These South Carolina ZIP Codes Earn Nearly Three Times the State Average

South Carolina’s median household income is $64,115. In one ZIP code — a barrier island community of 2,100 residents where the ACS can’t record an exact home value because the median exceeds $2 million — the median household income is $179,614. That gap, and what drives it across four distinct economic clusters, is what this analysis is about.

We ranked every active South Carolina ZIP code with a population above 500 by median household income using the 2023 American Community Survey estimates. The top 10 are not randomly distributed. They concentrate in four geographic clusters with distinct underlying mechanisms: barrier island scarcity pushing home values to ACS reporting limits, a Charlotte commuter corridor whose fastest ZIP has the highest remote-work rate in the analysis, a Lake Keowee resort community that nearly doubled its income in four years, and a Daniel Island community planned from scratch on former timber land.

Where the top 10 sit in the full distribution

South Carolina has 362 ZIP codes with a population above 500 and a reportable median household income. The distribution is sharply right-skewed: most ZIPs cluster between $40,000 and $70,000, and the count drops steeply above $80,000. Every ZIP in the top 10 sits above the 97th percentile — a threshold most of the state never approaches.

When Sullivan’s Island records $179,614, that number is not competing with other $160,000 ZIPs — it is separated from the bulk of the state by more than $100,000 in median income. The top 10 collectively represent fewer than 3% of qualifying ZIPs, concentrated in an extreme tail most of South Carolina never occupies.

The top 10

Four geographic clusters

Every entry in the top 10 falls into one of four county-level areas. The clusters aren’t arbitrary — each has a distinct underlying mechanism that explains why wealth concentrates there rather than elsewhere in the state.

Sullivan’s Island (29482)

Sullivan’s Island ranks first by a margin of $25,793 above second-ranked Daufuskie Island. A barrier island town connected to Mount Pleasant by the Ben Sawyer Bridge, its permanent population of 2,127 occupies roughly 900 housing units on a peninsula where undeveloped land no longer exists. The ACS median home value reports as $2,000,001 — the Census Bureau’s top-code threshold — meaning the actual median is higher still. Transaction data suggests values above $2.5 million.

The college graduation rate of 88.3% is the highest of any ZIP in this analysis and nearly triple South Carolina’s statewide rate of approximately 31%. Unemployment is 1.7%. Income grew from $136,528 in 2019 to $179,614 in 2023 — a $43,086 absolute gain, the largest in dollar terms of any ZIP in the top 10.

What the data actually records here: Sullivan’s Island is not a high-income community because residents earn unusually high wages from local employment. The island has no major employers. The income figure reflects a permanent population of professionals, executives, and retirees who derive income from positions in Charleston’s financial, legal, and medical sectors, from business ownership, and from investment portfolios. The 8.3% poverty rate — anomalous for this income level — records the small number of service workers and permanent residents who predate the current era of appreciation.

Income vs. home value

The highest-income ZIP is not the highest home-value ZIP. That divergence is consistent across the top 10 and reflects different theories of how wealth gets stored: barrier islands where land scarcity compounds home values to multiples of income, and inland communities where homes remain affordable relative to what residents earn.

Isle of Palms (29451) leads on measurable home values at $1,197,800 — an 8.1× ratio to income. What the barrier-island premium records in the data: a fixed supply of land in a desirable location, compounded over decades of appreciation. The income figure represents what residents earn; the home value figure represents what the market now demands to join the community.

The Fort Mill ZIPs sit at the opposite extreme — 3.7× ratios for both 29708 and 29707. Charlotte-adjacent land is not scarce, and the community’s wealth derives from earnings rather than accumulated real estate equity. The gap between Fort Mill and Isle of Palms at similar income levels isn’t a valuation anomaly — it’s two entirely different theories of how wealth gets stored.

Daniel Island (29492) at 6.3× sits between the extremes. The planned community effect is visible here: land that was cheap in 1997 appreciated rapidly as Charleston’s urban premium extended outward, and the 6.3× ratio records three decades of that compounding.

