% of them (0.32 ac against a typical 0.22 ac) and it is newer than 5% of them (1909 against a typical 1996). Measured against all of Will County, it is worth more than 30% 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 421 Thornton St, Lockport, IL?

The 2025 property tax bill for 421 Thornton St, Lockport, IL was $4,871. The county assessed it at $74,407.

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