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Single Family ResidenceResidential
$527,743$308 / 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 96How 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 $431,000 on Jun 7, 2018

321 S HORNERS LN

ROCKVILLE, MD 20850
2
Baths
1,714 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.
0.14 ac
Lot SizeThe size of the land the home sits on, from county records.
1935
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.

Valuation

$528K
$509K low$547K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$431,000 · Jun 7, 2018

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$5,361 (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.$410,300 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$254,400
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$155,900
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$393,867
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$410,300

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
CountyMONTGOMERY
Lot (acres)The size of the land the home sits on, from county records.0.14
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.Radiant
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, 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.Deck · 120 ft²Porch · 80 ft²

Transaction History(1)

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
Maryvale Elementary SchoolB-
Elementary · Grades PK–5 · 0.5 mi
H
Rockville High SchoolB-
High · Grades 9–12 · 1.3 mi
M
Earle B. Wood Middle SchoolB-
Middle · Grades 6–8 · 1.9 mi

District: Montgomery County Public Schools

Neighborhood · ZIP 20850These 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.104
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 100.40

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.28%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.7.8%
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.51,693
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.3,703 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$126,425
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$154,183
Average tempThe average temperature here across a full year.54°F
Annual precipHow much rain and melted snow falls here in a typical year.43 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

321 S Horners 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 75% of homes in Rockville 20850
  • Costs less per square foot than 75% of homes in Rockville
  • Older than 98% of homes in Rockville

What homes are worth in Rockville 20850

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

This home
$183K$1.7M

This home is worth more than 25% of homes in Rockville 20850.

How it measures up in Rockville 20850

The dot is this home. The mark in the middle is the typical home in Rockville 20850.

Estimated value$527,743
CheaperTypical $752,041Pricier

Pricier than 25% of homes nearby

Price per ft²$308
CheaperTypical $340Pricier

Pricier than 29% of homes nearby

Living area1,714 ft²
SmallerTypical 2,048 ft²Bigger

Bigger than 37% of homes nearby

Lot size0.14 ac
SmallerTypical 4,138 ft²Bigger

Bigger than 56% of homes nearby

Year built1935
OlderTypical 1991Newer

Newer than 2% of homes nearby

How 321 S Horners Ln ranks against every home in each area.
MeasureThis homeRockvilleRockville 20850Montgomery County
Estimated valuepricier than$527,74328% of homes25% of homes36% of homes
Price per ft²pricier than$30825% of homes29% of homes52% of homes
Living areabigger than1,714 ft²42% of homes37% of homes38% of homes
Lot sizebigger than0.14 ac44% of homes56% of homes44% of homes
Year builtnewer than19352% of homes2% of homes3% of homes

About 321 S Horners Ln

How much is 321 S Horners Ln, Rockville, MD worth?

The TopHap Estimate for 321 S Horners Ln, Rockville, MD is $527,743 as of Sep 24, 2026. The likely range is $508,918 to $546,568. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 321 S Horners Ln, Rockville, MD last sell?

321 S Horners Ln, Rockville, MD last sold on Jun 7, 2018 for $431,000, according to the county's recorded deed.

How big is 321 S Horners Ln, Rockville, MD?

321 S Horners Ln, Rockville, MD has 2 bathrooms, 1,714 square feet of living space and a 0.14-acre lot.

When was 321 S Horners Ln, Rockville, MD built?

321 S Horners Ln, Rockville, MD was built in 1935, making it 91 years old. The building has 1 story.

What schools serve 321 S Horners Ln, Rockville, MD?

321 S Horners Ln, Rockville, MD is assigned to Maryvale Elementary School (elementary), rated B-; Rockville High School (high), rated B-; Earle B. Wood Middle School (middle), rated B-. All sit in Montgomery County Public Schools. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 321 S Horners Ln, Rockville, MD compare to other homes in Rockville 20850?

Among the 14,094 homes in Rockville 20850, it is worth more than 25% of them ($527,743 against a typical $752,041), its price per square foot is higher than 29% of them ($308 against a typical $340), it is bigger than 37% of them (1,714 ft² against a typical 2,048 ft²), its lot is bigger than 56% of them (0.14 ac against a typical 4,138 ft²) and it is newer than 2% of them (1935 against a typical 1991). Measured against all of Montgomery County, it is worth more than 36% 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 321 S Horners Ln, Rockville, MD?

The 2025 property tax bill for 321 S Horners Ln, Rockville, MD was $5,361. The county assessed it at $410,300.

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