Education and income

Education levels are high across all 10 ZIPs — but the relationship between credential rate and income rank is not linear. Sunset (29685) achieves $124,432 median income with a 50.5% graduation rate — nearly 40 points below the top two ZIPs at comparable income levels. That gap is the tell.

This ZIP boundary contains multiple realities: the Lake Keowee resort corridor, where arriving households skew professional and college-educated, coexists with an older rural Pickens County population that predates the discovery cycle and carries lower credential rates. The blended figure of 50.5% reflects both populations in proportion to their numbers.

The Fort Mill ZIPs — 68.4% and 63.9% — are below the barrier-island cluster but above Sunset. The underlying mechanism is the Charlotte knowledge-worker base: these are professional households whose income comes primarily from technology, finance, and healthcare employment at Charlotte-scale wages, rather than from the legal and financial elite that characterizes Sullivan’s Island or the retirement wealth of Daufuskie.

The Charleston metro picture

Five of the top 10 ZIPs are in the Charleston metro, representing different chapters in the same story of coastal appreciation and near-coastal professional growth.

Isle of Palms (29451) is the second barrier island in the group — a city of 4,382 permanent residents, homeownership at 90.7%, and a home value of $1,197,800. Income grew 22.4% from $121,196 in 2019. With 42.0% of households above $200,000, it is second only to Sullivan’s Island for high-income household density. The barrier-island premium operates identically: same scarcity dynamic, same filter on permanent residents, slightly larger population with more variability in the income distribution.

North Mount Pleasant (29466) is the largest ZIP in the top 10 at 44,387 residents. Income of $130,546 grew 15.4% from $113,117 in 2019. The WFH rate of 25.2% is among the highest in the analysis. Growth here reflects the gradual composition shift of a suburban ZIP as the Charleston peninsula’s housing costs push professionals outward: each household arriving at Mount Pleasant’s northern edge is statistically more likely than the household it displaced to have a graduate degree and a six-figure income.

Johns Island (29455) posted the fastest income growth of any large-population ZIP in the top 10: +48.4%, from $79,132 in 2019 to $117,422 in 2023. Growth here reflects composition shift more directly than anywhere else in this analysis. The largest sea island on the East Coast, it has been absorbing development overflow from the Charleston peninsula for a decade. The 9.24% poverty rate and 86.3% homeownership coexist in the same ZIP because longstanding agricultural households and new high-income arrivals in subdivisions on former farmland share a single ZIP boundary.

Daniel Island (29492) grew only 5.9% from 2019 — the slowest in the top 10. The planned community effect that drove rapid early appreciation has plateaued: the island’s build-out is substantially complete, the population stable in composition since roughly 2015, and income now moves primarily with the wage growth of its existing professional resident base.

Age and income growth

The relationship between median age and income growth is not linear. The two fastest-growing large-population ZIPs — Johns Island and Fort Mill South — are middle-aged communities, not young ones. The youngest ZIP in the analysis has the second-slowest growth.

Sunset’s outlier position (+88.5%) is driven entirely by the Lake Keowee discovery cycle — an external wealth inflow into a ZIP that already existed, not organic income growth among a stable population. Johns Island’s +48.4% reflects compositional replacement at speed. Fort Mill South’s +36.7% reflects the remote-work corridor effect: high-income Charlotte knowledge workers arriving without the daily commute constraint that previously made this location less attractive.

Daniel Island’s +5.9% — the youngest community in the analysis at median age 38.9 — is the clearest illustration that age and growth do not correlate here. The underlying mechanism explains the divergence: Daniel Island’s income grew slowly because its composition was already settled. Youth reflects recency of construction, not dynamism of income trajectory.

The York County / Fort Mill cluster

Two ZIPs — 29708 (York County) and 29707 (Lancaster County) — form the southern end of the Charlotte metropolitan area’s growth corridor. York County is the fastest-growing county in South Carolina, driven by its position as the lowest-tax, most space-per-dollar option for Charlotte-area professionals. The WFH data tells the story more clearly than the income figures alone.

