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Single Family ResidenceResidential

9121 LONGS MILL RD

ROCKY RIDGE, MD 21778
2
Baths
2,370 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.
196.93 ac
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.

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$4,324 (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.$435,900 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$147,300
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$288,600
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$402,900
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$435,900

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
CountyFREDERICK
ConstructionThe main material the home's frame and walls are built from.Stone
RoofThe main material covering the roof, such as asphalt shingle or tile.Metal
HeatingThe type of heating system in the home.Radiant
PoolWhether the property has a pool, and what kind, such as in-ground.No

Neighborhood · ZIP 21778These 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.106
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.77
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.39

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.11%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.6.9%
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.1,439
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.80 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$81,802
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$112,057
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%

Ownership

OccupancyWhether the owner appears to live here or somewhere else. It is inferred from the mailing address on record.Absentee owner
Company ownedWhether the owner is a company or trust rather than a person.Yes

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

9121 Longs Mill 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.

  • Bigger than 73% of homes in Rocky Ridge 21778
  • Among the largest lots in Frederick County
  • Older than 97% of homes in Frederick County

How it measures up in Rocky Ridge 21778

The dot is this home. The mark in the middle is the typical home in Rocky Ridge 21778.

Living area2,370 ft²
SmallerTypical 1,732 ft²Bigger

Bigger than 73% of homes nearby

Lot size196.93 ac
SmallerTypical 3.01 acBigger

Bigger than almost all homes nearby

Year built1890
OlderTypical 1962Newer

Newer than 7% of homes nearby

How 9121 Longs Mill Rd ranks against every home in each area.
MeasureThis homeRocky Ridge 21778Frederick County
Living areabigger than2,370 ft²73% of homes56% of homes
Lot sizebigger than196.93 acalmost all homesalmost all homes
Year builtnewer than18907% of homes3% of homes

About 9121 Longs Mill Rd

When did 9121 Longs Mill Rd, Rocky Ridge, MD last sell?

9121 Longs Mill Rd, Rocky Ridge, MD last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 9121 Longs Mill Rd, Rocky Ridge, MD?

9121 Longs Mill Rd, Rocky Ridge, MD has 2 bathrooms and 2,370 square feet of living space.

When was 9121 Longs Mill Rd, Rocky Ridge, MD built?

9121 Longs Mill Rd, Rocky Ridge, MD was built in 1890, making it 136 years old. The building has 2 stories.

How does 9121 Longs Mill Rd, Rocky Ridge, MD compare to other homes in Rocky Ridge 21778?

Among the 437 homes in Rocky Ridge 21778, it is bigger than 73% of them (2,370 ft² against a typical 1,732 ft²), its lot is bigger than almost all of them (196.93 ac against a typical 3.01 ac) and it is newer than 7% of them (1890 against a typical 1962). These shares are recounted nightly from the full county assessor record for each area, not from active listings.

What are the property taxes on 9121 Longs Mill Rd, Rocky Ridge, MD?

The 2025 property tax bill for 9121 Longs Mill Rd, Rocky Ridge, MD was $4,324. The county assessed it at $435,900.

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