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Single Family ResidenceResidential
$2,336,281
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 88How 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
Last sold for $450,000 on Oct 5, 2010

16 21ST AVE

ISLE OF PALMS, SC 29451
0
Baths
0.38 ac
Lot SizeThe size of the land the home sits on, from county records.

Valuation

$2.3M
$2.1M low$2.6M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$450,000 · Oct 5, 2010

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$72 (2025)

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.55 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.98%

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.0.38
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 · 294 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 School
Elementary · Grades PK–5 · 3.9 mi
M
Moultrie Middle SchoolA+
Middle · Grades 6–8 · 5.1 mi
H
Wando High SchoolA
High · Grades 9–12 · 6.7 mi

District: Charleston County School District

Neighborhood · ZIP 29451These 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.130
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 100.291

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.55%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.31%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.3.5%
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.5,565
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.443 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$158,034
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$228,227
Average tempThe average temperature here across a full year.65°F
Annual precipHow much rain and melted snow falls here in a typical year.50 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

16 21st 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.

  • Worth more than 94% of homes in Charleston County
  • Has a bigger lot than 74% of homes in Isle of Palms 29451

What homes are worth in Isle of Palms 29451

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

This home
$491K$6.3M

This home is worth more than 69% of homes in Isle of Palms 29451.

How it measures up in Isle of Palms 29451

The dot is this home. The mark in the middle is the typical home in Isle of Palms 29451.

Estimated value$2,336,281
CheaperTypical $1,781,226Pricier

Pricier than 69% of homes nearby

Lot size0.38 ac
SmallerTypical 0.25 acBigger

Bigger than 74% of homes nearby

How 16 21st Ave ranks against every home in each area.
MeasureThis homeIsle of Palms 29451Charleston County
Estimated valuepricier than$2,336,28169% of homes94% of homes
Lot sizebigger than0.38 ac74% of homes74% of homes

About 16 21st Ave

How much is 16 21st Ave, Isle Of Palms, SC worth?

The TopHap Estimate for 16 21st Ave, Isle Of Palms, SC is $2,336,281 as of Sep 24, 2026. The likely range is $2,059,464 to $2,613,098. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 16 21st Ave, Isle Of Palms, SC last sell?

16 21st Ave, Isle Of Palms, SC last sold on Oct 5, 2010 for $450,000, according to the county's recorded deed.

What schools serve 16 21st Ave, Isle Of Palms, SC?

16 21st Ave, Isle Of Palms, SC is assigned to Sullivan's Island Elementary School (elementary); 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 16 21st Ave, Isle Of Palms, SC compare to other homes in Isle of Palms 29451?

Among the 4,578 homes in Isle of Palms 29451, it is worth more than 69% of them ($2,336,281 against a typical $1,781,226) and its lot is bigger than 74% of them (0.38 ac against a typical 0.25 ac). Measured against all of Charleston County, it is worth more than 94% 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 16 21st Ave, Isle Of Palms, SC?

The 2025 property tax bill for 16 21st Ave, Isle Of Palms, SC was $72.

More homes on 21st Ave

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More homes in Isle Of Palms 29451

Assigned schools

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See this home in context

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