Medicare Supplement in Nassau County, Florida. About 29,972 Medicare beneficiaries live here, with roughly 43 percent in Medicare Advantage plans. Top carriers include UnitedHealthcare and Aetna. For free help comparing plans, call Giron Agency, a licensed Florida agency, or visit gironagency.com.
Nassau County, FL has 29,972 Medicare beneficiaries per CMS Q1 2024 data, with about 43% enrolled in Medicare Advantage. The top medicare supplement carriers are UnitedHealthcare, Aetna, Humana. We compare these plans for free and never charge a fee.
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The Nassau County medicare supplement market
At roughly 43% MA penetration, most of Nassau County's 29,972 Medicare beneficiaries stay on Original Medicare, frequently paired with a Medigap policy. That pattern usually signals retirees here prize provider choice and predictable out-of-pocket costs over the lower premiums of MA. The county skews older than the Florida average (25% are 65 or older), which means heavy carrier competition and meaningful plan turnover each Annual Enrollment Period — a yearly review almost always pays off. UnitedHealthcare currently leads the county by enrollment, but the lowest total-cost plan for your specific drugs and doctors is often a smaller carrier — which is why we run all of them side by side instead of pushing the biggest name. Right now roughly 20 Medicare Advantage plans are available in Nassau County, so a side-by-side comparison genuinely matters. Medicare Advantage enrollment figures reflect the latest CMS data (May 2026).
Nassau County at a glance
Population (2024 ACS)
104,400
Medicare beneficiaries
29,972
MA penetration
43%
Age 65 or older
25%
What makes Nassau County different: Nassau County pairs the upscale Amelia Island resort economy (Ritz-Carlton and Omni Amelia Island Resort) and Rayonier's historic Fernandina Beach pulp mill with a high 24.9% age-65+ share, reflecting its draw as a coastal retirement and second-home market on the northeast tip of the Jacksonville metro. Baptist Medical Center Nassau is the county's only acute-care hospital, anchoring care for a fast-growing retiree population.
Top Medicare Advantage plans in Nassau County
UnitedHealthcare (AARP)
4.5-star CMS rating
Aetna
4.5-star CMS rating
Humana
4-star CMS rating
Florida Blue (Blue Cross Blue Shield of Florida)
4-star CMS rating
Source: CMS Monthly MA Enrollment by State/County/Contract (latest Q1 2024). Enrollment figures refresh monthly at data.cms.gov.
Before you enroll: verify your hospital + doctor in Nassau County
Each Medicare Supplement plan builds its own provider network — a hospital that's in-network
on one plan may be out-of-network on another. Nassau County has 3
major hospital systems. Before you enroll, check that your preferred hospital and physicians
participate in the specific plan you're considering.
Major hospitals to verify
▸Baptist Medical Center Nassau
▸UF Health North (Jacksonville)
▸Baptist Medical Center Jacksonville
Call each hospital's billing office directly — or use the carrier's
network tool on the right to search by hospital name.
Or skip the cross-checking — we run network checks against your prescriptions and doctors
at no cost during any consult.
Medicare AEP opens in 131 days
131 daysuntil open
Outside the windows, Special Enrollment Periods (SEP) still let you change plans if you moved, lost coverage, qualify for Extra Help / dual eligible, or had a plan terminated. Call to see if you qualify.
Major hospitals: Baptist Medical Center Nassau, UF Health North (Jacksonville), Baptist Medical Center Jacksonville
Frequently Asked Questions
How many Medicare beneficiaries live in Nassau County?▾
About 29,972 Floridians in Nassau County are enrolled in Medicare as of May 2026 CMS data. About 43% are in Medicare Advantage plans; the rest are in Original Medicare (with or without Medigap).
Who are the top Medicare carriers in Nassau County?▾
The largest carriers in Nassau County are UnitedHealthcare (AARP), Aetna, Humana, Florida Blue (Blue Cross Blue Shield of Florida). We work with all of them and a few smaller carriers that often have better rates for specific situations.
What SHIP resources are available in Nassau County?▾
Florida SHINE -- Nassau County (1-800-963-5337) provides free unbiased Medicare counseling. Major hospitals in the county include Baptist Medical Center Nassau, UF Health North (Jacksonville), Baptist Medical Center Jacksonville.
How many Medicare Advantage plans are available in Nassau County?▾
As of May 2026, about 20 Medicare Advantage plans are available to Nassau County residents, led by UnitedHealth Group, Inc., Humana Inc., CVS Health Corporation, Guidewell Mutual Holding Corporation. We compare all of them side by side at no cost.
How does the high percentage of age-65+ residents affect Medicare Supplement options?▾
With a significant portion of the population being over 65, many choose to supplement Original Medicare. Local carriers like UnitedHealthcare and Aetna offer Plans G, N, and high-deductible G tailored for Nassau County's retiree needs.
When is the best time to enroll in a Medicare Supplement plan?▾
You can enroll during Annual Enrollment Period (AEP) from Oct 15 to Dec 7 or during Special Enrollment Periods (SEPs) if you have a qualifying life event. Matt can help review your options year-round.
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