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Residential (General/Single)Residential
$385,857
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 91How 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

9531 KNOLLTOP RD

UNION, IL 60180
0
Baths
5 ac
Lot SizeThe size of the land the home sits on, from county records.

Valuation

$386K
$351K low$421K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$1,874 (2024)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$28,168 (2024)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$22,293
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$5,875
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$25,473
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$84,504

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.39 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.51%
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.Residential (General/Single)
CountyMCHENRY
Lot (acres)The size of the land the home sits on, from county records.5.00
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
Leggee Elementary SchoolA
Elementary · Grades KG–5 · 2.6 mi
H
Huntley High SchoolA
High · Grades 9–12 · 2.9 mi
M
Marlowe Middle SchoolB+
Middle · Grades 6–8 · 5.1 mi

District: Huntley Consolidated School District 158

Neighborhood · ZIP 60180These 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.84
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 100.48

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.22%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.3.0%
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.3,015
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.145 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$125,446
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$133,187
Average tempThe average temperature here across a full year.48°F
Annual precipHow much rain and melted snow falls here in a typical year.36 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

9531 Knolltop Rd 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.

  • Has a bigger lot than 96% of homes in McHenry County

What homes are worth in Union 60180

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

This home
$179K$790K

This home is worth more than 48% of homes in Union 60180.

How it measures up in Union 60180

The dot is this home. The mark in the middle is the typical home in Union 60180.

Estimated value$385,857
CheaperTypical $399,243Pricier

Pricier than 48% of homes nearby

Lot size5 ac
SmallerTypical 1.17 acBigger

Bigger than 75% of homes nearby

How 9531 Knolltop Rd ranks against every home in each area.
MeasureThis homeUnion 60180McHenry County
Estimated valuepricier than$385,85748% of homes55% of homes
Lot sizebigger than5 ac75% of homes96% of homes

About 9531 Knolltop Rd

How much is 9531 Knolltop Rd, Union, IL worth?

The TopHap Estimate for 9531 Knolltop Rd, Union, IL is $385,857 as of Sep 24, 2026. The likely range is $350,867 to $420,847. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 9531 Knolltop Rd, Union, IL last sell?

9531 Knolltop Rd, Union, IL last sold on Jan 1, 1900, according to the county's recorded deed.

What schools serve 9531 Knolltop Rd, Union, IL?

9531 Knolltop Rd, Union, IL is assigned to Leggee Elementary School (elementary), rated A; Huntley High School (high), rated A; Marlowe Middle School (middle), rated B+. All sit in Huntley Consolidated School District 158. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 9531 Knolltop Rd, Union, IL compare to other homes in Union 60180?

Among the 653 homes in Union 60180, it is worth more than 48% of them ($385,857 against a typical $399,243) and its lot is bigger than 75% of them (5 ac against a typical 1.17 ac). Measured against all of McHenry County, it is worth more than 55% 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 9531 Knolltop Rd, Union, IL?

The 2024 property tax bill for 9531 Knolltop Rd, Union, IL was $1,874. The county assessed it at $28,168.

More homes on Knolltop Rd

Closest homes

More homes in Union 60180

Assigned schools

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