ACA Health Insurance 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 about 104,400 residents per the 2024 ACS 5-year estimates (25% age 65 or older). The leading insurance carriers serving the county for aca health insurance include UnitedHealthcare, Aetna, Humana. We compare options at no cost to you.
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The Nassau County aca health insurance market
Nassau County has about 104,400 residents, 25% of them 65 or older. For aca health insurance, the carriers with the strongest local presence include UnitedHealthcare, Aetna, Humana — but the right fit depends on your household size, income, and which doctors you want to keep. We compare UnitedHealthcare against every other carrier serving Nassau County at no cost, because the plan with the lowest sticker premium is rarely the one with the lowest total annual cost once subsidies, deductibles, and your prescriptions are factored in. 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 carriers 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 ACA Health Insurance 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.
Major hospitals: Baptist Medical Center Nassau, UF Health North (Jacksonville), Baptist Medical Center Jacksonville
Frequently Asked Questions
How many people live in Nassau County?▾
Nassau County has about 104,400 residents per the 2024 ACS 5-year estimates; 25% are age 65 or older.
Who are the top insurers 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 state 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 does Nassau County's high percentage of seniors affect ACA plans?▾
Nassau County has a significant number of residents aged 65+, making it essential to choose plans that offer comprehensive coverage, especially for those with pre-existing conditions. UnitedHealthcare is one of the top carriers here.
When can I enroll in ACA plans this year?▾
Open Enrollment Period (OEP) runs from November 1 to December 15, and Annual Enrollment Period (AEP) is October 15 to December 7. Special Enrollments are available for qualifying life events.
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Educational only — not medical or legal advice. We do not offer every plan in your area. Call 1-800-MEDICARE for all options.
