Skip to content
Skip to content
TopHapOpen in map
Single Family ResidenceResidential
$378,751$218 / 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

3603 BLACKWELL RUN

MARIETTA, GA 30066
3
Beds
3
Baths
1,738 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.
0.37 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.
6
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$379K
$359K low$399K high
Est. Owner EquityRoughly how much of the home's value the owner would keep after paying off known loans. It is our estimate minus the loans still owed.$179,751
Est. Lendable EquityThe part of the owner's equity a lender would typically let them borrow against — about 80% of their equity.$143,801
Loan-to-ValueHow much is still owed on the home compared to what it is worth. 80% means loans equal 80% of our estimate, so it shifts when the estimate does.53%
1st MortgageA loan still believed to be open on this home, in the order lenders get repaid. The first position is paid back before the second.$199,000
MORTGAGE ASSURANCE INC · recorded Jan 25, 2021

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$830 (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.$163,520 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$40,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$123,520
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$303,020
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$408,800

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.48
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
13
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
85
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
96
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
45
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.
FEMA Flood ZoneFEMA's flood zone for this address. Zones starting with A or V are high risk, and lenders usually require flood insurance there.minimal

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
StyleThe architectural style of the home, such as ranch or colonial.Split Level
CountyCobb
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
HeatingThe type of heating system in the home.Heat Pump
CoolingThe type of cooling or air conditioning in the home.Central
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.Garage, Basement
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 · 25 ft²Patio · 347 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.

M
Daniell Middle SchoolB+
Middle · Grades 6–8 · 1.4 mi
E
Addison Elementary SchoolB+
Elementary · Grades KG–5 · 1.8 mi
H
Sprayberry High SchoolB-
High · Grades 9–12 · 2.2 mi

District: Cobb County School District

Neighborhood · ZIP 30066These 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.84
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.59

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.33%
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.1.1%
PopulationHow many people live in this area.61,880
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.2,228 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$112,880
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$137,507
Average tempThe average temperature here across a full year.60°F
Annual precipHow much rain and melted snow falls here in a typical year.54 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.61%

Ownership

OccupancyWhether the owner appears to live here or somewhere else. It is inferred from the mailing address on record.Owner occupied
Company ownedWhether the owner is a company or trust rather than a person.No

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

3603 Blackwell Run 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 70% of homes in Marietta 30066
  • Smaller than 65% of homes in Marietta 30066
  • Has a bigger lot than 68% of homes in Cobb County

What homes are worth in Marietta 30066

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

This home
$254K$1.1M

This home is worth more than 30% of homes in Marietta 30066.

How it measures up in Marietta 30066

The dot is this home. The mark in the middle is the typical home in Marietta 30066.

Estimated value$378,751
CheaperTypical $441,262Pricier

Pricier than 30% of homes nearby

Price per ft²$218
CheaperTypical $223Pricier

Pricier than 46% of homes nearby

Living area1,738 ft²
SmallerTypical 2,019 ft²Bigger

Bigger than 35% of homes nearby

Lot size0.37 ac
SmallerTypical 0.34 acBigger

Bigger than 64% of homes nearby

Year built1985
OlderTypical 1986Newer

Newer than 46% of homes nearby

How 3603 Blackwell Run ranks against every home in each area.
MeasureThis homeMarietta 30066Cobb County
Estimated valuepricier than$378,75130% of homes40% of homes
Price per ft²pricier than$21846% of homes55% of homes
Living areabigger than1,738 ft²35% of homes38% of homes
Lot sizebigger than0.37 ac64% of homes68% of homes
Year builtnewer than198546% of homes40% of homes

About 3603 Blackwell Run

How much is 3603 Blackwell Run, Marietta, GA worth?

The TopHap Estimate for 3603 Blackwell Run, Marietta, GA is $378,751 as of Jul 14, 2026. The likely range is $358,552 to $398,950. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 3603 Blackwell Run, Marietta, GA last sell?

3603 Blackwell Run, Marietta, GA last sold on Apr 18, 2019, according to the county's recorded deed.

How big is 3603 Blackwell Run, Marietta, GA?

3603 Blackwell Run, Marietta, GA has 3 bedrooms, 3 bathrooms and 1,738 square feet of living space.

When was 3603 Blackwell Run, Marietta, GA built?

3603 Blackwell Run, Marietta, GA was built in 1985, making it 41 years old. It is a split level home. The building has 2 stories.

What schools serve 3603 Blackwell Run, Marietta, GA?

3603 Blackwell Run, Marietta, GA is assigned to Daniell Middle School (middle), rated B+; Addison Elementary School (elementary), rated B+; Sprayberry High School (high), rated B-. All sit in Cobb County School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 3603 Blackwell Run, Marietta, GA compare to other homes in Marietta 30066?

Among the 20,262 homes in Marietta 30066, it is worth more than 30% of them ($378,751 against a typical $441,262), its price per square foot is higher than 46% of them ($218 against a typical $223), it is bigger than 35% of them (1,738 ft² against a typical 2,019 ft²), its lot is bigger than 64% of them (0.37 ac against a typical 0.34 ac) and it is newer than 46% of them (1985 against a typical 1986). Measured against all of Cobb County, it is worth more than 40% 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 3603 Blackwell Run, Marietta, GA?

The 2025 property tax bill for 3603 Blackwell Run, Marietta, GA was $830. The county assessed it at $163,520.

Closest homes

More homes in Marietta 30066

Assigned schools

Explore the area

See this home in context

Open 3603 Blackwell Run on TopHap’s interactive map to compare it against every sale nearby, overlay school zones and flood risk, and run a CMA.

Open in map
A flyover of TopHap's photorealistic 3D map, with recorded sale prices pinned to homes
Search any address, city, zip, or county…3D$1.9M$6.25MOpen in map