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Single Family ResidenceResidential
$1,291,486$1,087 / 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 53How 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

646 WILLIAMSON DR

MOUNT PLEASANT, SC 29464
3
Beds
2
Baths
1,188 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.
0.22 ac
Lot SizeThe size of the land the home sits on, from county records.
1983
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.

Valuation

$1.3M
$691K low$1.9M high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$1,307 (2024)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$12,290 (2024)
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$12,290
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$401,898

Climate Risk

Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.104 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.89%

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
CountyCharleston
Lot (acres)The size of the land the home sits on, from county records.0.22
FoundationWhat the home is built on, such as a concrete slab, a crawl space, or a basement.Mat/Raft Foundation (Slab)
HeatingThe type of heating system in the home.Heat Pump
CoolingThe type of cooling or air conditioning in the home.Yes
FireplaceWhether the home has a fireplace, and what kind.Yes
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.Shed · 196 ft²Porch · 576 ft²

Assigned SchoolsThe public schools this address is zoned for. Boundaries change, so confirm with the district before you count on it.

M
Moultrie Middle SchoolA+
Middle · Grades 6–8 · 1.0 mi
E
James B. Edwards Elementary School
Elementary · Grades PK–5 · 1.7 mi
H
Lucy Garrett Beckham High SchoolA
High · Grades 9–12 · 2.4 mi

District: Charleston County School District

Neighborhood · ZIP 29464These 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.69
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 100.344

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.91%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.42%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.6.0%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.2%
PopulationHow many people live in this area.54,918
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,518 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$111,069
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$147,355
Average tempThe average temperature here across a full year.66°F
Annual precipHow much rain and melted snow falls here in a typical year.49 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.63%

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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

646 Williamson Dr 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 83% of homes in Charleston County
  • Costs more per square foot than 96% of homes in Mount Pleasant 29464
  • Smaller than 86% of homes in Mount Pleasant 29464
  • Older than 65% of homes in Mount Pleasant 29464

What homes are worth in Mount Pleasant 29464

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

This home
$345K$3.9M

This home is worth more than 69% of homes in Mount Pleasant 29464.

How it measures up in Mount Pleasant 29464

The dot is this home. The mark in the middle is the typical home in Mount Pleasant 29464.

Estimated value$1,291,486
CheaperTypical $975,925Pricier

Pricier than 69% of homes nearby

Price per ft²$1087
CheaperTypical $473Pricier

Pricier than 96% of homes nearby

Living area1,188 ft²
SmallerTypical 1,922 ft²Bigger

Bigger than 14% of homes nearby

Lot size0.22 ac
SmallerTypical 0.26 acBigger

Bigger than 38% of homes nearby

Year built1983
OlderTypical 1988Newer

Newer than 35% of homes nearby

How 646 Williamson Dr ranks against every home in each area.
MeasureThis homeMount Pleasant 29464Charleston County
Estimated valuepricier than$1,291,48669% of homes83% of homes
Price per ft²pricier than$108796% of homes96% of homes
Living areabigger than1,188 ft²14% of homes22% of homes
Lot sizebigger than0.22 ac38% of homes43% of homes
Year builtnewer than198335% of homes41% of homes

About 646 Williamson Dr

How much is 646 Williamson Dr, Mount Pleasant, SC worth?

The TopHap Estimate for 646 Williamson Dr, Mount Pleasant, SC is $1,291,486 as of Sep 24, 2026. The likely range is $690,782 to $1,892,190. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 646 Williamson Dr, Mount Pleasant, SC last sell?

646 Williamson Dr, Mount Pleasant, SC last sold on Apr 28, 1992, according to the county's recorded deed.

How big is 646 Williamson Dr, Mount Pleasant, SC?

646 Williamson Dr, Mount Pleasant, SC has 3 bedrooms, 2 bathrooms, 1,188 square feet of living space and a 0.22-acre lot.

When was 646 Williamson Dr, Mount Pleasant, SC built?

646 Williamson Dr, Mount Pleasant, SC was built in 1983, making it 43 years old. The building has 2 stories.

What schools serve 646 Williamson Dr, Mount Pleasant, SC?

646 Williamson Dr, Mount Pleasant, SC is assigned to Moultrie Middle School (middle), rated A+; James B. Edwards Elementary School (elementary); Lucy Garrett Beckham High School (high), rated A. All sit in Charleston County School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 646 Williamson Dr, Mount Pleasant, SC compare to other homes in Mount Pleasant 29464?

Among the 19,180 homes in Mount Pleasant 29464, it is worth more than 69% of them ($1,291,486 against a typical $975,925), its price per square foot is higher than 96% of them ($1087 against a typical $473), it is bigger than 14% of them (1,188 ft² against a typical 1,922 ft²), its lot is bigger than 38% of them (0.22 ac against a typical 0.26 ac) and it is newer than 35% of them (1983 against a typical 1988). Measured against all of Charleston County, it is worth more than 83% 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 646 Williamson Dr, Mount Pleasant, SC?

The 2024 property tax bill for 646 Williamson Dr, Mount Pleasant, SC was $1,307. The county assessed it at $12,290.

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