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Single Family ResidenceResidential
$427,267$249 / 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 Oct 21, 2026
Last sold for $10,500 on Feb 11, 1965

12421 LONG GREEN PIKE

GLEN ARM, MD 21057
1
Baths
1,716 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.
0.71 ac
Lot SizeThe size of the land the home sits on, from county records.
1898
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
3
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$427K
$393K low$462K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$10,500 · Feb 11, 1965

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$2,301 (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.$364,067 (2025)
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$335,033
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$393,100

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.127 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.Single Family Residence
StyleThe architectural style of the home, such as ranch or colonial.Conventional
CountyBaltimore
Lot (acres)The size of the land the home sits on, from county records.0.71
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
RoofThe main material covering the roof, such as asphalt shingle or tile.Composition Shingle
HeatingThe type of heating system in the home.Forced Air
CoolingThe type of cooling or air conditioning in the home.Yes
FireplaceWhether the home has a fireplace, and what kind.Yes
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Detached
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.Shed · 240 ft²Porch · 176 ft²

Assigned SchoolsThe public schools this address is zoned for. Boundaries change, so confirm with the district before you count on it.

E
Carroll Manor Elementary SchoolA+
Elementary · Grades PK–5 · 2.8 mi
M
Pine Grove Middle SchoolC-
Middle · Grades 6–8 · 4.6 mi
H
Loch Raven High SchoolD
High · Grades 9–12 · 5.8 mi

District: Baltimore County Public Schools

Neighborhood · ZIP 21057These 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.74
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.88
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.47

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.95%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.31%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.3.8%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.0%
PopulationHow many people live in this area.4,918
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.295 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$156,114
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$167,405
Average tempThe average temperature here across a full year.55°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.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

12421 Long Green Pike 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 87% of homes in Glen Arm 21057
  • Smaller than 77% of homes in Glen Arm 21057
  • Has a smaller lot than 93% of homes in Glen Arm 21057
  • Among the oldest homes in Baltimore County

What homes are worth in Glen Arm 21057

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

This home
$287K$1.1M

This home is worth more than 13% of homes in Glen Arm 21057.

How it measures up in Glen Arm 21057

The dot is this home. The mark in the middle is the typical home in Glen Arm 21057.

Estimated value$427,267
CheaperTypical $641,168Pricier

Pricier than 13% of homes nearby

Price per ft²$249
CheaperTypical $262Pricier

Pricier than 40% of homes nearby

Living area1,716 ft²
SmallerTypical 2,379 ft²Bigger

Bigger than 23% of homes nearby

Lot size0.71 ac
SmallerTypical 1.5 acBigger

Bigger than 7% of homes nearby

Year built1898
OlderTypical 1969Newer

Newer than 6% of homes nearby

How 12421 Long Green Pike ranks against every home in each area.
MeasureThis homeGlen Arm 21057Baltimore County
Estimated valuepricier than$427,26713% of homes65% of homes
Price per ft²pricier than$24940% of homes63% of homes
Living areabigger than1,716 ft²23% of homes62% of homes
Lot sizebigger than0.71 ac7% of homes85% of homes
Year builtnewer than18986% of homesalmost no homes

About 12421 Long Green Pike

How much is 12421 Long Green Pike, Glen Arm, MD worth?

The TopHap Estimate for 12421 Long Green Pike, Glen Arm, MD is $427,267 as of Oct 21, 2026. The likely range is $392,544 to $461,990. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 12421 Long Green Pike, Glen Arm, MD last sell?

12421 Long Green Pike, Glen Arm, MD last sold on Feb 11, 1965 for $10,500, according to the county's recorded deed.

How big is 12421 Long Green Pike, Glen Arm, MD?

12421 Long Green Pike, Glen Arm, MD has 1 bathrooms, 1,716 square feet of living space and a 0.71-acre lot.

When was 12421 Long Green Pike, Glen Arm, MD built?

12421 Long Green Pike, Glen Arm, MD was built in 1898, making it 128 years old. It is a conventional home. The building has 2 stories.

What schools serve 12421 Long Green Pike, Glen Arm, MD?

12421 Long Green Pike, Glen Arm, MD is assigned to Carroll Manor Elementary School (elementary), rated A+; Pine Grove Middle School (middle), rated C-; Loch Raven High School (high), rated D. All sit in Baltimore County Public Schools. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 12421 Long Green Pike, Glen Arm, MD compare to other homes in Glen Arm 21057?

Among the 1,466 homes in Glen Arm 21057, it is worth more than 13% of them ($427,267 against a typical $641,168), its price per square foot is higher than 40% of them ($249 against a typical $262), it is bigger than 23% of them (1,716 ft² against a typical 2,379 ft²), its lot is bigger than 7% of them (0.71 ac against a typical 1.5 ac) and it is newer than 6% of them (1898 against a typical 1969). Measured against all of Baltimore County, it is worth more than 65% 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 12421 Long Green Pike, Glen Arm, MD?

The 2025 property tax bill for 12421 Long Green Pike, Glen Arm, MD was $2,301. The county assessed it at $364,067.

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