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Single Family ResidenceResidential
$822,500$179 / 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 98How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Oct 21, 2026
Last sold for $815,000 on Oct 21, 2026

509 KARN PL

BRUNSWICK, MD 21716
4.5
Baths
4,596 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.
0.19 ac
Lot SizeThe size of the land the home sits on, from county records.
2022
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
3
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$823K
$803K low$842K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$815,000 · Oct 21, 2026

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$11,924 (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.$698,133 (2026)
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$642,367
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$753,900

Climate Risk

Overall riskThe average of the five hazard scores below, on a 0 to 100 scale. Higher means greater projected risk over the coming decades.42
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
15
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
79
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
83
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
34
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.

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
CountyFREDERICK
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.Heat Pump
CoolingThe type of cooling or air conditioning in the home.Central
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.Deck · 340 ft²Patio · 340 ft²Porch · 90 ft²

Transaction History(3)

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
Brunswick Elementary SchoolB+
Elementary · Grades KG–5 · 0.3 mi
H
Brunswick High SchoolB+
High · Grades 9–12 · 1.3 mi
M
Brunswick Middle SchoolB
Middle · Grades 6–8 · 1.6 mi

District: Frederick County Public Schools

Neighborhood · ZIP 21716These 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.129
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.73
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.38

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.92%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.19%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.6.5%
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.6,695
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.2,110 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$97,673
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$116,880
Average tempThe average temperature here across a full year.54°F
Annual precipHow much rain and melted snow falls here in a typical year.42 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.57%

Owner Tools

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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

509 Karn Pl 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 95% of homes in Brunswick 21716
  • Costs less per square foot than 89% of homes in Frederick County
  • Bigger than 97% of homes in Brunswick 21716
  • Has a bigger lot than 75% of homes in Brunswick 21716
  • Newer than 96% of homes in Frederick County

What homes are worth in Brunswick 21716

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

This home
$239K$880K

This home is worth more than 95% of homes in Brunswick 21716.

How it measures up in Brunswick 21716

The dot is this home. The mark in the middle is the typical home in Brunswick 21716.

Estimated value$822,500
CheaperTypical $399,902Pricier

Pricier than 95% of homes nearby

Price per ft²$179
CheaperTypical $211Pricier

Pricier than 16% of homes nearby

Living area4,596 ft²
SmallerTypical 1,970 ft²Bigger

Bigger than 97% of homes nearby

Lot size0.19 ac
SmallerTypical 0.15 acBigger

Bigger than 75% of homes nearby

Year built2022
OlderTypical 1983Newer

Newer than 91% of homes nearby

How 509 Karn Pl ranks against every home in each area.
MeasureThis homeBrunswick 21716Frederick County
Estimated valuepricier than$822,50095% of homes92% of homes
Price per ft²pricier than$17916% of homes11% of homes
Living areabigger than4,596 ft²97% of homes95% of homes
Lot sizebigger than0.19 ac75% of homes46% of homes
Year builtnewer than202291% of homes96% of homes

About 509 Karn Pl

How much is 509 Karn Pl, Brunswick, MD worth?

The TopHap Estimate for 509 Karn Pl, Brunswick, MD is $822,500 as of Oct 21, 2026. The likely range is $803,331 to $841,669. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 509 Karn Pl, Brunswick, MD last sell?

509 Karn Pl, Brunswick, MD last sold on Oct 21, 2026 for $815,000, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

How big is 509 Karn Pl, Brunswick, MD?

509 Karn Pl, Brunswick, MD has 4.5 bathrooms, 4,596 square feet of living space and a 0.20-acre lot.

When was 509 Karn Pl, Brunswick, MD built?

509 Karn Pl, Brunswick, MD was built in 2022, making it 4 years old. The building has 2 stories.

What schools serve 509 Karn Pl, Brunswick, MD?

509 Karn Pl, Brunswick, MD is assigned to Brunswick Elementary School (elementary), rated B+; Brunswick High School (high), rated B+; Brunswick Middle School (middle), rated B. All sit in Frederick County Public Schools. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 509 Karn Pl, Brunswick, MD compare to other homes in Brunswick 21716?

Among the 3,205 homes in Brunswick 21716, it is worth more than 95% of them ($822,500 against a typical $399,902), its price per square foot is higher than 16% of them ($179 against a typical $211), it is bigger than 97% of them (4,596 ft² against a typical 1,970 ft²), its lot is bigger than 75% of them (0.19 ac against a typical 0.15 ac) and it is newer than 91% of them (2022 against a typical 1983). Measured against all of Frederick County, it is worth more than 92% 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 509 Karn Pl, Brunswick, MD?

The 2025 property tax bill for 509 Karn Pl, Brunswick, MD was $11,924. The county assessed it at $698,133.

More homes on Karn Pl

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Assigned schools

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