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Single Family ResidentialResidential
$332,747$215 / 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 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

1321 WILLIAM ST

SYCAMORE, IL 60178
3
Beds
1
Baths
1,549 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.
0.23 ac
Lot SizeThe size of the land the home sits on, from county records.
1991
Year BuiltThe year the home was originally built, according to county records.
6
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$333K
$304K low$362K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$6,825 (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.$93,692 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$20,964
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$72,728
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$88,089
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$281,076

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residential
CountyDeKalb
Lot (acres)The size of the land the home sits on, from county records.0.23
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
FoundationWhat the home is built on, such as a concrete slab, a crawl space, or a basement.Retaining Wall
RoofThe main material covering the roof, such as asphalt shingle or tile.Composition Shingle
HeatingThe type of heating system in the home.Forced Air
CoolingThe type of cooling or air conditioning in the home.Yes
FireplaceWhether the home has a fireplace, and what kind.Yes
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Attached

Transaction History(4)

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
North Elementary SchoolB
Elementary · Grades KG–5 · 0.5 mi
M
Sycamore Middle SchoolB-
Middle · Grades 6–8 · 0.8 mi
H
Sycamore High SchoolB+
High · Grades 9–12 · 1.3 mi

District: Sycamore Community Unit School District 427

Neighborhood · ZIP 60178These 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.69
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.88
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.51

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.97%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.27%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.6.9%
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.23,227
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.340 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$88,175
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$103,851
Average tempThe average temperature here across a full year.48°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.52%

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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

1321 William 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 more than 66% of homes in DeKalb County
  • Costs less per square foot than 67% of homes in Sycamore 60178
  • Bigger than 66% of homes in DeKalb County

What homes are worth in Sycamore 60178

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

This home
$170K$649K

This home is worth more than 54% of homes in Sycamore 60178.

How it measures up in Sycamore 60178

The dot is this home. The mark in the middle is the typical home in Sycamore 60178.

Estimated value$332,747
CheaperTypical $318,540Pricier

Pricier than 54% of homes nearby

Price per ft²$215
CheaperTypical $235Pricier

Pricier than 33% of homes nearby

Living area1,549 ft²
SmallerTypical 1,323 ft²Bigger

Bigger than 65% of homes nearby

Lot size0.23 ac
SmallerTypical 0.25 acBigger

Bigger than 39% of homes nearby

Year built1991
OlderTypical 1990Newer

Newer than 51% of homes nearby

How 1321 William St ranks against every home in each area.
MeasureThis homeSycamore 60178DeKalb County
Estimated valuepricier than$332,74754% of homes66% of homes
Price per ft²pricier than$21533% of homes33% of homes
Living areabigger than1,549 ft²65% of homes66% of homes
Lot sizebigger than0.23 ac39% of homes39% of homes
Year builtnewer than199151% of homes46% of homes

About 1321 William St

How much is 1321 William St, Sycamore, IL worth?

The TopHap Estimate for 1321 William St, Sycamore, IL is $332,747 as of Sep 24, 2026. The likely range is $303,833 to $361,661. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 1321 William St, Sycamore, IL last sell?

1321 William St, Sycamore, IL last sold on Sep 4, 2018, according to the county's recorded deed.

How big is 1321 William St, Sycamore, IL?

1321 William St, Sycamore, IL has 3 bedrooms, 1 bathrooms, 1,549 square feet of living space and a 0.23-acre lot.

When was 1321 William St, Sycamore, IL built?

1321 William St, Sycamore, IL was built in 1991, making it 35 years old.

What schools serve 1321 William St, Sycamore, IL?

1321 William St, Sycamore, IL is assigned to North Elementary School (elementary), rated B; Sycamore Middle School (middle), rated B-; Sycamore High School (high), rated B+. All sit in Sycamore Community Unit School District 427. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 1321 William St, Sycamore, IL compare to other homes in Sycamore 60178?

Among the 7,687 homes in Sycamore 60178, it is worth more than 54% of them ($332,747 against a typical $318,540), its price per square foot is higher than 33% of them ($215 against a typical $235), it is bigger than 65% of them (1,549 ft² against a typical 1,323 ft²), its lot is bigger than 39% of them (0.23 ac against a typical 0.25 ac) and it is newer than 51% of them (1991 against a typical 1990). Measured against all of DeKalb County, it is worth more than 66% 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 1321 William St, Sycamore, IL?

The 2025 property tax bill for 1321 William St, Sycamore, IL was $6,825. The county assessed it at $93,692.

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