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Single Family ResidentialResidential
$230,906$174 / 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 90How 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

623 MAIN ST

MAZON, IL 60444
0
Baths
1,325 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.
0.3 ac
Lot SizeThe size of the land the home sits on, from county records.
1971
Year BuiltThe year the home was originally built, according to county records.

Valuation

$231K
$209K low$253K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$7,019 (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.$77,003 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$7,779
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$69,224
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$73,010
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$231,009

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residential
CountyGRUNDY
Lot (acres)The size of the land the home sits on, from county records.0.30
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.

E
Mazon-Verona-Kinsman Elementary SchoolB
Elementary · Grades PK–4 · 0.5 mi
M
Mazon-Verona-Kinsman Middle SchoolC
Middle · Grades 5–8 · 0.5 mi
H
Seneca High SchoolC-
High · Grades 9–12 · 10.7 mi

District: Seneca Township High School District 160

Neighborhood · ZIP 60444These 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.101
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.70
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.46

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.13%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.8.2%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.9%
PopulationHow many people live in this area.2,465
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.50 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$95,182
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$116,874
Average tempThe average temperature here across a full year.50°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%

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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

623 Main 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 77% of homes in Grundy County
  • Smaller than 70% of homes in Grundy County
  • Has a smaller lot than 73% of homes in Mazon 60444
  • Older than 67% of homes in Grundy County

What homes are worth in Mazon 60444

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

This home
$95K$1.3M

This home is worth more than 40% of homes in Mazon 60444.

How it measures up in Mazon 60444

The dot is this home. The mark in the middle is the typical home in Mazon 60444.

Estimated value$230,906
CheaperTypical $269,065Pricier

Pricier than 40% of homes nearby

Price per ft²$174
CheaperTypical $162Pricier

Pricier than 61% of homes nearby

Living area1,325 ft²
SmallerTypical 1,641 ft²Bigger

Bigger than 33% of homes nearby

Lot size0.3 ac
SmallerTypical 0.59 acBigger

Bigger than 27% of homes nearby

Year built1971
OlderTypical 1974Newer

Newer than 47% of homes nearby

How 623 Main St ranks against every home in each area.
MeasureThis homeMazon 60444Grundy County
Estimated valuepricier than$230,90640% of homes23% of homes
Price per ft²pricier than$17461% of homes38% of homes
Living areabigger than1,325 ft²33% of homes30% of homes
Lot sizebigger than0.3 ac27% of homes56% of homes
Year builtnewer than197147% of homes33% of homes

About 623 Main St

How much is 623 Main St, Mazon, IL worth?

The TopHap Estimate for 623 Main St, Mazon, IL is $230,906 as of Oct 21, 2026. The likely range is $208,938 to $252,874. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 623 Main St, Mazon, IL last sell?

623 Main St, Mazon, IL last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 623 Main St, Mazon, IL?

623 Main St, Mazon, IL has 1,325 square feet of living space and a 0.30-acre lot.

When was 623 Main St, Mazon, IL built?

623 Main St, Mazon, IL was built in 1971, making it 55 years old.

What schools serve 623 Main St, Mazon, IL?

623 Main St, Mazon, IL is assigned to Mazon-Verona-Kinsman Elementary School (elementary), rated B; Mazon-Verona-Kinsman Middle School (middle), rated C; Seneca High School (high), rated C-. All sit in Seneca Township High School District 160. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 623 Main St, Mazon, IL compare to other homes in Mazon 60444?

Among the 731 homes in Mazon 60444, it is worth more than 40% of them ($230,906 against a typical $269,065), its price per square foot is higher than 61% of them ($174 against a typical $162), it is bigger than 33% of them (1,325 ft² against a typical 1,641 ft²), its lot is bigger than 27% of them (0.3 ac against a typical 0.59 ac) and it is newer than 47% of them (1971 against a typical 1974). Measured against all of Grundy County, it is worth more than 23% 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 623 Main St, Mazon, IL?

The 2025 property tax bill for 623 Main St, Mazon, IL was $7,019. The county assessed it at $77,003.

More homes on Main St

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Assigned schools

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