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Single Family ResidenceResidential
$753,829$375 / 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 83How 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

521 ELM AVE

UPPER DARBY, PA 19082
6
Beds
2.5
Baths
2,010 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.
0.37 ac
Lot SizeThe size of the land the home sits on, from county records.
1920
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
10
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$754K
$627K low$881K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$15,735 (2026)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$403,050 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$159,730
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$243,320
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$403,050
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$403,050

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.Victorian
CountyDELAWARE
Lot (acres)The size of the land the home sits on, from county records.0.37
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
HeatingThe type of heating system in the home.Central
FireplaceWhether the home has a fireplace, and what kind.Yes
PoolWhether the property has a pool, and what kind, such as in-ground.No

Assigned SchoolsThe public schools this address is zoned for. Boundaries change, so confirm with the district before you count on it.

E
Swarthmore-rutledge SchoolA+
Elementary · Grades KG–5 · 0.4 mi
M
Strath Haven Middle SchoolA
Middle · Grades 6–8 · 1.3 mi
H
Strath Haven High SchoolA+
High · Grades 9–12 · 1.4 mi

District: Wallingford-Swarthmore School District

Neighborhood · ZIP 19082These 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.115
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.99
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.78

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.19%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.17%
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.41,135
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.16,040 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$59,070
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$74,967
Average tempThe average temperature here across a full year.55°F
Annual precipHow much rain and melted snow falls here in a typical year.46 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.56%

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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 Elm 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.

  • Among the most valuable homes in Upper Darby 19082
  • Among the highest price per square foot in Upper Darby 19082
  • Bigger than 91% of homes in Upper Darby 19082
  • Among the largest lots in Upper Darby 19082
  • Older than 89% of homes in Upper Darby 19082

What homes are worth in Upper Darby 19082

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

This home
$50K$416K

This home is worth more than almost all homes in Upper Darby 19082.

How it measures up in Upper Darby 19082

The dot is this home. The mark in the middle is the typical home in Upper Darby 19082.

Estimated value$753,829
CheaperTypical $186,349Pricier

Pricier than almost all homes nearby

Price per ft²$375
CheaperTypical $152Pricier

Pricier than almost all homes nearby

Living area2,010 ft²
SmallerTypical 1,286 ft²Bigger

Bigger than 91% of homes nearby

Lot size0.37 ac
SmallerTypical 1,742 ft²Bigger

Bigger than almost all homes nearby

Year built1920
OlderTypical 1929Newer

Newer than 11% of homes nearby

How 521 Elm Ave ranks against every home in each area.
MeasureThis homeSwarthmoreUpper Darby 19082Delaware County
Estimated valuepricier than$753,82960% of homesalmost all homes83% of homes
Price per ft²pricier than$37591% of homesalmost all homes92% of homes
Living areabigger than2,010 ft²40% of homes91% of homes68% of homes
Lot sizebigger than0.37 ac74% of homesalmost all homes81% of homes
Year builtnewer than192028% of homes11% of homes11% of homes

About 521 Elm Ave

How much is 521 Elm Ave, Upper Darby, PA worth?

The TopHap Estimate for 521 Elm Ave, Upper Darby, PA is $753,829 as of Jul 14, 2026. The likely range is $626,713 to $880,945. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 521 Elm Ave, Upper Darby, PA last sell?

521 Elm Ave, Upper Darby, PA last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 521 Elm Ave, Upper Darby, PA?

521 Elm Ave, Upper Darby, PA has 6 bedrooms, 2.5 bathrooms, 2,010 square feet of living space and a 0.37-acre lot.

When was 521 Elm Ave, Upper Darby, PA built?

521 Elm Ave, Upper Darby, PA was built in 1920, making it 106 years old. It is a victorian home. The building has 2 stories.

What schools serve 521 Elm Ave, Upper Darby, PA?

521 Elm Ave, Upper Darby, PA is assigned to Swarthmore-rutledge School (elementary), rated A+; Strath Haven Middle School (middle), rated A; Strath Haven High School (high), rated A+. All sit in Wallingford-Swarthmore School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 521 Elm Ave, Upper Darby, PA compare to other homes in Upper Darby 19082?

Among the 11,486 homes in Upper Darby 19082, it is worth more than almost all of them ($753,829 against a typical $186,349), its price per square foot is higher than almost all of them ($375 against a typical $152), it is bigger than 91% of them (2,010 ft² against a typical 1,286 ft²), its lot is bigger than almost all of them (0.37 ac against a typical 1,742 ft²) and it is newer than 11% of them (1920 against a typical 1929). Measured against all of Delaware County, it is worth more than 83% 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 Elm Ave, Upper Darby, PA?

The 2026 property tax bill for 521 Elm Ave, Upper Darby, PA was $15,735. The county assessed it at $403,050.

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