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Single Family ResidenceResidential
$512,101$256 / 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 95How 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 $370,000 on Oct 23, 2006

4421 BLACK ROCK RD

UPPERCO, MD 21155
1
Baths
2,000 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.
1 ac
Lot SizeThe size of the land the home sits on, from county records.
1801
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.

Valuation

$512K
$485K low$540K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$370,000 · Oct 23, 2006

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$3,378 (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.$278,700 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$99,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$179,700
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$262,100
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$278,700

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
CountyBaltimore
Lot (acres)The size of the land the home sits on, from county records.1.00
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.Metal
HeatingThe type of heating system in the home.Baseboard
CoolingThe type of cooling or air conditioning in the home.Yes
FireplaceWhether the home has a fireplace, and what kind.Yes
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.Porch · 126 ft²

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

E
Fifth District Elementary SchoolA+
Elementary · Grades PK–5 · 1.7 mi
H
Hereford High SchoolA-
High · Grades 9–12 · 7.8 mi
M
Hereford Middle SchoolA
Middle · Grades 6–8 · 8.2 mi

District: Baltimore County Public Schools

Neighborhood · ZIP 21155These 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.66
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.89
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.43

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.29%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.4.7%
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.2,841
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.130 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$113,439
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$154,298
Average tempThe average temperature here across a full year.53°F
Annual precipHow much rain and melted snow falls here in a typical year.45 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

4421 Black Rock Rd 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 77% of homes in Baltimore County
  • Costs more per square foot than 66% of homes in Baltimore County
  • Bigger than 74% of homes in Baltimore County
  • Has a bigger lot than 88% of homes in Baltimore County
  • Among the oldest homes in Baltimore County

What homes are worth in Upperco 21155

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

This home
$255K$1.4M

This home is worth more than 53% of homes in Upperco 21155.

How it measures up in Upperco 21155

The dot is this home. The mark in the middle is the typical home in Upperco 21155.

Estimated value$512,101
CheaperTypical $500,859Pricier

Pricier than 53% of homes nearby

Price per ft²$256
CheaperTypical $263Pricier

Pricier than 44% of homes nearby

Living area2,000 ft²
SmallerTypical 1,968 ft²Bigger

Bigger than 52% of homes nearby

Lot size1 ac
SmallerTypical 1.69 acBigger

Bigger than 32% of homes nearby

Year built1801
OlderTypical 1968Newer

Older than almost all homes nearby

How 4421 Black Rock Rd ranks against every home in each area.
MeasureThis homeUpperco 21155Baltimore County
Estimated valuepricier than$512,10153% of homes77% of homes
Price per ft²pricier than$25644% of homes66% of homes
Living areabigger than2,000 ft²52% of homes74% of homes
Lot sizebigger than1 ac32% of homes88% of homes
Year builtnewer than1801almost no homesalmost no homes

About 4421 Black Rock Rd

How much is 4421 Black Rock Rd, Upperco, MD worth?

The TopHap Estimate for 4421 Black Rock Rd, Upperco, MD is $512,101 as of Sep 24, 2026. The likely range is $484,636 to $539,566. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 4421 Black Rock Rd, Upperco, MD last sell?

4421 Black Rock Rd, Upperco, MD last sold on Oct 23, 2006 for $370,000, according to the county's recorded deed.

How big is 4421 Black Rock Rd, Upperco, MD?

4421 Black Rock Rd, Upperco, MD has 1 bathrooms, 2,000 square feet of living space and a 1.00-acre lot.

When was 4421 Black Rock Rd, Upperco, MD built?

4421 Black Rock Rd, Upperco, MD was built in 1801, making it 225 years old. It is a conventional home. The building has 2 stories.

What schools serve 4421 Black Rock Rd, Upperco, MD?

4421 Black Rock Rd, Upperco, MD is assigned to Fifth District Elementary School (elementary), rated A+; Hereford High School (high), rated A-; Hereford Middle School (middle), rated A. All sit in Baltimore County Public Schools. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 4421 Black Rock Rd, Upperco, MD compare to other homes in Upperco 21155?

Among the 988 homes in Upperco 21155, it is worth more than 53% of them ($512,101 against a typical $500,859), its price per square foot is higher than 44% of them ($256 against a typical $263), it is bigger than 52% of them (2,000 ft² against a typical 1,968 ft²), its lot is bigger than 32% of them (1 ac against a typical 1.69 ac) and it is newer than almost none of them (1801 against a typical 1968). Measured against all of Baltimore County, it is worth more than 77% 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 4421 Black Rock Rd, Upperco, MD?

The 2025 property tax bill for 4421 Black Rock Rd, Upperco, MD was $3,378. The county assessed it at $278,700.

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