Fort Mill South (29707) has a 33.3% WFH rate — the highest of any ZIP in this analysis and nearly 3× the state average. It grew from $86,052 in 2019 to $117,609. The underlying mechanism for Fort Mill South’s income growth is the decoupling of residential location from employment location: the remote-work transition removed the daily Charlotte commute constraint for a third of the ZIP’s workforce, enabling the ZIP to compete for higher-income remote households that would previously have chosen a location closer to downtown Charlotte.

Chapin (29036) sits in a contrasting quadrant: 15.8% WFH but 24.5% commuting 45+ minutes — the highest long-commute rate in the top 10. This is a legacy commuter community that has partially transitioned. The long-commute cohort — driving to Columbia’s state government campus or university corridor — is the pre-pandemic baseline. The WFH cohort is the recent addition.

Income growth, 2019 to 2023

The fastest growth belongs to communities that were either underpriced relative to their eventual desirability or underwent rapid demographic transformation. Sunset grew from a 2019 baseline of $66,020 — near the state median — to $124,432 entirely through the Lake Keowee discovery cycle. Johns Island grew from $79,132 to $117,422 as Charleston development pressure transformed farmland into high-income subdivisions.

At the other end, Daniel Island’s +5.9% and Daufuskie’s +11.6% are both communities where composition has been stable. What the data actually records in those cases is the income growth of an existing professional population over four years — modest, organic, and anchored to wage growth rather than demographic change.

Sunset (29685) and the ZIP boundary problem

The same ACS report showing a $124,432 median income — 98th percentile in South Carolina — also records an 11.1% poverty rate and a 10.9% unemployment rate. For context: the poverty rate at Isle of Palms is 1.76%; at Fort Mill West it is 4.86%.

This ZIP boundary contains multiple realities. The 29685 ZIP covers both the Lake Keowee luxury corridor — The Reserve, Keowee Key, and related high-end lake communities — and a broader rural Pickens County area that predates the lake’s development. Homeownership at 97.98% and a 38% vacancy rate (second homes not occupied at survey time) confirm the dual structure: 581 of 1,520 total housing units are vacant, indicating a large seasonal and second-home inventory that doesn’t register as occupied households in the income calculation.

The ACS blends both populations. The median income skews upward toward the arriving lakefront wealth; the poverty and unemployment rates reflect the underlying rural population that remains. Neither figure is wrong; neither figure alone is complete.

Where growth is heading

Three communities outside the current top 10 are approaching the threshold on current trajectories.

Fort Mill (29715) reached $111,323 in ACS 2023, up 33.9% from $83,130 in 2019, with 43,855 residents. Its trajectory mirrors 29708 and 29707 — same Charlotte commuter base, same WFH profile, same composition shift dynamic. At its current rate it enters the top 10 on the next ACS release cycle.

Awendaw (29429) reached $107,857 — a 55.1% gain from $69,521 in 2019. This small community at Charleston County’s northern edge, adjacent to the Francis Marion National Forest, shows the same land-exhaustion pattern as Johns Island: the outer fringe of the Charleston metro absorbing high-income arrivals as closer-in options become unaffordable.

Simpsonville (29681) reached $107,694 — a 25.2% gain from $86,051, with 67,657 residents. Greenville County’s largest suburb is the only Upstate South Carolina community approaching this threshold at scale, driven by the BMW, Michelin, and GE manufacturing management layer and the professional services firms that have built around it over decades.

Methodology

Rankings are based on median household income from the U.S. Census Bureau American Community Survey 5-Year Estimates, 2023 release (Table B19013). Data sourced from the ZipEngine database of ACS estimates. ZIP codes with active status and a population of at least 500 were included. Income growth comparisons use ACS 2019 5-year estimates as the baseline. The state income distribution uses all 362 qualifying SC ZIPs. ACS estimates carry margins of error that increase for small-population ZIPs — Daufuskie Island (29915, pop. 636) carries higher uncertainty than larger ZIPs. 29482 Sullivan’s Island home value is ACS top-coded at $2,000,001; actual median exceeds that threshold.