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Single Family ResidenceResidential
$261,120$302 / 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
Last sold for $160,000 on Nov 1, 2018

421 MAIN ST

UNION, NH 03887
2
Beds
1
Baths
865 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.
0.2 ac
Lot SizeThe size of the land the home sits on, from county records.
1890
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.

Valuation

$261K
$229K low$293K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$160,000 · Nov 1, 2018

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$2,145 (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.$246,300 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$56,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$190,300

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.34
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
6
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
55
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
92
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
20
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.
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.Single Family Residence
StyleThe architectural style of the home, such as ranch or colonial.Conventional
CountyCARROLL
Lot (acres)The size of the land the home sits on, from county records.0.20
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Forced Air With Air Conditioning
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
Paul Elementary SchoolD+
Elementary · Grades PK–8 · 4.5 mi
H
Spaulding High SchoolC+
High · Grades 9–12 · 12.3 mi

District: Rochester School District

Neighborhood · ZIP 03887These 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.112
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.85
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.113

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.84%
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.7.8%
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.2,684
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.120 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$88,525
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$95,590
Average tempThe average temperature here across a full year.44°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.52%

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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

421 Main 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 97% of homes in Union 03887
  • Costs more per square foot than 71% of homes in Union 03887
  • Smaller than 93% of homes in Union 03887
  • Has a smaller lot than 97% of homes in Union 03887
  • Older than 95% of homes in Carroll County

What homes are worth in Union 03887

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

This home
$234K$950K

This home is worth more than 3% of homes in Union 03887.

How it measures up in Union 03887

The dot is this home. The mark in the middle is the typical home in Union 03887.

Estimated value$261,120
CheaperTypical $441,483Pricier

Pricier than 3% of homes nearby

Price per ft²$302
CheaperTypical $265Pricier

Pricier than 71% of homes nearby

Living area865 ft²
SmallerTypical 1,615 ft²Bigger

Bigger than 7% of homes nearby

Lot size0.2 ac
SmallerTypical 1.2 acBigger

Bigger than 3% of homes nearby

Year built1890
OlderTypical 1982Newer

Newer than 7% of homes nearby

How 421 Main St ranks against every home in each area.
MeasureThis homeUnion 03887Carroll County
Estimated valuepricier than$261,1203% of homes5% of homes
Price per ft²pricier than$30271% of homes49% of homes
Living areabigger than865 ft²7% of homes14% of homes
Lot sizebigger than0.2 ac3% of homes5% of homes
Year builtnewer than18907% of homes5% of homes

About 421 Main St

How much is 421 Main St, Union, NH worth?

The TopHap Estimate for 421 Main St, Union, NH is $261,120 as of Sep 24, 2026. The likely range is $229,166 to $293,074. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 421 Main St, Union, NH last sell?

421 Main St, Union, NH last sold on Nov 1, 2018 for $160,000, according to the county's recorded deed.

How big is 421 Main St, Union, NH?

421 Main St, Union, NH has 2 bedrooms, 1 bathrooms, 865 square feet of living space and a 0.20-acre lot.

When was 421 Main St, Union, NH built?

421 Main St, Union, NH was built in 1890, making it 136 years old. It is a conventional home. The building has 1 story.

What schools serve 421 Main St, Union, NH?

421 Main St, Union, NH is assigned to Paul Elementary School (elementary), rated D+; Spaulding High School (high), rated C+. All sit in Rochester School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 421 Main St, Union, NH compare to other homes in Union 03887?

Among the 1,049 homes in Union 03887, it is worth more than 3% of them ($261,120 against a typical $441,483), its price per square foot is higher than 71% of them ($302 against a typical $265), it is bigger than 7% of them (865 ft² against a typical 1,615 ft²), its lot is bigger than 3% of them (0.2 ac against a typical 1.2 ac) and it is newer than 7% of them (1890 against a typical 1982). Measured against all of Carroll County, it is worth more than 5% 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 421 Main St, Union, NH?

The 2025 property tax bill for 421 Main St, Union, NH was $2,145. The county assessed it at $246,300.

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