Skip to content
Skip to content
TopHapOpen in map
Single Family ResidenceResidential
$334,660
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 Aug 30, 2026

9405 KNOLLTOP RD

UNION, IL 60180
3
Beds
0
Baths
1.14 ac
Lot SizeThe size of the land the home sits on, from county records.
1978
Year BuiltThe year the home was originally built, according to county records.
8
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$335K
$283K low$386K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$6,298 (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.$110,648 (2024)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$18,764
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$91,884
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$100,062
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$331,944

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
CountyMcHenry
HeatingThe type of heating system in the home.None

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 · 5.0 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%

Owner Tools

Do you own this home?
Claim this home

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

9405 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 88% 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
$165K$756K

This home is worth more than 37% 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$334,660
CheaperTypical $396,996Pricier

Pricier than 37% of homes nearby

Lot size1.14 ac
SmallerTypical 1.17 acBigger

Bigger than 47% of homes nearby

Year built1978
OlderTypical 1975Newer

Newer than 62% of homes nearby

How 9405 Knolltop Rd ranks against every home in each area.
MeasureThis homeUnion 60180McHenry County
Estimated valuepricier than$334,66037% of homes42% of homes
Lot sizebigger than1.14 ac47% of homes88% of homes
Year builtnewer than197862% of homes37% of homes

About 9405 Knolltop Rd

How much is 9405 Knolltop Rd, Union, IL worth?

The TopHap Estimate for 9405 Knolltop Rd, Union, IL is $334,660 as of Aug 30, 2026. The likely range is $283,047 to $386,273. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 9405 Knolltop Rd, Union, IL last sell?

9405 Knolltop Rd, Union, IL last sold on Sep 20, 1977, according to the county's recorded deed.

When was 9405 Knolltop Rd, Union, IL built?

9405 Knolltop Rd, Union, IL was built in 1978, making it 48 years old.

What schools serve 9405 Knolltop Rd, Union, IL?

9405 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 9405 Knolltop Rd, Union, IL compare to other homes in Union 60180?

Among the 652 homes in Union 60180, it is worth more than 37% of them ($334,660 against a typical $396,996), its lot is bigger than 47% of them (1.14 ac against a typical 1.17 ac) and it is newer than 62% of them (1978 against a typical 1975). Measured against all of McHenry County, it is worth more than 42% 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 9405 Knolltop Rd, Union, IL?

The 2024 property tax bill for 9405 Knolltop Rd, Union, IL was $6,298. The county assessed it at $110,648.

More homes on Knolltop Rd

Closest homes

More homes in Union 60180

Assigned schools

Explore the area

See this home in context

Open 9405 Knolltop Rd on TopHap’s interactive map to compare it against every sale nearby, overlay school zones and flood risk, and run a CMA.

Open in map
A flyover of TopHap's photorealistic 3D map, with recorded sale prices pinned to homes
Search any address, city, zip, or county…3D$1.9M$6.25MOpen in map