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Duplex (2 Units, Any Combination)Residential
Last sold for $165,000 on Jul 10, 2018

21 LIMESTONE PL

UNION, ME 04862
3
Beds
2
Baths
3,592 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.
3.25 ac
Lot SizeThe size of the land the home sits on, from county records.
1900
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
7
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.$165,000 · Jul 10, 2018

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$5,847 (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.$439,600 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$69,800
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$369,800
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$295,600

Climate Risk

Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.197 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.51%
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.1 percent flood zone

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)
StyleThe architectural style of the home, such as ranch or colonial.Conventional
CountyKNOX
Effective Year BuiltAn adjusted build year that accounts for condition and major remodels. A big renovation can make a home count as newer than it is.1996
Lot (acres)The size of the land the home sits on, from county records.3.25
ConstructionThe main material the home's frame and walls are built from.Concrete
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
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Deck

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
Union Elementary SchoolC
Elementary · Grades PK–6 · 1.4 mi
H
Medomak Valley High SchoolC+
High · Grades 9–12 · 6.2 mi
M
Medomak Middle SchoolB-
Middle · Grades 7–8 · 6.4 mi

District: School Administrative District 40

Neighborhood · ZIP 04862These 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.85
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 100.63

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.28%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.13%
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.3,792
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.56 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$63,641
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$80,525
Average tempThe average temperature here across a full year.45°F
Annual precipHow much rain and melted snow falls here in a typical year.48 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 Limestone 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.

  • Bigger than 98% of homes in Union 04862
  • Has a bigger lot than 76% of homes in Knox County
  • Older than 82% of homes in Union 04862

How it measures up in Union 04862

The dot is this home. The mark in the middle is the typical home in Union 04862.

Living area3,592 ft²
SmallerTypical 1,232 ft²Bigger

Bigger than 98% of homes nearby

Lot size3.25 ac
SmallerTypical 3.5 acBigger

Bigger than 49% of homes nearby

Year built1900
OlderTypical 1985Newer

Newer than 18% of homes nearby

How 21 Limestone Pl ranks against every home in each area.
MeasureThis homeUnion 04862Knox County
Living areabigger than3,592 ft²98% of homes95% of homes
Lot sizebigger than3.25 ac49% of homes76% of homes
Year builtnewer than190018% of homes23% of homes

About 21 Limestone Pl

When did 21 Limestone Pl, Union, ME last sell?

21 Limestone Pl, Union, ME last sold on Jul 10, 2018 for $165,000, according to the county's recorded deed.

How big is 21 Limestone Pl, Union, ME?

21 Limestone Pl, Union, ME has 3 bedrooms, 2 bathrooms, 3,592 square feet of living space and a 3.25-acre lot.

When was 21 Limestone Pl, Union, ME built?

21 Limestone Pl, Union, ME was built in 1900, making it 126 years old. It is a conventional home. The building has 2 stories.

What schools serve 21 Limestone Pl, Union, ME?

21 Limestone Pl, Union, ME is assigned to Union Elementary School (elementary), rated C; Medomak Valley High School (high), rated C+; Medomak Middle School (middle), rated B-. All sit in School Administrative District 40. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Limestone Pl, Union, ME compare to other homes in Union 04862?

Among the 1,849 homes in Union 04862, it is bigger than 98% of them (3,592 ft² against a typical 1,232 ft²), its lot is bigger than 49% of them (3.25 ac against a typical 3.5 ac) and it is newer than 18% of them (1900 against a typical 1985). 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 Limestone Pl, Union, ME?

The 2025 property tax bill for 21 Limestone Pl, Union, ME was $5,847. The county assessed it at $439,600.

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