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Duplex (2 Units, Any Combination)Residential
Last sold for $505,000 on Sep 19, 2023

20 UNION ST

PETERBOROUGH, NH 03458
3
Beds
3
Baths
2,510 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.
0.27 ac
Lot SizeThe size of the land the home sits on, from county records.
1880
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

Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$505,000 · Sep 19, 2023

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$8,509 (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.$261,800 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$78,900
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$182,900

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.53
63
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.
58
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
94
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
33
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.28 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.30%
FEMA Flood ZoneFEMA's flood zone for this address. Zones starting with A or V are high risk, and lenders usually require flood insurance there.minimal

Scores 0–100; higher = greater projected risk.

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Duplex (2 Units, Any Combination)
CountyHILLSBOROUGH
Lot (acres)The size of the land the home sits on, from county records.0.27
HeatingThe type of heating system in the home.Steam
CoolingThe type of cooling or air conditioning in the home.Yes
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(2)

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
Peterborough Elementary SchoolC+
Elementary · Grades PK–4 · 0.1 mi
M
South Meadow SchoolB-
Middle · Grades 5–8 · 2.0 mi
H
ConVal Regional High SchoolA
High · Grades 9–12 · 2.2 mi

District: Contoocook Valley School District

Neighborhood · ZIP 03458These 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.136
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.82
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.91%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.30%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.3.2%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.0.9%
PopulationHow many people live in this area.7,395
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.135 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$93,348
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$131,009
Average tempThe average temperature here across a full year.45°F
Annual precipHow much rain and melted snow falls here in a typical year.47 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.54%

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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

20 Union 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.

  • Bigger than 78% of homes in Hillsborough County
  • Has a smaller lot than 91% of homes in Peterborough 03458
  • Older than 97% of homes in Hillsborough County

How it measures up in Peterborough 03458

The dot is this home. The mark in the middle is the typical home in Peterborough 03458.

Living area2,510 ft²
SmallerTypical 1,862 ft²Bigger

Bigger than 77% of homes nearby

Lot size0.27 ac
SmallerTypical 1.27 acBigger

Bigger than 9% of homes nearby

Year built1880
OlderTypical 1975Newer

Newer than 12% of homes nearby

How 20 Union St ranks against every home in each area.
MeasureThis homePeterborough 03458Hillsborough County
Living areabigger than2,510 ft²77% of homes78% of homes
Lot sizebigger than0.27 ac9% of homes32% of homes
Year builtnewer than188012% of homes3% of homes

About 20 Union St

When did 20 Union St, Peterborough, NH last sell?

20 Union St, Peterborough, NH last sold on Sep 19, 2023 for $505,000, according to the county's recorded deed.

How big is 20 Union St, Peterborough, NH?

20 Union St, Peterborough, NH has 3 bedrooms, 3 bathrooms, 2,510 square feet of living space and a 0.27-acre lot.

When was 20 Union St, Peterborough, NH built?

20 Union St, Peterborough, NH was built in 1880, making it 146 years old. The building has 2 stories.

What schools serve 20 Union St, Peterborough, NH?

20 Union St, Peterborough, NH is assigned to Peterborough Elementary School (elementary), rated C+; South Meadow School (middle), rated B-; ConVal Regional High School (high), rated A. All sit in Contoocook Valley School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 20 Union St, Peterborough, NH compare to other homes in Peterborough 03458?

Among the 2,296 homes in Peterborough 03458, it is bigger than 77% of them (2,510 ft² against a typical 1,862 ft²), its lot is bigger than 9% of them (0.27 ac against a typical 1.27 ac) and it is newer than 12% of them (1880 against a typical 1975). 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 Union St, Peterborough, NH?

The 2025 property tax bill for 20 Union St, Peterborough, NH was $8,509. The county assessed it at $261,800.

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