HealthPlan Connect Research
2026 Medicare County Benchmark Explorer
Compare 2,127 counties by Medicare beneficiaries, state share and Medicare Advantage penetration using HealthPlan Connect's CMS-derived evidence corpus.
| County | State | Rank | Beneficiaries | State share | MA % | Vs state |
|---|---|---|---|---|---|---|
| Los Angeles County | California | #1 | 1,710,694 | 23.67% | 57.2% | +5.7 pts |
| Cook County | Illinois | #1 | 888,191 | 35.77% | 44.9% | +1 pts |
| Maricopa County | Arizona | #1 | 814,285 | 52.28% | 51.2% | -0.3 pts |
| Harris County | Texas | #1 | 662,181 | 13.23% | 61% | +6.2 pts |
| San Diego County | California | #2 | 623,996 | 8.63% | 53.5% | +2 pts |
| Orange County | California | #3 | 604,560 | 8.37% | 55.7% | +4.2 pts |
| Miami-Dade County | Florida | #1 | 523,657 | 9.84% | 75.3% | +18.1 pts |
| Riverside County | California | #4 | 453,651 | 6.28% | 63.1% | +11.6 pts |
| Queens County | New York | #1 | 422,158 | 10.43% | 61% | +7.4 pts |
| Kings County | New York | #2 | 413,074 | 10.21% | 57.6% | +4 pts |
| Broward County | Florida | #2 | 379,274 | 7.12% | 64.9% | +7.7 pts |
| Palm Beach County | Florida | #3 | 370,018 | 6.95% | 48.1% | -9.1 pts |
| Dallas County | Texas | #2 | 365,818 | 7.31% | 54.8% | 0 pts |
| Wayne County | Michigan | #1 | 352,785 | 15.2% | 64.6% | +1 pts |
| San Bernardino County | California | #5 | 349,582 | 4.84% | 67.3% | +15.8 pts |
| Bexar County | Texas | #3 | 341,225 | 6.82% | 58.7% | +3.9 pts |
| Suffolk County | New York | #3 | 335,552 | 8.29% | 30.1% | -23.5 pts |
| Tarrant County | Texas | #4 | 325,266 | 6.5% | 55.8% | +1 pts |
| Santa Clara County | California | #6 | 312,786 | 4.33% | 50.3% | -1.2 pts |
| Nassau County | New York | #4 | 303,866 | 7.51% | 33.4% | -20.2 pts |
| New York County | New York | #5 | 299,641 | 7.4% | 47.3% | -6.3 pts |
| Sacramento County | California | #7 | 295,146 | 4.08% | 62.2% | +10.7 pts |
| Allegheny County | Pennsylvania | #1 | 283,429 | 9.35% | 68.7% | +14.1 pts |
| Cuyahoga County | Ohio | #1 | 281,117 | 10.71% | 57.5% | +0.9 pts |
| Oakland County | Michigan | #2 | 278,617 | 12.01% | 55.6% | -8 pts |
| Alameda County | California | #8 | 278,052 | 3.85% | 52.5% | +1 pts |
| Hillsborough County | Florida | #4 | 274,926 | 5.16% | 62.3% | +5.1 pts |
| Philadelphia County | Pennsylvania | #2 | 266,263 | 8.78% | 60.4% | +5.8 pts |
| Pinellas County | Florida | #5 | 263,616 | 4.95% | 60.5% | +3.3 pts |
| Pima County | Arizona | #2 | 262,926 | 16.88% | 57.5% | +6 pts |
| Bronx County | New York | #6 | 233,387 | 5.77% | 71.2% | +17.6 pts |
| Contra Costa County | California | #9 | 228,656 | 3.16% | 52% | +0.5 pts |
| St. Louis County | Missouri | #1 | 227,894 | 16.64% | 57.4% | +2.8 pts |
| Orange County | Florida | #6 | 227,570 | 4.27% | 61.5% | +4.3 pts |
| Lee County | Florida | #7 | 225,768 | 4.24% | 50.2% | -7 pts |
| Erie County | New York | #7 | 217,820 | 5.38% | 71.5% | +17.9 pts |
