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TownhouseResidential
$208,537$241 / 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 92How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Aug 30, 2026
Last sold for $85,000 on Mar 13, 2013

18 UNION ST

WESTMINSTER, MD 21157
1
Baths
864 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.
2,580 ft²
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.
2
StoriesHow many floors the home has above ground.

Valuation

$209K
$191K low$226K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$85,000 · Mar 13, 2013

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$2,291 (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.$146,600 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$60,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$86,600
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$136,367
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$146,600

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.41
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.
76
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
87
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
37
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.Townhouse
StyleThe architectural style of the home, such as ranch or colonial.Townhouse
CountyCARROLL
Lot (acres)The size of the land the home sits on, from county records.0.06
RoofThe main material covering the roof, such as asphalt shingle or tile.Metal
HeatingThe type of heating system in the home.Heat Pump
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
William Winchester Elementary SchoolB+
Elementary · Grades PK–5 · 0.3 mi
M
Westminster West Middle SchoolB+
Middle · Grades 6–8 · 0.4 mi
H
Winters Mill High SchoolA-
High · Grades 9–12 · 1.4 mi

District: Carroll County Public Schools

Neighborhood · ZIP 21157These 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.105
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.80
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.46

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.96%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.23%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.7.4%
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.41,419
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.542 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$105,034
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$121,439
Average tempThe average temperature here across a full year.53°F
Annual precipHow much rain and melted snow falls here in a typical year.44 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.57%

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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

18 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 less than 98% of homes in Westminster 21157
  • Costs less per square foot than 70% of homes in Carroll County
  • Smaller than 98% of homes in Westminster 21157
  • Has a smaller lot than 95% of homes in Westminster 21157
  • Older than 97% of homes in Westminster 21157

What homes are worth in Westminster 21157

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

This home
$209K$948K

This home is worth more than 2% of homes in Westminster 21157.

How it measures up in Westminster 21157

The dot is this home. The mark in the middle is the typical home in Westminster 21157.

Estimated value$208,537
CheaperTypical $445,770Pricier

Pricier than 2% of homes nearby

Price per ft²$241
CheaperTypical $261Pricier

Pricier than 35% of homes nearby

Living area864 ft²
SmallerTypical 1,740 ft²Bigger

Bigger than 2% of homes nearby

Lot size2,580 ft²
SmallerTypical 0.61 acBigger

Bigger than 5% of homes nearby

Year built1890
OlderTypical 1979Newer

Newer than 3% of homes nearby

How 18 Union St ranks against every home in each area.
MeasureThis homeWestminster 21157Carroll County
Estimated valuepricier than$208,5372% of homes2% of homes
Price per ft²pricier than$24135% of homes30% of homes
Living areabigger than864 ft²2% of homes2% of homes
Lot sizebigger than2,580 ft²5% of homes6% of homes
Year builtnewer than18903% of homes3% of homes

About 18 Union St

How much is 18 Union St, Westminster, MD worth?

The TopHap Estimate for 18 Union St, Westminster, MD is $208,537 as of Aug 30, 2026. The likely range is $191,021 to $226,053. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 18 Union St, Westminster, MD last sell?

18 Union St, Westminster, MD last sold on Mar 13, 2013 for $85,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 18 Union St, Westminster, MD?

18 Union St, Westminster, MD has 1 bathrooms, 864 square feet of living space and a 0.06-acre lot.

When was 18 Union St, Westminster, MD built?

18 Union St, Westminster, MD was built in 1890, making it 136 years old. It is a townhouse home. The building has 2 stories.

What schools serve 18 Union St, Westminster, MD?

18 Union St, Westminster, MD is assigned to William Winchester Elementary School (elementary), rated B+; Westminster West Middle School (middle), rated B+; Winters Mill High School (high), rated A-. All sit in Carroll County Public Schools. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 18 Union St, Westminster, MD compare to other homes in Westminster 21157?

Among the 12,568 homes in Westminster 21157, it is worth more than 2% of them ($208,537 against a typical $445,770), its price per square foot is higher than 35% of them ($241 against a typical $261), it is bigger than 2% of them (864 ft² against a typical 1,740 ft²), its lot is bigger than 5% of them (2,580 ft² against a typical 0.61 ac) and it is newer than 3% of them (1890 against a typical 1979). Measured against all of Carroll County, it is worth more than 2% 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 18 Union St, Westminster, MD?

The 2025 property tax bill for 18 Union St, Westminster, MD was $2,291. The county assessed it at $146,600.

More homes on Union St

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Assigned schools

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