Quick answer
Among the 40 counties below, Los Angeles County, CA has the most Medicare Advantage plans for 2027 (70) and Contra Costa County, CA has the fewest (5). The share of plans with a $0 monthly premium runs from 39% in Suffolk County, NY to 92% in Clark County, NV. Figures come from the CMS CY2027 landscape (release 202609.1, data last updated September 22, 2026) and the 2027 Star Ratings (October 8, 2026).
We do not offer every plan available in your area. Currently we represent a small number of insurance agencies and the plans they carry. Please contact Medicare.gov, 1-800-MEDICARE (TTY 1-877-486-2048), 24 hours a day / 7 days a week, or your local State Health Insurance Assistance Program (SHIP) to get information on all of your options.
We are an independent information and referral resource. We are not connected with, endorsed by, or acting on behalf of the United States government, the Centers for Medicare & Medicaid Services, or the federal Medicare program. Calling a number on this page connects you with a licensed insurance agent or a third-party marketing partner.
2027 Medicare Advantage numbers by county
Plans are Medicare Advantage and Medicare Advantage with drug coverage plans open to everyone with Medicare, counted from the CMS landscape file. Choose a county for the full breakdown by plan type and insurer, how it compares with the rest of its state, and the state's free SHIP counseling line.
| County | Population (2025 est.) | Plans | $0 premium | Insurers | Out-of-pocket max | Plans with 4+ stars |
|---|---|---|---|---|---|---|
| Los Angeles County, CA | 9,694,934 | 70 | 60 | 17 | $199 to $9,850 | 30 of 63 |
| Cook County, IL | 5,194,625 | 48 | 39 | 9 | $2,150 to $9,850 | 24 of 48 |
| Harris County, TX | 5,045,026 | 49 | 41 | 11 | $1,500 to $9,850 | 24 of 46 |
| Maricopa County, AZ | 4,689,558 | 52 | 46 | 13 | $2,000 to $8,900 | 28 of 50 |
| San Diego County, CA | 3,282,248 | 46 | 37 | 14 | $295 to $9,850 | 20 of 44 |
| Orange County, CA | 3,149,507 | 62 | 54 | 15 | $295 to $9,850 | 26 of 55 |
| Miami-Dade County, FL | 2,802,029 | 41 | 35 | 12 | $500 to $9,850 | 33 of 41 |
| Dallas County, TX | 2,661,397 | 42 | 29 | 8 | $2,399 to $9,850 | 22 of 42 |
| Kings County, NY | 2,653,963 | 37 | 22 | 11 | $4,950 to $9,850 | 12 of 34 |
| Riverside County, CA | 2,544,916 | 47 | 43 | 16 | $295 to $9,850 | 21 of 43 |
| Clark County, NV | 2,407,226 | 39 | 36 | 9 | $900 to $7,150 | 27 of 38 |
| Queens County, NY | 2,358,182 | 30 | 16 | 11 | $6,800 to $9,850 | 11 of 27 |
| King County, WA | 2,344,939 | 30 | 18 | 6 | $3,150 to $9,850 | 19 of 26 |
| Tarrant County, TX | 2,248,466 | 40 | 28 | 8 | $2,399 to $9,850 | 20 of 40 |
| San Bernardino County, CA | 2,224,091 | 49 | 44 | 15 | $295 to $9,850 | 21 of 46 |
| Bexar County, TX | 2,160,088 | 48 | 37 | 11 | $2,800 to $9,850 | 26 of 45 |
| Broward County, FL | 2,013,317 | 44 | 38 | 12 | $750 to $9,850 | 34 of 44 |
| Santa Clara County, CA | 1,914,391 | 19 | 10 | 7 | $295 to $9,850 | 10 of 19 |
| Middlesex County, MA | 1,669,979 | 33 | 15 | 7 | $3,400 to $9,850 | 23 of 32 |
| New York County, NY | 1,664,862 | 26 | 15 | 10 | $4,950 to $9,850 | 7 of 26 |
| Alameda County, CA | 1,636,630 | 16 | 9 | 8 | $295 to $9,850 | 7 of 16 |
| Sacramento County, CA | 1,618,460 | 16 | 10 | 7 | $295 to $9,850 | 7 of 16 |
| Palm Beach County, FL | 1,575,726 | 49 | 42 | 12 | $750 to $9,850 | 38 of 49 |
| Philadelphia County, PA | 1,574,281 | 63 | 40 | 13 | $4,150 to $9,850 | 39 of 62 |
| Hillsborough County, FL | 1,574,115 | 52 | 47 | 15 | $1,000 to $9,850 | 39 of 52 |
| Suffolk County, NY | 1,546,090 | 18 | 7 | 7 | $6,800 to $9,850 | 10 of 18 |
| Orange County, FL | 1,528,002 | 45 | 40 | 14 | $1,000 to $9,850 | 34 of 45 |