| Franklin County | Ohio | #2 | 210,709 | 8.03% | 56% | -0.6 pts |
| Montgomery County | Maryland | #1 | 199,013 | 16.64% | 22.5% | -2.5 pts |
| Westchester County | New York | #8 | 198,793 | 4.91% | 39% | -14.6 pts |
| Macomb County | Michigan | #3 | 198,702 | 8.56% | 60.2% | -3.4 pts |
| Duval County | Florida | #8 | 195,672 | 3.68% | 53.3% | -3.9 pts |
| Bergen County | New Jersey | #1 | 194,498 | 10.58% | 36.6% | -4.9 pts |
| Montgomery County | Pennsylvania | #3 | 192,771 | 6.36% | 37.1% | -17.5 pts |
| Wake County | North Carolina | #1 | 191,361 | 8.26% | 52.4% | -5.5 pts |
| Dupage County | Illinois | #2 | 186,626 | 7.52% | 37.9% | -6 pts |
| Fairfax County | Virginia | #1 | 185,280 | 10.57% | 31.9% | -7.7 pts |
| Polk County | Florida | #9 | 183,125 | 3.44% | 68.5% | +11.3 pts |
| Brevard County | Florida | #10 | 183,117 | 3.44% | 51% | -6.2 pts |
| Ventura County | California | #10 | 177,511 | 2.46% | 41.2% | -10.3 pts |
| Monroe County | New York | #9 | 175,609 | 4.34% | 76.8% | +23.2 pts |
| Baltimore County | Maryland | #2 | 174,482 | 14.58% | 25.9% | +0.9 pts |
| Volusia County | Florida | #11 | 173,260 | 3.25% | 60.8% | +3.6 pts |
| Ocean County | New Jersey | #2 | 169,248 | 9.21% | 38.5% | -3 pts |
| Mecklenburg County | North Carolina | #2 | 168,230 | 7.26% | 55.3% | -2.6 pts |
| Shelby County | Tennessee | #1 | 167,578 | 10.98% | 48.1% | -5.5 pts |
| Sarasota County | Florida | #12 | 166,491 | 3.13% | 42.8% | -14.4 pts |
| Milwaukee County | Wisconsin | #1 | 165,717 | 12.09% | 67.7% | +10.2 pts |
| Hamilton County | Ohio | #3 | 164,658 | 6.28% | 56.5% | -0.1 pts |
| Fulton County | Georgia | #1 | 163,879 | 8.09% | 54.1% | -2.1 pts |
| Jefferson County | Kentucky | #1 | 162,265 | 16.09% | 50.4% | -5.1 pts |
| Fresno County | California | #11 | 161,314 | 2.23% | 48.5% | -3 pts |
| Collin County | Texas | #5 | 160,886 | 3.21% | 43.1% | -11.7 pts |
| Travis County | Texas | #6 | 160,791 | 3.21% | 47.7% | -7.1 pts |
| Marion County | Indiana | #1 | 159,685 | 11.22% | 57.7% | +6.8 pts |
| San Francisco County | California | #12 | 159,577 | 2.21% | 51.4% | -0.1 pts |
| Bucks County | Pennsylvania | #4 | 159,401 | 5.26% | 41% | -13.6 pts |
| Middlesex County | New Jersey | #3 | 157,578 | 8.57% | 41.3% | -0.2 pts |
| Prince George'S County | Maryland | #3 | 155,628 | 13.01% | 31.6% | +6.6 pts |
| El Paso County | Texas | #7 | 153,898 | 3.08% | 74.5% | +19.7 pts |
| Pasco County | Florida | #13 | 153,109 | 2.88% | 67.3% | +10.1 pts |
| Monmouth County | New Jersey | #4 | 148,379 | 8.07% | 31.2% | -10.3 pts |
| Oklahoma County | Oklahoma | #1 | 147,031 | 17.75% | 45.5% | +3 pts |
| San Mateo County | California | #13 | 143,457 | 1.98% | 50.9% | -0.6 pts |
| Jefferson County | Alabama | #1 | 138,948 | 12.17% | 66.9% | +5.4 pts |
| Horry County | South Carolina | #1 | 137,613 | 10.73% | 45.5% | -1.2 pts |
| Jackson County | Missouri | #2 | 136,624 | 9.98% | 56.4% | +1.8 pts |
