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Every Medicare market

All 53 jurisdictions and 3,199 counties. State figures are the CMS state record for April 2026; county figures are the CMS county records. Type to filter, or open the county explorer to rank and export.

Where the market is concentrated, growing and open

Largest markets

Medicare beneficiaries, CMS state record, April 2026

  1. California7,218,783
  2. Florida5,319,022
  3. Texas4,999,773
  4. New York4,042,202
  5. Pennsylvania3,030,753
  6. Ohio2,622,021
  7. Illinois2,480,946
  8. Michigan2,318,653
  9. North Carolina2,315,325
  10. Georgia2,023,250
  11. New Jersey1,835,997
  12. Virginia1,751,192

Highest MA & other health plan share

CMS state record, April 2026

  1. Puerto Rico86.7%
  2. Michigan63.6%
  3. Alabama61.4%
  4. Rhode Island59.9%
  5. Maine58.9%
  6. North Carolina57.9%
  7. Louisiana57.8%
  8. Wisconsin57.5%
  9. Florida57.1%
  10. Connecticut56.8%
  11. Minnesota56.8%
  12. West Virginia56.7%

Fastest growing

12-month change in share, counties with 20,000+ beneficiaries

  1. Caddo Parish, LA+4.4 pts
  2. Webb County, TX+3.1 pts
  3. Craven County, NC+2.5 pts
  4. Onslow County, NC+2.5 pts
  5. San Juan County, NM+2.4 pts
  6. Carteret County, NC+2.3 pts
  7. Cumberland County, NJ+2.1 pts
  8. Cumberland County, NC+2.1 pts
  9. Lowndes County, GA+1.9 pts
  10. Calhoun County, AL+1.8 pts
  11. Vigo County, IN+1.8 pts
  12. Daviess County, KY+1.8 pts

Most headroom

Lowest share, counties with 20,000+ beneficiaries

  1. Anchorage Municipality, AK2.8%
  2. Shasta County, CA8.3%
  3. Humboldt County, CA9.0%
  4. Chittenden County, VT11.5%
  5. Butte County, CA12.4%
  6. Mendocino County, CA12.9%
  7. Monterey County, CA16.9%
  8. Berkshire County, MA16.9%
  9. St. Mary'S County, MD17.4%
  10. Howard County, MD19.7%
  11. Anne Arundel County, MD20.0%
  12. Santa Barbara County, CA20.3%

Largest and highest-share lists use the CMS state records; growth and headroom use CMS county records, limited to counties with at least 20,000 Medicare beneficiaries so a small county cannot top the list on noise. Rank and export all 3,199 counties →

Every state and territory

Alabama 61.4%

67 Alabama counties, with April 2026 penetration and 12-month momentum, are in the county explorer. State overview →

Alaska 2.8%

19 Alaska counties, with April 2026 penetration and 12-month momentum, are in the county explorer. State overview →

Arizona 51.4%4 of 15 counties
Pinal 57.2% Pima 57.5% Maricopa 51.2% Coconino 33.4%
Arkansas 47.1%

75 Arkansas counties, with April 2026 penetration and 12-month momentum, are in the county explorer. State overview →

California 51.4%10 of 58 counties
Los Angeles 57.3% Riverside 63.2% Fresno 48.5% San Bernardino 67.3% San Diego 53.6% San Joaquin 54.8% Sacramento 62.1% Santa Clara 50.3% Orange 55.8% Alameda 52.5%
Colorado 52.3%

64 Colorado counties, with April 2026 penetration and 12-month momentum, are in the county explorer. State overview →

Connecticut 56.8%

9 Connecticut counties, with April 2026 penetration and 12-month momentum, are in the county explorer. State overview →

Delaware 32.7%

3 Delaware counties, with April 2026 penetration and 12-month momentum, are in the county explorer. State overview →

District of Columbia 34.4%

1 District of Columbia counties, with April 2026 penetration and 12-month momentum, are in the county explorer. State overview →

Florida 57.1%10 of 67 counties
Miami-Dade 75.4% Citrus 58.3% Broward 64.9% Palm Beach 48.1% Brevard 51.0% Lake 57.3% Hillsborough 62.3% Orange 61.6% Duval 53.3% Alachua 41.8%
Georgia 56.2%6 of 159 counties
Towns 51.0% Richmond 61.1% DeKalb 59.6% Fulton 54.2% Cobb 49.1% Gwinnett 58.4%
Hawaii 53.4%

4 Hawaii counties, with April 2026 penetration and 12-month momentum, are in the county explorer. State overview →

Idaho 46.0%

44 Idaho counties, with April 2026 penetration and 12-month momentum, are in the county explorer. State overview →

Illinois 43.8%6 of 102 counties
Winnebago 58.7% Cook 44.8% Will 41.8% DuPage 37.9% Kane 40.4% LaSalle 35.7%
Indiana 50.9%

