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Single Family ResidenceResidential
$5,286,330$797 / 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 93How 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

3121 ION AVE

SULLIVANS ISLAND, SC 29482
4
Beds
3.5
Baths
6,631 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.
0.41 ac
Lot SizeThe size of the land the home sits on, from county records.
1966
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

$5.3M
$4.9M low$5.7M high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$7,991 (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.$63,900 (2024)
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$63,900
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$1,932,000

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.92 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.0.41
HeatingThe type of heating system in the home.Heat Pump
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, 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.Porch · 2,242 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
Sullivan's Island Elementary SchoolA+
Elementary · Grades PK–5 · 1.7 mi
M
Moultrie Middle SchoolA+
Middle · Grades 6–8 · 3.5 mi
H
Wando High SchoolA+
High · Grades 9–12 · 8.5 mi

District: Charleston County School District

Neighborhood · ZIP 29482These 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.142
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.80
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.305

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.74%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.40%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.8.4%
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.976
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.254 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$176,028
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$301,831
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%

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

3121 Ion Ave 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.

  • Among the most valuable homes in Charleston County
  • Costs less per square foot than 98% of homes in Sullivans Island 29482
  • Among the largest homes in Charleston County
  • Has a bigger lot than 77% of homes in Charleston County
  • Older than 77% of homes in Charleston County

What homes are worth in Sullivans Island 29482

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

This home
$822K$10M

This home is worth more than 65% of homes in Sullivans Island 29482.

How it measures up in Sullivans Island 29482

The dot is this home. The mark in the middle is the typical home in Sullivans Island 29482.

Estimated value$5,286,330
CheaperTypical $4,260,068Pricier

Pricier than 65% of homes nearby

Price per ft²$797
CheaperTypical $1525Pricier

Pricier than 2% of homes nearby

Living area6,631 ft²
SmallerTypical 2,814 ft²Bigger

Bigger than almost all homes nearby

Lot size0.41 ac
SmallerTypical 0.47 acBigger

Bigger than 44% of homes nearby

Year built1966
OlderTypical 1974Newer

Newer than 43% of homes nearby

How 3121 Ion Ave ranks against every home in each area.
MeasureThis homeSullivans Island 29482Charleston County
Estimated valuepricier than$5,286,33065% of homesalmost all homes
Price per ft²pricier than$7972% of homes89% of homes
Living areabigger than6,631 ft²almost all homesalmost all homes
Lot sizebigger than0.41 ac44% of homes77% of homes
Year builtnewer than196643% of homes23% of homes

About 3121 Ion Ave

How much is 3121 Ion Ave, Sullivans Island, SC worth?

The TopHap Estimate for 3121 Ion Ave, Sullivans Island, SC is $5,286,330 as of Sep 24, 2026. The likely range is $4,894,267 to $5,678,393. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 3121 Ion Ave, Sullivans Island, SC last sell?

3121 Ion Ave, Sullivans Island, SC last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 3121 Ion Ave, Sullivans Island, SC?

3121 Ion Ave, Sullivans Island, SC has 4 bedrooms, 3.5 bathrooms, 6,631 square feet of living space and a 0.41-acre lot.

When was 3121 Ion Ave, Sullivans Island, SC built?

3121 Ion Ave, Sullivans Island, SC was built in 1966, making it 60 years old. The building has 2 stories.

What schools serve 3121 Ion Ave, Sullivans Island, SC?

3121 Ion Ave, Sullivans Island, SC is assigned to Sullivan's Island Elementary School (elementary), rated A+; Moultrie Middle School (middle), rated A+; Wando 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 3121 Ion Ave, Sullivans Island, SC compare to other homes in Sullivans Island 29482?

Among the 1,004 homes in Sullivans Island 29482, it is worth more than 65% of them ($5,286,330 against a typical $4,260,068), its price per square foot is higher than 2% of them ($797 against a typical $1525), it is bigger than almost all of them (6,631 ft² against a typical 2,814 ft²), its lot is bigger than 44% of them (0.41 ac against a typical 0.47 ac) and it is newer than 43% of them (1966 against a typical 1974). Measured against all of Charleston County, it is worth more than almost all 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 3121 Ion Ave, Sullivans Island, SC?

The 2025 property tax bill for 3121 Ion Ave, Sullivans Island, SC was $7,991. The county assessed it at $63,900.

More homes on Ion Ave

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More homes in Sullivans Island 29482

Assigned schools

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