Health insurance in Williamson County, Texas
10 insurers sell 110 marketplace plans here, and 10.8% 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.
10 insurers competing here
10 insurers sell in Williamson County — 110 plans in total, around 11 each. Few people compare 110 plans properly without help. The number has not changed since the previous plan year.
Coverage is better here than across the state
10.8% of Williamson County's 631,278 under-65 residents have no health coverage — 68,119 people. That is far below Texas as a whole, which sits at 19.1% — 8.3 points better than its own state, and puts Williamson County in the middle half of the 1,817 counties on this site (922nd).
Some of those 68,119 are in the Texas coverage gap: under $15,960 a year, too little for a subsidy and no expanded Medicaid to fall back on.
How much the marketplace is used
63,546 Williamson County residents selected a marketplace plan for 2026: 101 per thousand under-65 residents, 784th of 1,817. That is above the 78 per thousand typical of published counties. 12,214 of them — 19% — were new rather than renewing.
Williamson County against Texas
Williamson County is the 12th largest of the 43 Texas counties we publish. Its uninsured rate runs 8.3 points lower than Texas overall and with 10 insurers it is as well served as anywhere in Texas. Marketplace use is well under the Texas rate.
| Williamson County | Texas | Published median | |
|---|---|---|---|
| Uninsured, under 65 | 10.8% | 19.1% | 9.9% |
| Insurers selling | 10 | 1–10 | 4 |
| Plans offered | 110 | — | 57 |
| Selections per 1,000 | 101 | 159 | 78 |
| New rather than renewing | 19% | 18% | 15% |
Counties of a similar size nearby
| County | Under 65 | Uninsured | Insurers | Plans |
|---|---|---|---|---|
| Montgomery County | 640,879 | 17.4% | 8 | 112 |
| El Paso County | 735,209 | 23.7% | 7 | 110 |
| Hidalgo County | 785,748 | 26.7% | 5 | 78 |
| Fort Bend County | 816,264 | 13.0% | 7 | 107 |
All of them have fewer insurers than this county's 10, which makes it the stronger market locally.
Other Texas counties · Where the subsidy stops · Enrollment dates