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Single Family ResidenceResidential
$108,749$68 / 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 82How 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

518 KNOWLTON ST

ROCKFORD, IL 61102
3
Beds
1.5
Baths
1,604 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.
0.28 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.
1
StoriesHow many floors the home has above ground.
7
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
1
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$109K
$89K low$128K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$2,543 (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.$34,807 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$1,824
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$32,983
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$31,237
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$104,421

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.33
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
6
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
68
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
63
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
31
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.

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
StyleThe architectural style of the home, such as ranch or colonial.Bi-Level
CountyWINNEBAGO
Lot (acres)The size of the land the home sits on, from county records.0.28
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Yes
CoolingThe type of cooling or air conditioning in the home.Central
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
ViewThe type of view from the property, or another feature of the site that affects value.Alley
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Deck · 192 ft²

Transaction History(3)

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
Washington Elementary SchoolD
Elementary · Grades KG–5 · 0.1 mi
M
RESA Middle SchoolD
Middle · Grades 6–8 · 1.3 mi
H
Jefferson High SchoolF
High · Grades 9–12 · 4.9 mi

District: Rockford School District 205

Neighborhood · ZIP 61102These 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.129
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.87
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.41

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.89%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.8.4%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.23%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.4%
PopulationHow many people live in this area.17,742
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.531 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$49,970
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$60,941
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.52%

Owner Tools

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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

518 Knowlton 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 86% of homes in Winnebago County
  • Costs less per square foot than 92% of homes in Winnebago County
  • Bigger than 79% of homes in Swifft
  • Has a bigger lot than 75% of homes in Swifft
  • Newer than 90% of homes in Swifft

What homes are worth in Rockford 61102

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

This home
$38K$441K

This home is worth more than 54% of homes in Rockford 61102.

How it measures up in Rockford 61102

The dot is this home. The mark in the middle is the typical home in Rockford 61102.

Estimated value$108,749
CheaperTypical $100,836Pricier

Pricier than 54% of homes nearby

Price per ft²$68
CheaperTypical $80Pricier

Pricier than 36% of homes nearby

Living area1,604 ft²
SmallerTypical 1,399 ft²Bigger

Bigger than 64% of homes nearby

Lot size0.28 ac
SmallerTypical 0.25 acBigger

Bigger than 55% of homes nearby

Year built1991
OlderTypical 1949Newer

Newer than 84% of homes nearby

How 518 Knowlton St ranks against every home in each area.
MeasureThis homeSwifftRockford 61102Winnebago County
Estimated valuepricier than$108,74972% of homes54% of homes14% of homes
Price per ft²pricier than$6846% of homes36% of homes8% of homes
Living areabigger than1,604 ft²79% of homes64% of homes52% of homes
Lot sizebigger than0.28 ac75% of homes55% of homes50% of homes
Year builtnewer than199190% of homes84% of homes77% of homes

About 518 Knowlton St

How much is 518 Knowlton St, Rockford, IL worth?

The TopHap Estimate for 518 Knowlton St, Rockford, IL is $108,749 as of Sep 24, 2026. The likely range is $89,130 to $128,368. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 518 Knowlton St, Rockford, IL last sell?

518 Knowlton St, Rockford, IL last sold on Sep 10, 2018, according to the county's recorded deed.

How big is 518 Knowlton St, Rockford, IL?

518 Knowlton St, Rockford, IL has 3 bedrooms, 1.5 bathrooms, 1,604 square feet of living space and a 0.28-acre lot.

When was 518 Knowlton St, Rockford, IL built?

518 Knowlton St, Rockford, IL was built in 1991, making it 35 years old. It is a bi-level home. The building has 1 story.

What schools serve 518 Knowlton St, Rockford, IL?

518 Knowlton St, Rockford, IL is assigned to Washington Elementary School (elementary), rated D; RESA Middle School (middle), rated D; Jefferson High School (high), rated F. All sit in Rockford School District 205. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 518 Knowlton St, Rockford, IL compare to other homes in Rockford 61102?

Among the 5,908 homes in Rockford 61102, it is worth more than 54% of them ($108,749 against a typical $100,836), its price per square foot is higher than 36% of them ($68 against a typical $80), it is bigger than 64% of them (1,604 ft² against a typical 1,399 ft²), its lot is bigger than 55% of them (0.28 ac against a typical 0.25 ac) and it is newer than 84% of them (1991 against a typical 1949). Measured against all of Winnebago County, it is worth more than 14% 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 518 Knowlton St, Rockford, IL?

The 2025 property tax bill for 518 Knowlton St, Rockford, IL was $2,543. The county assessed it at $34,807.

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