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Single Family ResidenceResidential
$159,264$151 / 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 88How 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

521 S 20TH ST

COLLINSVILLE, OK 74021
1
Baths
1,056 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.
0.33 ac
Lot SizeThe size of the land the home sits on, from county records.
1955
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.

Valuation

$159K
$141K low$178K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$684 (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.$6,184 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$631
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$5,553
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$5,975
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$137,300

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.Ranch
CountyTulsa
Lot (acres)The size of the land the home sits on, from county records.0.33
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.Closed Piers
RoofThe main material covering the roof, such as asphalt shingle or tile.Composition Shingle
HeatingThe type of heating system in the home.Central
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
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Patio · 460 ft²Porch · 48 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.

M
Collinsville Middle SchoolB
Middle · Grades 7–8 · 0.5 mi
H
Collinsville High SchoolB+
High · Grades 9–12 · 0.7 mi
E
Herald Elementary SchoolA
Elementary · Grades 1–2 · 1.6 mi

District: Collinsville Public Schools

Neighborhood · ZIP 74021These 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.55
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.84
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.33

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.96%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.19%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.8.6%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.2%
PopulationHow many people live in this area.21,984
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.321 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$83,446
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$102,133
Average tempThe average temperature here across a full year.60°F
Annual precipHow much rain and melted snow falls here in a typical year.41 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.62%

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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

521 S 20th 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 92% of homes in Collinsville 74021
  • Costs less per square foot than 69% of homes in Collinsville 74021
  • Smaller than 93% of homes in Collinsville 74021
  • Has a bigger lot than 80% of homes in Tulsa County
  • Older than 90% of homes in Collinsville 74021

What homes are worth in Collinsville 74021

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

This home
$106K$613K

This home is worth more than 8% of homes in Collinsville 74021.

How it measures up in Collinsville 74021

The dot is this home. The mark in the middle is the typical home in Collinsville 74021.

Estimated value$159,264
CheaperTypical $273,033Pricier

Pricier than 8% of homes nearby

Price per ft²$151
CheaperTypical $165Pricier

Pricier than 31% of homes nearby

Living area1,056 ft²
SmallerTypical 1,696 ft²Bigger

Bigger than 7% of homes nearby

Lot size0.33 ac
SmallerTypical 0.5 acBigger

Bigger than 44% of homes nearby

Year built1955
OlderTypical 2001Newer

Newer than 10% of homes nearby

How 521 S 20th St ranks against every home in each area.
MeasureThis homeCollinsville 74021Tulsa County
Estimated valuepricier than$159,2648% of homes24% of homes
Price per ft²pricier than$15131% of homes57% of homes
Living areabigger than1,056 ft²7% of homes15% of homes
Lot sizebigger than0.33 ac44% of homes80% of homes
Year builtnewer than195510% of homes26% of homes

About 521 S 20th St

How much is 521 S 20th St, Collinsville, OK worth?

The TopHap Estimate for 521 S 20th St, Collinsville, OK is $159,264 as of Sep 24, 2026. The likely range is $140,632 to $177,896. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

How big is 521 S 20th St, Collinsville, OK?

521 S 20th St, Collinsville, OK has 1 bathrooms, 1,056 square feet of living space and a 0.33-acre lot.

When was 521 S 20th St, Collinsville, OK built?

521 S 20th St, Collinsville, OK was built in 1955, making it 71 years old. It is a ranch home. The building has 1 story.

What schools serve 521 S 20th St, Collinsville, OK?

521 S 20th St, Collinsville, OK is assigned to Collinsville Middle School (middle), rated B; Collinsville High School (high), rated B+; Herald Elementary School (elementary), rated A. All sit in Collinsville Public Schools. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 521 S 20th St, Collinsville, OK compare to other homes in Collinsville 74021?

Among the 8,529 homes in Collinsville 74021, it is worth more than 8% of them ($159,264 against a typical $273,033), its price per square foot is higher than 31% of them ($151 against a typical $165), it is bigger than 7% of them (1,056 ft² against a typical 1,696 ft²), its lot is bigger than 44% of them (0.33 ac against a typical 0.5 ac) and it is newer than 10% of them (1955 against a typical 2001). Measured against all of Tulsa County, it is worth more than 24% 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 521 S 20th St, Collinsville, OK?

The 2025 property tax bill for 521 S 20th St, Collinsville, OK was $684. The county assessed it at $6,184.

More homes on S 20th St

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Assigned schools

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