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Single Family ResidenceResidential
$937,501$394 / 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 86How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Jul 14, 2026
Last sold for $926,500 on Jul 9, 2026

831 WILLIAM ST

RIVER FOREST, IL 60305
3
Beds
1
Baths
2,380 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.
0.22 ac
Lot SizeThe size of the land the home sits on, from county records.
1915
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
9
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$938K
$811K low$1.1M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$926,500 · Jul 9, 2026
Est. Owner EquityRoughly how much of the home's value the owner would keep after paying off known loans. It is our estimate minus the loans still owed.$196,501
Est. Lendable EquityThe part of the owner's equity a lender would typically let them borrow against — about 80% of their equity.$157,201
Loan-to-ValueHow much is still owed on the home compared to what it is worth. 80% means loans equal 80% of our estimate, so it shifts when the estimate does.80%
1st MortgageA loan still believed to be open on this home, in the order lenders get repaid. The first position is paid back before the second.$741,000
JPMORGAN CHASE BANK · 6.53% 2 · recorded Jul 9, 2026

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$17,919 (2023)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$71,422 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$11,280
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$60,142
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$71,422
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$714,220

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.45
45
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.
69
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.
45
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.
Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.11 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.30%

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 Residence
CountyCOOK
Effective Year BuiltAn adjusted build year that accounts for condition and major remodels. A big renovation can make a home count as newer than it is.1916
Lot (acres)The size of the land the home sits on, from county records.0.22
ConstructionThe main material the home's frame and walls are built from.Masonry/Concrete Masonry Units (Cmus)
RoofThe main material covering the roof, such as asphalt shingle or tile.Tile
HeatingThe type of heating system in the home.Hot Water
CoolingThe type of cooling or air conditioning in the home.Central
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
PoolWhether the property has a pool, and what kind, such as in-ground.No

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.

M
Roosevelt SchoolA
Middle · Grades 5–8 · 0.3 mi
E
Willard Elementary SchoolA+
Elementary · Grades PK–4 · 0.7 mi
H
Oak Park & River Forest High SchoolA+
High · Grades 9–12 · 1.1 mi

District: Oak Park and River Forest District 200

Neighborhood · ZIP 60305These 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.29
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.133
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.45

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.94%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.31%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.1.3%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.7%
PopulationHow many people live in this area.11,189
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.4,804 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$151,502
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$232,452
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%

Ownership

OccupancyWhether the owner appears to live here or somewhere else. It is inferred from the mailing address on record.Absentee owner
Company ownedWhether the owner is a company or trust rather than a person.No

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

831 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 94% of homes in Cook County
  • Costs more per square foot than 89% of homes in Cook County
  • Bigger than 80% of homes in Cook County
  • Has a bigger lot than 67% of homes in Cook County
  • Older than 86% of homes in River Forest 60305

What homes are worth in River Forest 60305

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

This home
$140K$2.1M

This home is worth more than 62% of homes in River Forest 60305.

How it measures up in River Forest 60305

The dot is this home. The mark in the middle is the typical home in River Forest 60305.

Estimated value$937,501
CheaperTypical $801,174Pricier

Pricier than 62% of homes nearby

Price per ft²$394
CheaperTypical $369Pricier

Pricier than 63% of homes nearby

Living area2,380 ft²
SmallerTypical 2,209 ft²Bigger

Bigger than 56% of homes nearby

Lot size0.22 ac
SmallerTypical 0.23 acBigger

Bigger than 39% of homes nearby

Year built1915
OlderTypical 1943Newer

Newer than 14% of homes nearby

How 831 William St ranks against every home in each area.
MeasureThis homeRiver Forest 60305Cook County
Estimated valuepricier than$937,50162% of homes94% of homes
Price per ft²pricier than$39463% of homes89% of homes
Living areabigger than2,380 ft²56% of homes80% of homes
Lot sizebigger than0.22 ac39% of homes67% of homes
Year builtnewer than191514% of homes14% of homes

About 831 William St

How much is 831 William St, River Forest, IL worth?

The TopHap Estimate for 831 William St, River Forest, IL is $937,501 as of Jul 14, 2026. The likely range is $810,826 to $1,064,176. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 831 William St, River Forest, IL last sell?

831 William St, River Forest, IL last sold on Jul 9, 2026 for $926,500, according to the county's recorded deed.

How big is 831 William St, River Forest, IL?

831 William St, River Forest, IL has 3 bedrooms, 1 bathrooms, 2,380 square feet of living space and a 0.22-acre lot.

When was 831 William St, River Forest, IL built?

831 William St, River Forest, IL was built in 1915, making it 111 years old. The building has 2 stories.

What schools serve 831 William St, River Forest, IL?

831 William St, River Forest, IL is assigned to Roosevelt School (middle), rated A; Willard Elementary School (elementary), rated A+; Oak Park & River Forest High School (high), rated A+. All sit in Oak Park and River Forest District 200. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 831 William St, River Forest, IL compare to other homes in River Forest 60305?

Among the 4,095 homes in River Forest 60305, it is worth more than 62% of them ($937,501 against a typical $801,174), its price per square foot is higher than 63% of them ($394 against a typical $369), it is bigger than 56% of them (2,380 ft² against a typical 2,209 ft²), its lot is bigger than 39% of them (0.22 ac against a typical 0.23 ac) and it is newer than 14% of them (1915 against a typical 1943). Measured against all of Cook County, it is worth more than 94% 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 831 William St, River Forest, IL?

The 2023 property tax bill for 831 William St, River Forest, IL was $17,919. The county assessed it at $71,422.

More homes on William St

Closest homes

More homes in River Forest 60305

Assigned schools

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