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Single Family ResidentialResidential
$512,611$155 / 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 73How 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

420 E PROSPECT AVE

OTTAWA, IL 61350
2.5
Baths
3,304 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.
2.05 ac
Lot SizeThe size of the land the home sits on, from county records.
1889
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.

Valuation

$513K
$374K low$652K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$27,460 (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.$278,671 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$89,133
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$189,538
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$256,839
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$836,013

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.55
100
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
7
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
73
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.
28
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.197 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.Single Family Residential
CountyLASALLE
Lot (acres)The size of the land the home sits on, from county records.2.05
FireplaceWhether the home has a fireplace, and what kind.Yes
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.

H
Ottawa Township High SchoolD
High · Grades 9–12 · 0.4 mi
E
McKinley Elementary SchoolA-
Elementary · Grades KG–4 · 1.1 mi
M
Shepherd Middle SchoolC-
Middle · Grades 7–8 · 1.2 mi

District: Ottawa Elementary School District 141

Neighborhood · ZIP 61350These 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.114
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 100.46

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.91%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.14%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.15%
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.23,673
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.158 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$72,547
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$84,853
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.55%

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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

420 E Prospect Ave 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 97% of homes in Ottawa 61350
  • Costs more per square foot than 68% of homes in LaSalle County
  • Bigger than 98% of homes in Ottawa 61350
  • Has a bigger lot than 96% of homes in Ottawa 61350
  • Older than 96% of homes in Ottawa 61350

What homes are worth in Ottawa 61350

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

This home
$76K$530K

This home is worth more than 97% of homes in Ottawa 61350.

How it measures up in Ottawa 61350

The dot is this home. The mark in the middle is the typical home in Ottawa 61350.

Estimated value$512,611
CheaperTypical $197,477Pricier

Pricier than 97% of homes nearby

Price per ft²$155
CheaperTypical $146Pricier

Pricier than 58% of homes nearby

Living area3,304 ft²
SmallerTypical 1,403 ft²Bigger

Bigger than 98% of homes nearby

Lot size2.05 ac
SmallerTypical 0.19 acBigger

Bigger than 96% of homes nearby

Year built1889
OlderTypical 1953Newer

Newer than 4% of homes nearby

How 420 E Prospect Ave ranks against every home in each area.
MeasureThis homeOttawa 61350LaSalle County
Estimated valuepricier than$512,61197% of homes97% of homes
Price per ft²pricier than$15558% of homes68% of homes
Living areabigger than3,304 ft²98% of homes98% of homes
Lot sizebigger than2.05 ac96% of homes94% of homes
Year builtnewer than18894% of homes8% of homes

About 420 E Prospect Ave

How much is 420 E Prospect Ave, Ottawa, IL worth?

The TopHap Estimate for 420 E Prospect Ave, Ottawa, IL is $512,611 as of Sep 24, 2026. The likely range is $373,552 to $651,670. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 420 E Prospect Ave, Ottawa, IL last sell?

420 E Prospect Ave, Ottawa, IL last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 420 E Prospect Ave, Ottawa, IL?

420 E Prospect Ave, Ottawa, IL has 2.5 bathrooms, 3,304 square feet of living space and a 2.05-acre lot.

When was 420 E Prospect Ave, Ottawa, IL built?

420 E Prospect Ave, Ottawa, IL was built in 1889, making it 137 years old. The building has 2 stories.

What schools serve 420 E Prospect Ave, Ottawa, IL?

420 E Prospect Ave, Ottawa, IL is assigned to Ottawa Township High School (high), rated D; McKinley Elementary School (elementary), rated A-; Shepherd Middle School (middle), rated C-. All sit in Ottawa Elementary School District 141. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 420 E Prospect Ave, Ottawa, IL compare to other homes in Ottawa 61350?

Among the 8,886 homes in Ottawa 61350, it is worth more than 97% of them ($512,611 against a typical $197,477), its price per square foot is higher than 58% of them ($155 against a typical $146), it is bigger than 98% of them (3,304 ft² against a typical 1,403 ft²), its lot is bigger than 96% of them (2.05 ac against a typical 0.19 ac) and it is newer than 4% of them (1889 against a typical 1953). Measured against all of LaSalle County, it is worth more than 97% 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 420 E Prospect Ave, Ottawa, IL?

The 2025 property tax bill for 420 E Prospect Ave, Ottawa, IL was $27,460. The county assessed it at $278,671.

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