92 Indiana counties, with April 2026 penetration and 12-month momentum, are in the county explorer. State overview →

Iowa 37.7%

99 Iowa counties, with April 2026 penetration and 12-month momentum, are in the county explorer. State overview →

Kansas 33.5%

98 Kansas counties, with April 2026 penetration and 12-month momentum, are in the county explorer. State overview →

Kentucky 55.4%

120 Kentucky counties, with April 2026 penetration and 12-month momentum, are in the county explorer. State overview →

Louisiana 57.8%

64 Louisiana counties, with April 2026 penetration and 12-month momentum, are in the county explorer. State overview →

Maine 58.9%

16 Maine counties, with April 2026 penetration and 12-month momentum, are in the county explorer. State overview →

Maryland 25.0%

24 Maryland counties, with April 2026 penetration and 12-month momentum, are in the county explorer. State overview →

Massachusetts 35.8%

14 Massachusetts counties, with April 2026 penetration and 12-month momentum, are in the county explorer. State overview →

Michigan 63.6%5 of 83 counties
Wayne 64.9% Macomb 60.4% Oakland 55.6% Kent 73.5% Benzie 60.8%
Minnesota 56.8%

87 Minnesota counties, with April 2026 penetration and 12-month momentum, are in the county explorer. State overview →

Mississippi 45.2%

82 Mississippi counties, with April 2026 penetration and 12-month momentum, are in the county explorer. State overview →

Missouri 54.5%

115 Missouri counties, with April 2026 penetration and 12-month momentum, are in the county explorer. State overview →

Montana 29.9%

53 Montana counties, with April 2026 penetration and 12-month momentum, are in the county explorer. State overview →

Nebraska 34.3%

90 Nebraska counties, with April 2026 penetration and 12-month momentum, are in the county explorer. State overview →

Nevada 52.1%

17 Nevada counties, with April 2026 penetration and 12-month momentum, are in the county explorer. State overview →

New Hampshire 31.3%

10 New Hampshire counties, with April 2026 penetration and 12-month momentum, are in the county explorer. State overview →

New Jersey 41.4%

21 New Jersey counties, with April 2026 penetration and 12-month momentum, are in the county explorer. State overview →

New Mexico 50.8%

33 New Mexico counties, with April 2026 penetration and 12-month momentum, are in the county explorer. State overview →

New York 53.5%7 of 62 counties
Bronx 71.2% Queens 60.9% Kings 57.5% Nassau 33.4% New York 47.3% Suffolk 30.1% Monroe 76.8%
North Carolina 57.9%6 of 100 counties
Guilford 70.8% Forsyth 68.2% Mecklenburg 55.3% Durham 51.9% Wake 52.6% Greene 61.3%
North Dakota 35.5%

53 North Dakota counties, with April 2026 penetration and 12-month momentum, are in the county explorer. State overview →

Ohio 56.6%6 of 88 counties
Lucas 58.3% Cuyahoga 57.6% Hamilton 56.5% Summit 63.6% Franklin 56.0% Ashtabula 53.9%
Oklahoma 42.4%

77 Oklahoma counties, with April 2026 penetration and 12-month momentum, are in the county explorer. State overview →

Oregon 53.9%

36 Oregon counties, with April 2026 penetration and 12-month momentum, are in the county explorer. State overview →

Pennsylvania 54.5%8 of 67 counties
Philadelphia 60.4% Allegheny 68.8% Beaver 71.6% Montgomery 37.1% Bucks 41.1% Chester 32.7% Erie 65.3% Crawford 57.4%
Puerto Rico 86.7%

78 Puerto Rico counties, with April 2026 penetration and 12-month momentum, are in the county explorer. State overview →

Rhode Island 59.9%

5 Rhode Island counties, with April 2026 penetration and 12-month momentum, are in the county explorer. State overview →

South Carolina 46.7%

46 South Carolina counties, with April 2026 penetration and 12-month momentum, are in the county explorer. State overview →

South Dakota 35.7%

66 South Dakota counties, with April 2026 penetration and 12-month momentum, are in the county explorer. State overview →

Tennessee 53.6%

95 Tennessee counties, with April 2026 penetration and 12-month momentum, are in the county explorer. State overview →

Texas 54.8%8 of 253 counties
El Paso 74.4% Bexar 58.7% Galveston 56.3% Harris 61.1% Lubbock 52.4% Dallas 54.9% Tarrant 55.9% Travis 47.7%
Utah 54.9%

29 Utah counties, with April 2026 penetration and 12-month momentum, are in the county explorer. State overview →

Vermont 12.7%

14 Vermont counties, with April 2026 penetration and 12-month momentum, are in the county explorer. State overview →

Virginia 39.5%

133 Virginia counties, with April 2026 penetration and 12-month momentum, are in the county explorer. State overview →

Washington 49.8%

39 Washington counties, with April 2026 penetration and 12-month momentum, are in the county explorer. State overview →

West Virginia 56.7%

55 West Virginia counties, with April 2026 penetration and 12-month momentum, are in the county explorer. State overview →

Wisconsin 57.5%

72 Wisconsin counties, with April 2026 penetration and 12-month momentum, are in the county explorer. State overview →

Wyoming 15.5%

23 Wyoming counties, with April 2026 penetration and 12-month momentum, are in the county explorer. State overview →

Explore all 3,199 counties →  filter by share, momentum and market size. Weighing more than one? Compare markets side by side →