Health insurance in St. Clair County, Michigan
5 insurers sell 51 marketplace plans here, and 5.8% 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
5 insurers compete in St. Clair County with 51 plans between them, about 10 plans each. The number has not changed since the previous plan year.
Comparatively few people go uncovered
5.8% of St. Clair County's 126,050 under-65 residents have no health coverage — 7,337 people. That is close to the Michigan rate of 6.2%, and puts St. Clair County in the bottom 10% of the 1,817 counties on this site (1731st).
How much the marketplace is used
6,508 St. Clair County residents selected a marketplace plan for 2026: 52 per thousand under-65 residents, 1550th of 1,817. That is under the 78 per thousand typical of published counties. 718 of them — 11% — were new rather than renewing.
St. Clair County against Michigan
St. Clair County is the 13th largest of the 19 Michigan counties we publish. Its uninsured rate tracks the state almost exactly and its 5 insurers sit between the state's 2 and 7. Marketplace use is close to the Michigan rate.
| St. Clair County | Michigan | Published median | |
|---|---|---|---|
| Uninsured, under 65 | 5.8% | 6.2% | 9.9% |
| Insurers selling | 5 | 2–7 | 4 |
| Plans offered | 51 | — | 57 |
| Selections per 1,000 | 52 | 62 | 78 |
| New rather than renewing | 11% | 13% | 15% |
Counties of a similar size nearby
| County | Under 65 | Uninsured | Insurers | Plans |
|---|---|---|---|---|
| Monroe County | 123,647 | 5.0% | 4 | 46 |
| Jackson County | 120,964 | 6.0% | 5 | 59 |
| Berrien County | 116,649 | 7.6% | 4 | 42 |
| Muskegon County | 140,022 | 5.8% | 5 | 50 |
All of them have fewer insurers than this county's 5, which makes it the stronger market locally.
All Michigan counties · How the credit works · Enrollment dates