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Single Family ResidenceResidential
$634,419$298 / 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 95How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Jul 14, 2026
Last sold for $525,000 on May 14, 2019

4300 ROUND KNOLL RD

BALDWIN, MD 21013
4 / 1
Baths
2,128 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.
1.29 ac
Lot SizeThe size of the land the home sits on, from county records.
1985
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$634K
$602K low$667K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$525,000 · May 14, 2019

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$6,640 (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.$542,900 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$200,600
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$342,300
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$501,033
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$542,900

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.1.29
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
GarageWhether the property has a garage, and details like whether it is attached to the home.Mixed
PoolWhether the property has a pool, and what kind, such as in-ground.Yes
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Deck · 432 ft²Shed · 216 ft²Porch · 128 ft²

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
Carroll Manor Elementary SchoolA
Elementary · Grades KG–5 · 1.3 mi
H
Dulaney High SchoolA-
High · Grades 9–12 · 6.0 mi
M
Cockeysville Middle SchoolB
Middle · Grades 6–8 · 6.3 mi

District: Baltimore County Public Schools

Neighborhood · ZIP 21013These 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.62
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.86
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.47

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.96%
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.4.5%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.0%
PopulationHow many people live in this area.4,797
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.307 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$166,280
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$190,242
Average tempThe average temperature here across a full year.54°F
Annual precipHow much rain and melted snow falls here in a typical year.47 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

4300 Round Knoll 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.

  • Worth more than 86% of homes in Baltimore County
  • Costs more per square foot than 83% of homes in Baltimore County
  • Bigger than 78% of homes in Baltimore County
  • Has a bigger lot than 91% of homes in Baltimore County
  • Newer than 69% of homes in Baltimore County

What homes are worth in Baldwin 21013

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

This home
$358K$1.5M

This home is worth more than 49% of homes in Baldwin 21013.

How it measures up in Baldwin 21013

The dot is this home. The mark in the middle is the typical home in Baldwin 21013.

Estimated value$634,419
CheaperTypical $642,263Pricier

Pricier than 49% of homes nearby

Price per ft²$298
CheaperTypical $273Pricier

Pricier than 74% of homes nearby

Living area2,128 ft²
SmallerTypical 2,364 ft²Bigger

Bigger than 36% of homes nearby

Lot size1.29 ac
SmallerTypical 1.28 acBigger

Bigger than 50% of homes nearby

Year built1985
OlderTypical 1979Newer

Newer than 68% of homes nearby

How 4300 Round Knoll Rd ranks against every home in each area.
MeasureThis homeBaldwin 21013Baltimore County
Estimated valuepricier than$634,41949% of homes86% of homes
Price per ft²pricier than$29874% of homes83% of homes
Living areabigger than2,128 ft²36% of homes78% of homes
Lot sizebigger than1.29 ac50% of homes91% of homes
Year builtnewer than198568% of homes69% of homes

About 4300 Round Knoll Rd

How much is 4300 Round Knoll Rd, Baldwin, MD worth?

The TopHap Estimate for 4300 Round Knoll Rd, Baldwin, MD is $634,419 as of Jul 14, 2026. The likely range is $602,333 to $666,505. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 4300 Round Knoll Rd, Baldwin, MD last sell?

4300 Round Knoll Rd, Baldwin, MD last sold on May 14, 2019 for $525,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 4300 Round Knoll Rd, Baldwin, MD?

4300 Round Knoll Rd, Baldwin, MD has 4 bathrooms, 2,128 square feet of living space and a 1.29-acre lot.

When was 4300 Round Knoll Rd, Baldwin, MD built?

4300 Round Knoll Rd, Baldwin, MD was built in 1985, making it 41 years old. It is a conventional home. The building has 2 stories.

What schools serve 4300 Round Knoll Rd, Baldwin, MD?

4300 Round Knoll Rd, Baldwin, MD is assigned to Carroll Manor Elementary School (elementary), rated A; Dulaney High School (high), rated A-; Cockeysville Middle School (middle), rated B. All sit in Baltimore County Public Schools. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 4300 Round Knoll Rd, Baldwin, MD compare to other homes in Baldwin 21013?

Among the 1,742 homes in Baldwin 21013, it is worth more than 49% of them ($634,419 against a typical $642,263), its price per square foot is higher than 74% of them ($298 against a typical $273), it is bigger than 36% of them (2,128 ft² against a typical 2,364 ft²), its lot is bigger than 50% of them (1.29 ac against a typical 1.28 ac) and it is newer than 68% of them (1985 against a typical 1979). Measured against all of Baltimore County, it is worth more than 86% 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 4300 Round Knoll Rd, Baldwin, MD?

The 2025 property tax bill for 4300 Round Knoll Rd, Baldwin, MD was $6,640. The county assessed it at $542,900.

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