Health insurance in Charleston County, South Carolina
4 insurers sell 60 marketplace plans here, and 9.5% of under-65 residents have no coverage at all.
Source: CMS Marketplace Open Enrollment Public Use Files and US Census Small Area Health Insurance Estimates, 2026 release.
Who sells here, and how much choice that gives
4 insurers sell marketplace plans in Charleston County, offering 60 plans between them, roughly 15 each. It gained 1 since the previous plan year, up from 3.
How many people here have no coverage
9.5% of Charleston County's 344,054 under-65 residents have no health coverage — 32,735 people. That is below the South Carolina rate of 11.2%, and puts Charleston County in the middle half of the 1,817 counties on this site (1156th).
Some of those 32,735 are in the South Carolina coverage gap: under $15,960 a year, too little for a subsidy and no expanded Medicaid to fall back on.
The marketplace is used heavily here
51,103 Charleston County residents selected a marketplace plan for 2026: 149 per thousand under-65 residents, 345th of 1,817. That is 1.9× the 78 per thousand typical here. 7,129 of them — 14% — were new rather than renewing.
Charleston County against South Carolina
Charleston County is the 2nd largest of the 12 South Carolina counties we publish. Its uninsured rate runs 1.7 points lower than South Carolina overall and its 4 insurers sit between the state's 2 and 5. Marketplace use is close to the South Carolina rate.
| Charleston County | South Carolina | Published median | |
|---|---|---|---|
| Uninsured, under 65 | 9.5% | 11.2% | 9.9% |
| Insurers selling | 4 | 2–5 | 4 |
| Plans offered | 60 | — | 57 |
| Selections per 1,000 | 149 | 138 | 78 |
| New rather than renewing | 14% | 14% | 15% |
Counties of a similar size nearby
| County | Under 65 | Uninsured | Insurers | Plans |
|---|---|---|---|---|
| Spartanburg County | 300,077 | 12.4% | 4 | 44 |
| Horry County | 291,194 | 14.1% | 3 | 48 |
| Lexington County | 256,624 | 10.8% | 3 | 52 |
| Greenville County | 463,426 | 11.5% | 3 | 48 |
All of them have fewer insurers than this county's 4, which makes it the stronger market locally.
Other South Carolina counties · Where the subsidy stops · Enrollment dates