Medicare in Williamson County by the numbers
| Williamson County | Texas | |
|---|---|---|
| Residents age 65 and older | 91,251 | 4,188,063 statewide |
| Share of residents age 65+ | 13.1% | 13.7% statewide |
| People with Medicare | 105,589 | 5,048,909 statewide |
| Enrolled in Medicare Advantage | 50,010 | 2,770,279 statewide |
| Medicare Advantage share | 47.4% | 54.9% statewide |
Figures come from the Census Bureau and CMS (September 2026).
With roughly 91,251 residents age 65 and older, Williamson County is 12th among 254 Texas counties for older residents. That group is 13.1% of its population, compared with 13.7% across Texas. The 33,673 residents now between 60 and 64 will become Medicare-eligible soon, and our turning 65 guide walks through it. Census 2023 estimates show 59% of the 65-plus population is under 75, 32% is 75 to 84 and 9% is 85 or older. CMS data show 47.4% of Williamson County residents with Medicare chose Medicare Advantage, which is lower than the 54.9% average across Texas. A county average does not tell you which kind of plan fits you. Whether Medicare Advantage or Original Medicare with a Medigap plan is the better fit depends on your doctors, your prescriptions and how you want to handle costs, so we compare both for your ZIP code.
Who has Medicare in Williamson County
Williamson County sits in a metro area, which the USDA defines as counties in metro areas of 1 million population or more. That usually means more doctors, more hospitals and more plan choices in the area.
CMS counts 98,286 Medicare beneficiaries in Williamson County (2023). Their average age is 73, about the same as the Texas average of 73. About 6% are “dual eligible,” meaning they have both Medicare and Medicaid, lower than the state figure of 11%.
Among people in Original Medicare in Williamson County, CMS reported about 527 emergency room visits and 188 inpatient hospital stays per 1,000 beneficiaries in 2023, which is close to the state average for emergency visits (580) and lower than it for hospital stays (226). About 10% received home health care. These figures describe how people use care under Original Medicare; they do not show what any plan covers or costs.
Sources: CMS Medicare Geographic Variation, 2023; USDA Rural-Urban Continuum Codes, 2023.
Medicare Advantage and Part D plan availability and provider networks are set county by county, so the plans open to you in Williamson County may differ from those in a neighboring county. We are not based in Williamson County; we help Williamson County residents by phone or video call.
Hospitals located in Williamson County
The Centers for Medicare & Medicaid Services (CMS) lists these hospitals in Williamson County:
- Ascension Seton Cedar Park — Cedar Park (acute care; nonprofit; emergency services; CMS overall rating 3 of 5)
- Ascension Seton Williamson — Round Rock (acute care; nonprofit; emergency services; CMS overall rating 4 of 5)
- Baylor Scott & White Medical Center - Round Rock — Round Rock (acute care; nonprofit; emergency services; CMS overall rating 4 of 5)
- Baylor Scott & White Medical Center -Taylor — Taylor (critical access; nonprofit; emergency services)
- Brushy Creek Family Hospital — Round Rock (acute care; for-profit; no emergency department)
- Round Rock Medical Center — Round Rock (acute care; for-profit; emergency services; CMS overall rating 3 of 5)
- Texas Childrens Hospital North Austin Campus — Austin (children's; nonprofit; emergency services)
Network rules, not geography, decide whether a plan covers a hospital. We look up the hospitals and doctors you use and check them against each plan before you enroll. Ratings are CMS Care Compare overall hospital star ratings; they describe the hospital, not whether a plan covers it. Source: CMS Hospital General Information.
Where people live in Williamson County
Census Bureau 2023 estimates put the biggest communities in Williamson County at Round Rock (128,510), Georgetown (96,312), Cedar Park (70,681), Leander (68,719), Austin (67,510), Hutto (38,765), counting only the part of each community inside the county.
Census ZIP Code Tabulation Areas mostly within Williamson County number 19: 76527, 76530, 76537, 76573, 76574, 76578, 78613, 78615, 78626, 78628, 78633, 78634, 78642, 78664 and 5 more. Your exact ZIP code is what decides which plans you can join.
Questions about Medicare in Williamson County?
Reach out to us: fill out our short form or call (571) 354-0146, and a licensed agent will compare the plans available to you, check your doctors and drugs, and stay with you each year at renewal. For general Medicare information, the federal helpline is 1-800-MEDICARE (1-800-633-4227).
Medicare resources from official sources
- Medicare Plan Finder on Medicare.gov, searchable by ZIP code.
- HealthCare.gov if you are not yet on Medicare.
- Medicare Care Compare for hospitals and doctors.
- Social Security: Medicare to enroll or check status.
- Texas Department of Insurance: Texas’s insurance regulator, including agent license lookup.
Coverage we offer Williamson County residents
Here is what we can help Williamson County residents with, drawing on plans from many insurers: annuities, Medicare Advantage, Medicare Supplement (Medigap), Part D drug plans, ACA health insurance, ICHRA, group health insurance, life insurance and final expense insurance.
Let’s check your Williamson County options together
We confirm your doctors and prescriptions before you enroll, at no cost to you.
Get my plan comparisonRead next
- Why a Medicare Advantage plan drops a doctor or drug
- Medicare Parts A, B, C and D explained
- How to read your Medicare Annual Notice of Change
- Does Medicare cover dental, vision and hearing?
Williamson County compared with similar Texas counties
| County | Residents 65+ | Medicare Advantage share | Dual eligible share | Area type |
|---|---|---|---|---|
| Montgomery County | 99,841 | 52.2% | 6% | Metro |
| Hidalgo County | 106,589 | 78.0% | 27% | Metro |
| El Paso County | 117,006 | 74.9% | 12% | Metro |
| Fort Bend County | 118,950 | 55.6% | 10% | Metro |
| Cameron County | 61,905 | 75.0% | 32% | Metro |
| Denton County | 120,688 | 45.0% | 7% | Metro |
See every Texas county in our Texas directory or go to our Texas Medicare hub.