| Fort Bend County | Texas | #8 | 136,549 | 2.73% | 55.7% | +0.9 pts |
| Denton County | Texas | #9 | 136,244 | 2.72% | 44.8% | -10 pts |
| Lake County | Illinois | #3 | 135,916 | 5.47% | 34.3% | -9.6 pts |
| Kern County | California | #14 | 135,279 | 1.87% | 47.5% | -4 pts |
| Marion County | Florida | #14 | 135,278 | 2.54% | 60.9% | +3.7 pts |
| Gwinnett County | Georgia | #2 | 132,382 | 6.54% | 58.4% | +2.2 pts |
| El Paso County | Colorado | #1 | 130,939 | 12.05% | 51% | -1.3 pts |
| Essex County | New Jersey | #5 | 129,596 | 7.05% | 49.8% | +8.3 pts |
| San Joaquin County | California | #15 | 129,145 | 1.79% | 54.8% | +3.3 pts |
| Tulsa County | Oklahoma | #2 | 128,906 | 15.56% | 52.1% | +9.6 pts |
| Lake County | Florida | #15 | 127,458 | 2.39% | 57.3% | +0.1 pts |
| Summit County | Ohio | #4 | 126,604 | 4.83% | 63.5% | +6.9 pts |
| Lancaster County | Pennsylvania | #5 | 126,578 | 4.17% | 51.7% | -2.9 pts |
| Kent County | Michigan | #4 | 126,075 | 5.43% | 73.4% | +9.8 pts |
| Hidalgo County | Texas | #10 | 125,414 | 2.51% | 77.4% | +22.6 pts |
| Will County | Illinois | #4 | 124,741 | 5.02% | 41.8% | -2.1 pts |
| Jefferson County | Colorado | #2 | 124,374 | 11.45% | 61.9% | +9.6 pts |
| Manatee County | Florida | #16 | 124,258 | 2.33% | 48.8% | -8.4 pts |
| Cobb County | Georgia | #3 | 123,628 | 6.11% | 49.1% | -7.1 pts |
| Collier County | Florida | #17 | 123,162 | 2.31% | 37.5% | -19.7 pts |
| Sonoma County | California | #16 | 122,394 | 1.69% | 53.2% | +1.7 pts |
| Delaware County | Pennsylvania | #6 | 122,049 | 4.02% | 40.6% | -14 pts |
| Montgomery County | Texas | #11 | 121,779 | 2.43% | 52.4% | -2.4 pts |
| Greenville County | South Carolina | #2 | 120,602 | 9.4% | 49% | +2.3 pts |
| Montgomery County | Ohio | #5 | 120,358 | 4.59% | 61% | +4.4 pts |
| DeKalb County | Georgia | #4 | 120,272 | 5.94% | 59.6% | +3.4 pts |
| Chester County | Pennsylvania | #7 | 114,852 | 3.79% | 32.6% | -22 pts |
| Guilford County | North Carolina | #3 | 112,147 | 4.84% | 70.7% | +12.8 pts |
| Anne Arundel County | Maryland | #4 | 110,023 | 9.2% | 20% | -5 pts |
| Arapahoe County | Colorado | #3 | 108,295 | 9.97% | 57.5% | +5.2 pts |
| Pinal County | Arizona | #3 | 107,775 | 6.92% | 57.1% | +5.6 pts |
| York County | Pennsylvania | #8 | 107,178 | 3.53% | 52.6% | -2 pts |
| Morris County | New Jersey | #6 | 106,843 | 5.81% | 32.9% | -8.6 pts |
| Camden County | New Jersey | #7 | 106,433 | 5.79% | 45.7% | +4.2 pts |
| Davidson County | Tennessee | #2 | 106,424 | 6.97% | 55.7% | +2.1 pts |
| Waukesha County | Wisconsin | #2 | 106,064 | 7.74% | 60.1% | +2.6 pts |
| Williamson County | Texas | #12 | 105,906 | 2.12% | 46.8% | -8 pts |
| Dane County | Wisconsin | #3 | 105,878 | 7.72% | 38.7% | -18.8 pts |
| Lake County | Indiana | #2 | 105,675 | 7.42% | 46.1% | -4.8 pts |
| Onondaga County | New York | #10 | 104,822 | 2.59% | 62.9% | +9.3 pts |
