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Single Family ResidenceResidential
$328,411$346 / 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

21 ONAWAY PL

NEW CASTLE, DE 19720
3
Beds
1
Baths
950 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.
0.14 ac
Lot SizeThe size of the land the home sits on, from county records.
1952
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
6
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$328K
$269K low$388K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$1,939 (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.$250,500 (2025)
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$32,900

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.45
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
17
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.
87
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
49
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.Ranch
CountyNew Castle
Lot (acres)The size of the land the home sits on, from county records.0.14
FoundationWhat the home is built on, such as a concrete slab, a crawl space, or a basement.Mat/Raft Foundation (Slab)
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Forced Air

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
Calvin R. McCullough Middle SchoolF
Middle · Grades 6–8 · 0.2 mi
E
Harry O. Eisenberg Elementary SchoolC-
Elementary · Grades KG–5 · 0.7 mi
H
William Penn High SchoolC-
High · Grades 9–12 · 2.6 mi

District: Colonial School District

Neighborhood · ZIP 19720These 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.92
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.92
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.72

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.15%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.10%
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.62,421
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,200 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$75,145
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$95,209
Average tempThe average temperature here across a full year.54°F
Annual precipHow much rain and melted snow falls here in a typical year.44 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.70%

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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

21 Onaway Pl 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.

  • Costs more per square foot than 98% of homes in New Castle 19720
  • Smaller than 94% of homes in New Castle County
  • Has a smaller lot than 71% of homes in New Castle 19720
  • Older than 76% of homes in New Castle County

What homes are worth in New Castle 19720

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

This home
$142K$620K

This home is worth more than 62% of homes in New Castle 19720.

How it measures up in New Castle 19720

The dot is this home. The mark in the middle is the typical home in New Castle 19720.

Estimated value$328,411
CheaperTypical $294,809Pricier

Pricier than 62% of homes nearby

Price per ft²$346
CheaperTypical $212Pricier

Pricier than 98% of homes nearby

Living area950 ft²
SmallerTypical 1,376 ft²Bigger

Bigger than 12% of homes nearby

Lot size0.14 ac
SmallerTypical 0.16 acBigger

Bigger than 29% of homes nearby

Year built1952
OlderTypical 1965Newer

Newer than 27% of homes nearby

How 21 Onaway Pl ranks against every home in each area.
MeasureThis homeNew Castle 19720New Castle County
Estimated valuepricier than$328,41162% of homes36% of homes
Price per ft²pricier than$34698% of homes96% of homes
Living areabigger than950 ft²12% of homes6% of homes
Lot sizebigger than0.14 ac29% of homes31% of homes
Year builtnewer than195227% of homes24% of homes

About 21 Onaway Pl

How much is 21 Onaway Pl, New Castle, DE worth?

The TopHap Estimate for 21 Onaway Pl, New Castle, DE is $328,411 as of Sep 24, 2026. The likely range is $269,193 to $387,629. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Onaway Pl, New Castle, DE last sell?

21 Onaway Pl, New Castle, DE last sold on Jul 9, 2025, according to the county's recorded deed.

How big is 21 Onaway Pl, New Castle, DE?

21 Onaway Pl, New Castle, DE has 3 bedrooms, 1 bathrooms, 950 square feet of living space and a 0.14-acre lot.

When was 21 Onaway Pl, New Castle, DE built?

21 Onaway Pl, New Castle, DE was built in 1952, making it 74 years old. It is a ranch home. The building has 1 story.

What schools serve 21 Onaway Pl, New Castle, DE?

21 Onaway Pl, New Castle, DE is assigned to Calvin R. McCullough Middle School (middle), rated F; Harry O. Eisenberg Elementary School (elementary), rated C-; William Penn High School (high), rated C-. All sit in Colonial School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Onaway Pl, New Castle, DE compare to other homes in New Castle 19720?

Among the 18,903 homes in New Castle 19720, it is worth more than 62% of them ($328,411 against a typical $294,809), its price per square foot is higher than 98% of them ($346 against a typical $212), it is bigger than 12% of them (950 ft² against a typical 1,376 ft²), its lot is bigger than 29% of them (0.14 ac against a typical 0.16 ac) and it is newer than 27% of them (1952 against a typical 1965). Measured against all of New Castle County, it is worth more than 36% 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 21 Onaway Pl, New Castle, DE?

The 2025 property tax bill for 21 Onaway Pl, New Castle, DE was $1,939. The county assessed it at $250,500.

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