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Single Family ResidentialResidential
$142,810$131 / 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 85How 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

509 4TH AVE

MENDOTA, IL 61342
0
Baths
1,092 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.
0.21 ac
Lot SizeThe size of the land the home sits on, from county records.
1958
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.

Valuation

$143K
$121K low$165K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$3,426 (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.$45,504 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$6,540
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$38,964
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$41,587
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$136,512

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.32
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
1
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
73
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
67
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
19
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.

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 Residential
CountyLASALLE
Lot (acres)The size of the land the home sits on, from county records.0.21
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
Blackstone Elementary School
Elementary · Grades KG–1 · 0.9 mi
M
Northbrook SchoolB-
Middle · Grades 5–8 · 1.0 mi
H
Mendota Township High SchoolB-
High · Grades 9–12 · 2.0 mi

District: Mendota Township High School District 280

Neighborhood · ZIP 61342These 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.108
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 100.43

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.92%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.13%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.8.5%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.8%
PopulationHow many people live in this area.8,916
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.83 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$63,690
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$84,182
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.55%

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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

509 4th 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.

  • Costs more per square foot than 67% of homes in Mendota 61342
  • Smaller than 82% of homes in Mendota 61342
  • Newer than 65% of homes in Mendota 61342

What homes are worth in Mendota 61342

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

This home
$63K$485K

This home is worth more than 45% of homes in Mendota 61342.

How it measures up in Mendota 61342

The dot is this home. The mark in the middle is the typical home in Mendota 61342.

Estimated value$142,810
CheaperTypical $152,108Pricier

Pricier than 45% of homes nearby

Price per ft²$131
CheaperTypical $109Pricier

Pricier than 67% of homes nearby

Living area1,092 ft²
SmallerTypical 1,552 ft²Bigger

Bigger than 18% of homes nearby

Lot size0.21 ac
SmallerTypical 0.25 acBigger

Bigger than 43% of homes nearby

Year built1958
OlderTypical 1950Newer

Newer than 65% of homes nearby

How 509 4th Ave ranks against every home in each area.
MeasureThis homeMendota 61342LaSalle County
Estimated valuepricier than$142,81045% of homes37% of homes
Price per ft²pricier than$13167% of homes51% of homes
Living areabigger than1,092 ft²18% of homes27% of homes
Lot sizebigger than0.21 ac43% of homes47% of homes
Year builtnewer than195865% of homes57% of homes

About 509 4th Ave

How much is 509 4th Ave, Mendota, IL worth?

The TopHap Estimate for 509 4th Ave, Mendota, IL is $142,810 as of Sep 24, 2026. The likely range is $120,747 to $164,873. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 509 4th Ave, Mendota, IL last sell?

509 4th Ave, Mendota, IL last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 509 4th Ave, Mendota, IL?

509 4th Ave, Mendota, IL has 1,092 square feet of living space and a 0.21-acre lot.

When was 509 4th Ave, Mendota, IL built?

509 4th Ave, Mendota, IL was built in 1958, making it 68 years old. The building has 1 story.

What schools serve 509 4th Ave, Mendota, IL?

509 4th Ave, Mendota, IL is assigned to Blackstone Elementary School (elementary); Northbrook School (middle), rated B-; Mendota Township High School (high), rated B-. All sit in Mendota Township High School District 280. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 509 4th Ave, Mendota, IL compare to other homes in Mendota 61342?

Among the 2,805 homes in Mendota 61342, it is worth more than 45% of them ($142,810 against a typical $152,108), its price per square foot is higher than 67% of them ($131 against a typical $109), it is bigger than 18% of them (1,092 ft² against a typical 1,552 ft²), its lot is bigger than 43% of them (0.21 ac against a typical 0.25 ac) and it is newer than 65% of them (1958 against a typical 1950). Measured against all of LaSalle County, it is worth more than 37% 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 509 4th Ave, Mendota, IL?

The 2025 property tax bill for 509 4th Ave, Mendota, IL was $3,426. The county assessed it at $45,504.

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Assigned schools

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