| Baltimore City | Maryland | #5 | 104,334 | 8.72% | 36.6% | +11.6 pts |
| Burlington County | New Jersey | #8 | 103,857 | 5.65% | 42.4% | +0.9 pts |
| Westmoreland County | Pennsylvania | #9 | 102,542 | 3.38% | 71.8% | +17.2 pts |
| Placer County | California | #17 | 102,498 | 1.42% | 56.3% | +4.8 pts |
| St. Lucie County | Florida | #18 | 100,258 | 1.88% | 56.6% | -0.6 pts |
| Richmond County | New York | #11 | 99,732 | 2.46% | 47.2% | -6.4 pts |
| Knox County | Tennessee | #3 | 99,456 | 6.52% | 53.6% | 0 pts |
| Denver County | Colorado | #4 | 97,706 | 8.99% | 60% | +7.7 pts |
| Genesee County | Michigan | #5 | 97,447 | 4.2% | 69% | +5.4 pts |
| Union County | New Jersey | #9 | 97,359 | 5.3% | 46.7% | +5.2 pts |
| Stanislaus County | California | #18 | 96,432 | 1.33% | 57.9% | +6.4 pts |
| Yavapai County | Arizona | #4 | 96,214 | 6.18% | 42% | -9.5 pts |
| Stark County | Ohio | #6 | 95,783 | 3.65% | 67.9% | +11.3 pts |
| Berks County | Pennsylvania | #10 | 94,760 | 3.12% | 46.8% | -7.8 pts |
| Jefferson Parish | Louisiana | #1 | 94,508 | 9.79% | 71.5% | +13.6 pts |
| Kane County | Illinois | #5 | 94,385 | 3.8% | 40.4% | -3.5 pts |
| Lucas County | Ohio | #7 | 93,931 | 3.58% | 58.2% | +1.6 pts |
| Passaic County | New Jersey | #10 | 93,672 | 5.1% | 48.9% | +7.4 pts |
| Solano County | California | #19 | 92,608 | 1.28% | 55.5% | +4 pts |
| Seminole County | Florida | #19 | 90,772 | 1.71% | 54.1% | -3.1 pts |
| Mobile County | Alabama | #2 | 90,609 | 7.94% | 70.9% | +9.4 pts |
| Sumter County | Florida | #20 | 90,447 | 1.7% | 56.7% | -0.5 pts |
| Hudson County | New Jersey | #11 | 89,003 | 4.84% | 55.2% | +13.7 pts |
| Virginia Beach city | Virginia | #2 | 87,768 | 5.01% | 35.7% | -3.9 pts |
| St. Charles County | Missouri | #3 | 87,075 | 6.36% | 60.7% | +6.1 pts |
| Santa Barbara County | California | #20 | 86,431 | 1.2% | 20.3% | -31.2 pts |
| Charleston County | South Carolina | #3 | 86,167 | 6.72% | 36.5% | -10.2 pts |
| Forsyth County | North Carolina | #4 | 85,225 | 3.68% | 68.1% | +10.2 pts |
| East Baton Rouge Parish | Louisiana | #2 | 83,865 | 8.69% | 65.2% | +7.3 pts |
| Hamilton County | Tennessee | #4 | 82,862 | 5.43% | 56.4% | +2.8 pts |
| Lehigh County | Pennsylvania | #11 | 81,694 | 2.69% | 48.1% | -6.5 pts |
| Charlotte County | Florida | #21 | 81,365 | 1.53% | 52.4% | -4.8 pts |
| Madison County | Alabama | #3 | 80,494 | 7.05% | 46.4% | -15.1 pts |
| Northampton County | Pennsylvania | #12 | 80,032 | 2.64% | 44.5% | -10.1 pts |
| St. Johns County | Florida | #22 | 79,937 | 1.5% | 38.6% | -18.6 pts |
| Mohave County | Arizona | #5 | 78,110 | 5.02% | 53% | +1.5 pts |
| Luzerne County | Pennsylvania | #13 | 77,909 | 2.57% | 45.6% | -9 pts |
| Richland County | South Carolina | #4 | 77,864 | 6.07% | 43.5% | -3.2 pts |
| Lorain County | Ohio | #8 | 77,812 | 2.97% | 58.3% | +1.7 pts |
| Larimer County | Colorado | #5 | 77,764 | 7.16% | 47.8% | -4.5 pts |
