Skip to content
Skip to content
TopHapOpen in map
Single Family ResidenceResidential
$408,706$426 / 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 96How 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

20 RIVERDALE AVE

DOVER, NH 03820
3
Beds
1
Baths
960 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.
0.4 ac
Lot SizeThe size of the land the home sits on, from county records.
1959
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
5
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
1
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$409K
$394K low$423K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$7,516 (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.$381,900 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$170,200
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$211,700
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$351,880

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
CountySTRAFFORD
Lot (acres)The size of the land the home sits on, from county records.0.40
HeatingThe type of heating system in the home.Steam
CoolingThe type of cooling or air conditioning in the home.Yes
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

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
Garrison Elementary SchoolB+
Elementary · Grades KG–4 · 0.3 mi
H
Dover High SchoolC
High · Grades 9–12 · 1.4 mi
M
Dover Middle SchoolB-
Middle · Grades 5–8 · 1.4 mi

District: Dover School District

Neighborhood · ZIP 03820These 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.100
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.101
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.106

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.95%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.35%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.7.2%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.0.8%
PopulationHow many people live in this area.33,546
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,143 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$98,826
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$120,547
Average tempThe average temperature here across a full year.47°F
Annual precipHow much rain and melted snow falls here in a typical year.45 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.54%

Owner Tools

Do you own this home?
Claim this home

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

20 Riverdale 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 less than 82% of homes in Dover 03820
  • Costs more per square foot than 90% of homes in Strafford County
  • Smaller than 89% of homes in Dover 03820
  • Has a smaller lot than 65% of homes in Strafford County
  • Older than 72% of homes in Strafford County

What homes are worth in Dover 03820

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

This home
$214K$1.4M

This home is worth more than 18% of homes in Dover 03820.

How it measures up in Dover 03820

The dot is this home. The mark in the middle is the typical home in Dover 03820.

Estimated value$408,706
CheaperTypical $546,226Pricier

Pricier than 18% of homes nearby

Price per ft²$426
CheaperTypical $346Pricier

Pricier than 84% of homes nearby

Living area960 ft²
SmallerTypical 1,680 ft²Bigger

Bigger than 11% of homes nearby

Lot size0.4 ac
SmallerTypical 0.39 acBigger

Bigger than 51% of homes nearby

Year built1959
OlderTypical 1976Newer

Newer than 37% of homes nearby

How 20 Riverdale Ave ranks against every home in each area.
MeasureThis homeDover 03820Strafford County
Estimated valuepricier than$408,70618% of homes25% of homes
Price per ft²pricier than$42684% of homes90% of homes
Living areabigger than960 ft²11% of homes12% of homes
Lot sizebigger than0.4 ac51% of homes35% of homes
Year builtnewer than195937% of homes28% of homes

About 20 Riverdale Ave

How much is 20 Riverdale Ave, Dover, NH worth?

The TopHap Estimate for 20 Riverdale Ave, Dover, NH is $408,706 as of Sep 24, 2026. The likely range is $394,244 to $423,168. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 20 Riverdale Ave, Dover, NH last sell?

20 Riverdale Ave, Dover, NH last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 20 Riverdale Ave, Dover, NH?

20 Riverdale Ave, Dover, NH has 3 bedrooms, 1 bathrooms, 960 square feet of living space and a 0.40-acre lot.

When was 20 Riverdale Ave, Dover, NH built?

20 Riverdale Ave, Dover, NH was built in 1959, making it 67 years old. It is a ranch home. The building has 1 story.

What schools serve 20 Riverdale Ave, Dover, NH?

20 Riverdale Ave, Dover, NH is assigned to Garrison Elementary School (elementary), rated B+; Dover High School (high), rated C; Dover Middle School (middle), rated B-. All sit in Dover School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 20 Riverdale Ave, Dover, NH compare to other homes in Dover 03820?

Among the 9,553 homes in Dover 03820, it is worth more than 18% of them ($408,706 against a typical $546,226), its price per square foot is higher than 84% of them ($426 against a typical $346), it is bigger than 11% of them (960 ft² against a typical 1,680 ft²), its lot is bigger than 51% of them (0.4 ac against a typical 0.39 ac) and it is newer than 37% of them (1959 against a typical 1976). Measured against all of Strafford County, it is worth more than 25% 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 20 Riverdale Ave, Dover, NH?

The 2025 property tax bill for 20 Riverdale Ave, Dover, NH was $7,516. The county assessed it at $381,900.

More homes on Riverdale Ave

Closest homes

More homes in Dover 03820

Assigned schools

Explore the area

See this home in context

Open 20 Riverdale Ave on TopHap’s interactive map to compare it against every sale nearby, overlay school zones and flood risk, and run a CMA.

Open in map
A flyover of TopHap's photorealistic 3D map, with recorded sale prices pinned to homes
Search any address, city, zip, or county…3D$1.9M$6.25MOpen in map