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TownhouseResidential
$512,436$325 / 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 90How 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 $395,000 on Sep 8, 2021

817 PROMENADE LN

MOUNT AIRY, MD 21771
2.5
Baths
1,575 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.
3,302 ft²
Lot SizeThe size of the land the home sits on, from county records.
2005
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
1
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$512K
$461K low$564K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$395,000 · Sep 8, 2021

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$4,952 (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.$411,100 (2026)
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$377,400
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$444,800

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.0.08
RoofThe main material covering the roof, such as asphalt shingle or tile.Composition Shingle
HeatingThe type of heating system in the home.Forced Air With Air Conditioning
CoolingThe type of cooling or air conditioning in the home.Yes
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Attached
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.Patio · 162 ft²Porch · 156 ft²

Transaction History(5)

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
Parr's Ridge Elementary School
Elementary · Grades PK–2 · 0.9 mi
M
Mount Airy Middle SchoolB
Middle · Grades 6–8 · 1.0 mi
H
South Carroll High SchoolA-
High · Grades 9–12 · 8.0 mi

District: Carroll County Public Schools

Neighborhood · ZIP 21771These 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.59
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.82
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.37

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.97%
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.3.1%
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.32,505
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.382 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$151,406
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$162,296
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

817 Promenade Ln 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 67% of homes in Mount Airy 21771
  • Costs more per square foot than 81% of homes in Carroll County
  • Smaller than 75% of homes in Mount Airy 21771
  • Has a smaller lot than 94% of homes in Mount Airy 21771
  • Newer than 89% of homes in Mount Airy 21771

What homes are worth in Mount Airy 21771

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

This home
$318K$1.1M

This home is worth more than 33% of homes in Mount Airy 21771.

How it measures up in Mount Airy 21771

The dot is this home. The mark in the middle is the typical home in Mount Airy 21771.

Estimated value$512,436
CheaperTypical $605,835Pricier

Pricier than 33% of homes nearby

Price per ft²$325
CheaperTypical $281Pricier

Pricier than 75% of homes nearby

Living area1,575 ft²
SmallerTypical 2,194 ft²Bigger

Bigger than 25% of homes nearby

Lot size3,302 ft²
SmallerTypical 0.95 acBigger

Bigger than 6% of homes nearby

Year built2005
OlderTypical 1988Newer

Newer than 89% of homes nearby

How 817 Promenade Ln ranks against every home in each area.
MeasureThis homeMount Airy 21771Carroll County
Estimated valuepricier than$512,43633% of homes58% of homes
Price per ft²pricier than$32575% of homes81% of homes
Living areabigger than1,575 ft²25% of homes40% of homes
Lot sizebigger than3,302 ft²6% of homes8% of homes
Year builtnewer than200589% of homes89% of homes

About 817 Promenade Ln

How much is 817 Promenade Ln, Mount Airy, MD worth?

The TopHap Estimate for 817 Promenade Ln, Mount Airy, MD is $512,436 as of Sep 24, 2026. The likely range is $461,148 to $563,724. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 817 Promenade Ln, Mount Airy, MD last sell?

817 Promenade Ln, Mount Airy, MD last sold on Sep 8, 2021 for $395,000, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

How big is 817 Promenade Ln, Mount Airy, MD?

817 Promenade Ln, Mount Airy, MD has 2.5 bathrooms, 1,575 square feet of living space and a 0.08-acre lot.

When was 817 Promenade Ln, Mount Airy, MD built?

817 Promenade Ln, Mount Airy, MD was built in 2005, making it 21 years old. It is a townhouse home. The building has 1 story.

What schools serve 817 Promenade Ln, Mount Airy, MD?

817 Promenade Ln, Mount Airy, MD is assigned to Parr's Ridge Elementary School (elementary); Mount Airy Middle School (middle), rated B; South Carroll 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 817 Promenade Ln, Mount Airy, MD compare to other homes in Mount Airy 21771?

Among the 10,756 homes in Mount Airy 21771, it is worth more than 33% of them ($512,436 against a typical $605,835), its price per square foot is higher than 75% of them ($325 against a typical $281), it is bigger than 25% of them (1,575 ft² against a typical 2,194 ft²), its lot is bigger than 6% of them (3,302 ft² against a typical 0.95 ac) and it is newer than 89% of them (2005 against a typical 1988). Measured against all of Carroll County, it is worth more than 58% 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 817 Promenade Ln, Mount Airy, MD?

The 2025 property tax bill for 817 Promenade Ln, Mount Airy, MD was $4,952. The county assessed it at $411,100.

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