| Escambia County | Florida | #23 | 77,174 | 1.45% | 49.7% | -7.5 pts |
| Allen County | Indiana | #3 | 76,628 | 5.38% | 64.2% | +13.3 pts |
| Butler County | Ohio | #9 | 76,620 | 2.92% | 56% | -0.6 pts |
| Osceola County | Florida | #24 | 76,337 | 1.43% | 71.7% | +14.5 pts |
| Chesterfield County | Virginia | #3 | 76,172 | 4.35% | 38.6% | -1 pts |
| Spartanburg County | South Carolina | #5 | 76,022 | 5.93% | 54.4% | +7.7 pts |
| Monterey County | California | #21 | 74,872 | 1.04% | 17% | -34.5 pts |
| San Luis Obispo County | California | #22 | 74,065 | 1.02% | 24.4% | -27.1 pts |
| Cameron County | Texas | #13 | 73,363 | 1.47% | 74.5% | +19.7 pts |
| Orange County | New York | #12 | 72,968 | 1.8% | 38.2% | -15.4 pts |
| Mercer County | New Jersey | #12 | 72,465 | 3.94% | 45.8% | +4.3 pts |
| Adams County | Colorado | #6 | 72,030 | 6.63% | 64.6% | +12.3 pts |
| Tulare County | California | #23 | 71,053 | 0.98% | 37.3% | -14.2 pts |
| Galveston County | Texas | #14 | 70,621 | 1.41% | 56.2% | +1.4 pts |
| Orleans Parish | Louisiana | #3 | 69,721 | 7.22% | 68.6% | +10.7 pts |
| Dutchess County | New York | #13 | 68,835 | 1.7% | 41.7% | -11.9 pts |
| Washtenaw County | Michigan | #6 | 68,625 | 2.96% | 59.9% | -3.7 pts |
| Brunswick County | North Carolina | #5 | 68,040 | 2.94% | 44.5% | -13.4 pts |
| Lexington County | South Carolina | #6 | 67,955 | 5.3% | 41.5% | -5.2 pts |
| Henrico County | Virginia | #4 | 67,598 | 3.86% | 40.9% | +1.3 pts |
| Nueces County | Texas | #15 | 67,531 | 1.35% | 65.2% | +10.4 pts |
| Citrus County | Florida | #25 | 67,348 | 1.27% | 58.4% | +1.2 pts |
| Mchenry County | Illinois | #6 | 67,195 | 2.71% | 36.5% | -7.4 pts |
| Buncombe County | North Carolina | #6 | 67,180 | 2.9% | 48.6% | -9.3 pts |
| Baldwin County | Alabama | #4 | 66,976 | 5.87% | 57.9% | -3.6 pts |
| Albany County | New York | #14 | 66,936 | 1.65% | 56.8% | +3.2 pts |
| Atlantic County | New Jersey | #13 | 66,681 | 3.63% | 43.9% | +2.4 pts |
| Somerset County | New Jersey | #14 | 66,549 | 3.62% | 35.6% | -5.9 pts |
| Douglas County | Colorado | #7 | 66,167 | 6.09% | 51.1% | -1.2 pts |
| Erie County | Pennsylvania | #14 | 65,909 | 2.17% | 65.3% | +10.7 pts |
| Prince William County | Virginia | #5 | 65,720 | 3.75% | 36.9% | -2.7 pts |
| Gloucester County | New Jersey | #15 | 65,040 | 3.54% | 43.3% | +1.8 pts |
| Marin County | California | #24 | 64,872 | 0.9% | 45.1% | -6.4 pts |
| Greene County | Missouri | #4 | 64,834 | 4.73% | 61.9% | +7.3 pts |
| Brazoria County | Texas | #16 | 64,717 | 1.29% | 58.4% | +3.6 pts |
| Bell County | Texas | #17 | 64,441 | 1.29% | 52.2% | -2.6 pts |
| Hamilton County | Indiana | #4 | 63,756 | 4.48% | 43.1% | -7.8 pts |
| Winnebago County | Illinois | #7 | 63,653 | 2.56% | 58.7% | +14.8 pts |
| Hernando County | Florida | #26 | 63,492 | 1.19% | 67.9% | +10.7 pts |
| Beaufort County | South Carolina | #7 | 63,351 | 4.94% | 32.4% | -14.3 pts |