| Bronx County, NY | 1,406,332 | 31 | 17 | 10 | $4,950 to $9,850 | 12 of 31 |
| Nassau County, NY | 1,398,939 | 28 | 15 | 9 | $6,800 to $9,850 | 10 of 25 |
| Travis County, TX | 1,389,670 | 28 | 20 | 5 | $3,900 to $9,850 | 15 of 28 |
| Collin County, TX | 1,297,179 | 40 | 28 | 8 | $2,399 to $9,850 | 22 of 40 |
| Hennepin County, MN | 1,284,784 | 18 | 9 | 5 | $3,900 to $9,850 | 11 of 18 |
| Wake County, NC | 1,257,235 | 35 | 28 | 6 | $3,400 to $9,850 | 24 of 34 |
| Mecklenburg County, NC | 1,233,383 | 50 | 41 | 9 | $3,500 to $9,850 | 36 of 50 |
| Cuyahoga County, OH | 1,232,925 | 66 | 40 | 11 | $3,000 to $9,850 | 46 of 65 |
| Allegheny County, PA | 1,225,035 | 60 | 34 | 10 | $4,150 to $9,850 | 44 of 59 |
| Contra Costa County, CA | 1,170,070 | 5 | 2 | 3 | $295 to $6,750 | 4 of 5 |
| Fairfax County, VA | 1,167,873 | 25 | 14 | 6 | $5,900 to $9,850 | 17 of 24 |
| Fulton County, GA | 1,098,791 | 52 | 43 | 9 | $3,400 to $9,850 | 28 of 52 |
| Pima County, AZ | 1,074,685 | 52 | 46 | 12 | $1,899 to $8,900 | 27 of 50 |
Counties by state
Arizona
California
- Los Angeles County
- San Diego County
- Orange County
- Riverside County
- San Bernardino County
- Santa Clara County
- Alameda County
- Sacramento County
- Contra Costa County
Florida
Georgia
Illinois
Massachusetts
Minnesota
Nevada
New York
North Carolina
Ohio
Pennsylvania
Texas
Virginia
Washington
How to use these pages
- Open enrollment runs October 15 to December 7, 2026. Plan changes take effect January 1, 2027.
- Start with your doctors and drugs. A plan with a lower premium is not a better fit if your doctor is out of network or a prescription is not covered.
- Compare the out-of-pocket maximum along with the premium, since it caps what covered care can cost in a year.
- Check your exact ZIP code. County totals are a starting point; the ZIP code lookup shows plan counts for your ZIP code.
Questions about these county pages
Which counties have a Medicare Advantage page here?
The 40 largest US counties by population (Census Vintage 2025 estimates) that have Medicare Advantage plans in the CMS 2027 landscape and whose plan data is not identical to another county's. They are in 15 states.
Why are some large counties missing?
A county is listed only when its CMS plan data differs from every other county's. Wayne County, MI, Franklin County, OH, Oakland County, MI, and Salt Lake County, UT have the same general Medicare Advantage plan list as at least one other county, so they are left out here.
Where do the numbers come from?
From the CMS Medicare Advantage and Part D Landscape source file for contract year 2027 (release 202609.1, data last updated September 22, 2026) and the CMS 2027 Star Ratings tables (October 8, 2026). Each county page lists its sources and what is counted.
How do I see plans for a county that is not listed?
Use the ZIP code lookup on this site for plan counts by ZIP code, or Plan Finder at Medicare.gov. Your State Health Insurance Assistance Program (SHIP) gives free help comparing plans.
Sources and what is counted
Source: CMS Medicare Advantage and Part D Landscape source file, contract year 2027, release 202609.1 (file cy2027-landscape-202609-1.zip, CY2027_Landscape_202609.csv), data last updated September 22, 2026; CMS 2027 Part C and D Star Ratings data tables (Summary Ratings table), October 8, 2026; U.S. Census Bureau Vintage 2025 county population estimates (July 1, 2025). Plans counted by Senior Transition Assistance.
Counties are listed by population, largest first. A county page is published only when its CMS plan data is not identical to any other county's. Special needs plans, cost plans, employer-only plans and stand-alone Part D plans are not in the counts, and they are not part of that comparison.