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Single Family ResidenceResidential
$721,264$417 / 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 75How 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 UNION ST

CAMDEN, ME 04843
3
Beds
1
Baths
1,730 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.
0.16 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.
6
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$721K
$539K low$904K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$6,831 (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.$594,000 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$201,300
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$392,700

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
CountyKNOX
Lot (acres)The size of the land the home sits on, from county records.0.16
RoofThe main material covering the roof, such as asphalt shingle or tile.Wood Shingle
HeatingThe type of heating system in the home.Hot Water
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.

M
Camden-Rockport Middle SchoolA
Middle · Grades 5–8 · 0.6 mi
E
Camden-Rockport Elementary SchoolA+
Elementary · Grades PK–4 · 1.8 mi
H
Camden Hills Regional High SchoolA
High · Grades 9–12 · 1.9 mi

District: School Administrative District 28

Neighborhood · ZIP 04843These 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.76
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.51

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.78%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.42%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.8.2%
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.5,062
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.256 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$86,844
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$108,142
Average tempThe average temperature here across a full year.45°F
Annual precipHow much rain and melted snow falls here in a typical year.50 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.50%

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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 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.

  • Worth more than 79% of homes in Knox County
  • Costs more per square foot than 68% of homes in Knox County
  • Has a smaller lot than 94% of homes in Knox County
  • Older than 73% of homes in Knox County

What homes are worth in Camden 04843

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

This home
$326K$3.2M

This home is worth more than 45% of homes in Camden 04843.

How it measures up in Camden 04843

The dot is this home. The mark in the middle is the typical home in Camden 04843.

Estimated value$721,264
CheaperTypical $771,638Pricier

Pricier than 45% of homes nearby

Price per ft²$417
CheaperTypical $441Pricier

Pricier than 44% of homes nearby

Living area1,730 ft²
SmallerTypical 1,737 ft²Bigger

Bigger than 49% of homes nearby

Lot size0.16 ac
SmallerTypical 0.55 acBigger

Bigger than 10% of homes nearby

Year built1920
OlderTypical 1962Newer

Newer than 35% of homes nearby

How 21 Union St ranks against every home in each area.
MeasureThis homeCamden 04843Knox County
Estimated valuepricier than$721,26445% of homes79% of homes
Price per ft²pricier than$41744% of homes68% of homes
Living areabigger than1,730 ft²49% of homes62% of homes
Lot sizebigger than0.16 ac10% of homes6% of homes
Year builtnewer than192035% of homes27% of homes

About 21 Union St

How much is 21 Union St, Camden, ME worth?

The TopHap Estimate for 21 Union St, Camden, ME is $721,264 as of Sep 24, 2026. The likely range is $538,997 to $903,531. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Union St, Camden, ME last sell?

21 Union St, Camden, ME last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 21 Union St, Camden, ME?

21 Union St, Camden, ME has 3 bedrooms, 1 bathrooms, 1,730 square feet of living space and a 0.16-acre lot.

When was 21 Union St, Camden, ME built?

21 Union St, Camden, ME was built in 1920, making it 106 years old. It is a conventional home. The building has 2 stories.

What schools serve 21 Union St, Camden, ME?

21 Union St, Camden, ME is assigned to Camden-Rockport Middle School (middle), rated A; Camden-Rockport Elementary School (elementary), rated A+; Camden Hills Regional High School (high), rated A. All sit in School Administrative District 28. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Union St, Camden, ME compare to other homes in Camden 04843?

Among the 2,562 homes in Camden 04843, it is worth more than 45% of them ($721,264 against a typical $771,638), its price per square foot is higher than 44% of them ($417 against a typical $441), it is bigger than 49% of them (1,730 ft² against a typical 1,737 ft²), its lot is bigger than 10% of them (0.16 ac against a typical 0.55 ac) and it is newer than 35% of them (1920 against a typical 1962). Measured against all of Knox County, it is worth more than 79% 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 Union St, Camden, ME?

The 2025 property tax bill for 21 Union St, Camden, ME was $6,831. The county assessed it at $594,000.

More homes on Union St

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Assigned schools

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