Skip to content
Skip to content
TopHapOpen in map
Single Family ResidenceResidential
$255,705$199 / 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 93How 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

6821 ALTER ST

BALTIMORE, MD 21207
2
Baths
1,287 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.
0.2 ac
Lot SizeThe size of the land the home sits on, from county records.
1952
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.

Valuation

$256K
$239K low$272K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$2,945 (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.$209,800 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$51,800
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$158,000
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$199,633
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$209,800

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.6 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.30%
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.0.20
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
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
Bedford Elementary SchoolC+
Elementary · Grades EE–5 · 0.8 mi
M
Pikesville Middle SchoolD+
Middle · Grades 6–8 · 1.9 mi
H
Woodlawn High SchoolD-
High · Grades 9–12 · 2.6 mi

District: Baltimore County Public Schools

Neighborhood · ZIP 21207These 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.103
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 100.45

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.93%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.18%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.15%
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.46,163
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.4,469 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$75,642
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$93,031
Average tempThe average temperature here across a full year.55°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%

Owner Tools

Do you own this home?
Claim this home

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

6821 Alter 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 79% of homes in Baltimore County
  • Costs less per square foot than 73% of homes in Baltimore County
  • Smaller than 65% of homes in Baltimore County
  • Has a bigger lot than 76% of homes in Gwynn Oak 21207
  • Older than 76% of homes in Baltimore County

What homes are worth in Gwynn Oak 21207

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

This home
$152K$459K

This home is worth more than 31% of homes in Gwynn Oak 21207.

How it measures up in Gwynn Oak 21207

The dot is this home. The mark in the middle is the typical home in Gwynn Oak 21207.

Estimated value$255,705
CheaperTypical $285,244Pricier

Pricier than 31% of homes nearby

Price per ft²$199
CheaperTypical $199Pricier

Pricier than 50% of homes nearby

Living area1,287 ft²
SmallerTypical 1,365 ft²Bigger

Bigger than 41% of homes nearby

Lot size0.2 ac
SmallerTypical 0.16 acBigger

Bigger than 76% of homes nearby

Year built1952
OlderTypical 1954Newer

Newer than 44% of homes nearby

How 6821 Alter St ranks against every home in each area.
MeasureThis homeGwynn Oak 21207Baltimore County
Estimated valuepricier than$255,70531% of homes21% of homes
Price per ft²pricier than$19950% of homes27% of homes
Living areabigger than1,287 ft²41% of homes35% of homes
Lot sizebigger than0.2 ac76% of homes60% of homes
Year builtnewer than195244% of homes24% of homes

About 6821 Alter St

How much is 6821 Alter St, Baltimore, MD worth?

The TopHap Estimate for 6821 Alter St, Baltimore, MD is $255,705 as of Sep 24, 2026. The likely range is $239,006 to $272,404. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

How big is 6821 Alter St, Baltimore, MD?

6821 Alter St, Baltimore, MD has 2 bathrooms, 1,287 square feet of living space and a 0.20-acre lot.

When was 6821 Alter St, Baltimore, MD built?

6821 Alter St, Baltimore, MD was built in 1952, making it 74 years old. It is a conventional home. The building has 2 stories.

What schools serve 6821 Alter St, Baltimore, MD?

6821 Alter St, Baltimore, MD is assigned to Bedford Elementary School (elementary), rated C+; Pikesville Middle School (middle), rated D+; Woodlawn 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 6821 Alter St, Baltimore, MD compare to other homes in Gwynn Oak 21207?

Among the 13,360 homes in Gwynn Oak 21207, it is worth more than 31% of them ($255,705 against a typical $285,244), its price per square foot is higher than 50% of them ($199 against a typical $199), it is bigger than 41% of them (1,287 ft² against a typical 1,365 ft²), its lot is bigger than 76% of them (0.2 ac against a typical 0.16 ac) and it is newer than 44% of them (1952 against a typical 1954). Measured against all of Baltimore County, it is worth more than 21% 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 6821 Alter St, Baltimore, MD?

The 2025 property tax bill for 6821 Alter St, Baltimore, MD was $2,945. The county assessed it at $209,800.

More homes on Alter St

Closest homes

More homes in Baltimore 21207

Assigned schools

Explore the area

See this home in context

Open 6821 Alter St on TopHap’s interactive map to compare it against every sale nearby, overlay school zones and flood risk, and run a CMA.

Open in map
A flyover of TopHap's photorealistic 3D map, with recorded sale prices pinned to homes
Search any address, city, zip, or county…3D$1.9M$6.25MOpen in map