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Single Family ResidentialResidential
$210,149$140 / 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 94How 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

504 MASON ST

OTTAWA, IL 61350
0
Baths
1,503 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.
0.41 ac
Lot SizeThe size of the land the home sits on, from county records.
1941
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.

Valuation

$210K
$197K low$224K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$5,827 (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.$63,857 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$17,040
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$46,817
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$58,854
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$191,571

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.42
38
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
8
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.7 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 Residential
CountyLASALLE
Lot (acres)The size of the land the home sits on, from county records.0.41
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.

E
McKinley Elementary SchoolA-
Elementary · Grades KG–4 · 0.5 mi
M
Shepherd Middle SchoolC-
Middle · Grades 7–8 · 0.6 mi
H
Ottawa Township High SchoolD+
High · Grades 9–12 · 1.0 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

504 Mason 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.

  • Has a bigger lot than 80% 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
$73K$546K

This home is worth more than 56% 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$210,149
CheaperTypical $197,417Pricier

Pricier than 56% of homes nearby

Price per ft²$140
CheaperTypical $147Pricier

Pricier than 44% of homes nearby

Living area1,503 ft²
SmallerTypical 1,406 ft²Bigger

Bigger than 56% of homes nearby

Lot size0.41 ac
SmallerTypical 0.19 acBigger

Bigger than 80% of homes nearby

Year built1941
OlderTypical 1954Newer

Newer than 40% of homes nearby

How 504 Mason St ranks against every home in each area.
MeasureThis homeOttawa 61350LaSalle County
Estimated valuepricier than$210,14956% of homes62% of homes
Price per ft²pricier than$14044% of homes58% of homes
Living areabigger than1,503 ft²56% of homes57% of homes
Lot sizebigger than0.41 ac80% of homes73% of homes
Year builtnewer than194140% of homes41% of homes

About 504 Mason St

How much is 504 Mason St, Ottawa, IL worth?

The TopHap Estimate for 504 Mason St, Ottawa, IL is $210,149 as of Sep 24, 2026. The likely range is $196,633 to $223,665. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 504 Mason St, Ottawa, IL last sell?

504 Mason St, Ottawa, IL last sold on Jan 20, 2023, according to the county's recorded deed.

How big is 504 Mason St, Ottawa, IL?

504 Mason St, Ottawa, IL has 1,503 square feet of living space and a 0.41-acre lot.

When was 504 Mason St, Ottawa, IL built?

504 Mason St, Ottawa, IL was built in 1941, making it 85 years old. The building has 1 story.

What schools serve 504 Mason St, Ottawa, IL?

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

How does 504 Mason St, Ottawa, IL compare to other homes in Ottawa 61350?

Among the 8,886 homes in Ottawa 61350, it is worth more than 56% of them ($210,149 against a typical $197,417), its price per square foot is higher than 44% of them ($140 against a typical $147), it is bigger than 56% of them (1,503 ft² against a typical 1,406 ft²), its lot is bigger than 80% of them (0.41 ac against a typical 0.19 ac) and it is newer than 40% of them (1941 against a typical 1954). Measured against all of LaSalle County, it is worth more than 62% 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 504 Mason St, Ottawa, IL?

The 2025 property tax bill for 504 Mason St, Ottawa, IL was $5,827. The county assessed it at $63,857.

More homes on Mason St

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Assigned schools

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