| Dauphin County | Pennsylvania | #15 | 63,153 | 2.08% | 61.3% | +6.7 pts |
| Ottawa County | Michigan | #7 | 63,111 | 2.72% | 77.2% | +13.6 pts |
| Indian River County | Florida | #27 | 63,068 | 1.18% | 42.9% | -14.3 pts |
| Boulder County | Colorado | #8 | 62,912 | 5.79% | 48.5% | -3.8 pts |
| St. Tammany Parish | Louisiana | #4 | 62,841 | 6.51% | 61.9% | +4 pts |
| Cumberland County | Pennsylvania | #16 | 62,512 | 2.06% | 53.3% | -1.3 pts |
| Cumberland County | North Carolina | #7 | 61,528 | 2.66% | 57.6% | -0.3 pts |
| Lake County | Ohio | #10 | 61,158 | 2.33% | 55.1% | -1.5 pts |
| Mahoning County | Ohio | #11 | 60,832 | 2.32% | 64.4% | +7.8 pts |
| Rockland County | New York | #15 | 60,380 | 1.49% | 32.7% | -20.9 pts |
| Santa Cruz County | California | #25 | 60,018 | 0.83% | 25.1% | -26.4 pts |
| Madison County | Illinois | #8 | 59,776 | 2.41% | 55.4% | +11.5 pts |
| Howard County | Maryland | #6 | 59,128 | 4.94% | 19.6% | -5.4 pts |
| Weld County | Colorado | #9 | 58,929 | 5.42% | 55.8% | +3.5 pts |
| Saratoga County | New York | #16 | 58,704 | 1.45% | 58.3% | +4.7 pts |
| York County | South Carolina | #8 | 57,869 | 4.51% | 46.6% | -0.1 pts |
| Chatham County | Georgia | #5 | 57,335 | 2.83% | 55% | -1.2 pts |
| Brown County | Wisconsin | #4 | 57,217 | 4.17% | 71.4% | +13.9 pts |
| Harford County | Maryland | #7 | 57,121 | 4.77% | 25% | 0 pts |
| Cherokee County | Georgia | #6 | 56,777 | 2.8% | 47.2% | -9 pts |
| Durham County | North Carolina | #8 | 56,346 | 2.43% | 51.8% | -6.1 pts |
| Washington County | Pennsylvania | #17 | 56,056 | 1.85% | 69% | +14.4 pts |
| Fayette County | Kentucky | #2 | 55,818 | 5.53% | 54.2% | -1.3 pts |
| Oneida County | New York | #17 | 55,764 | 1.38% | 55.8% | +2.2 pts |
| Lackawanna County | Pennsylvania | #18 | 55,706 | 1.84% | 45.1% | -9.5 pts |
| Niagara County | New York | #18 | 55,152 | 1.36% | 72.8% | +19.2 pts |
| New Hanover County | North Carolina | #9 | 55,063 | 2.38% | 45.6% | -12.3 pts |
| St. Joseph County | Indiana | #5 | 54,814 | 3.85% | 54.8% | +3.9 pts |
| Loudoun County | Virginia | #6 | 54,646 | 3.12% | 33.1% | -6.5 pts |
| Kalamazoo County | Michigan | #8 | 54,528 | 2.35% | 66.5% | +2.9 pts |
| Alachua County | Florida | #28 | 54,472 | 1.02% | 41.8% | -15.4 pts |
| Lubbock County | Texas | #18 | 54,408 | 1.09% | 52.3% | -2.5 pts |
| St. Clair County | Illinois | #9 | 54,255 | 2.18% | 56% | +12.1 pts |
| Trumbull County | Ohio | #12 | 53,631 | 2.04% | 63% | +6.4 pts |
| Rutherford County | Tennessee | #5 | 53,627 | 3.51% | 51.3% | -2.3 pts |
| Frederick County | Maryland | #8 | 53,627 | 4.48% | 20.4% | -4.6 pts |
| Leon County | Florida | #29 | 53,623 | 1.01% | 60.5% | +3.3 pts |
| Cleveland County | Oklahoma | #3 | 53,623 | 6.47% | 40.9% | -1.6 pts |
| Ingham County | Michigan | #9 | 53,577 | 2.31% | 67.4% | +3.8 pts |
| Smith County | Texas | #19 | 52,865 | 1.06% | 49.7% | -5.1 pts |
| Martin County | Florida | #30 | 52,823 | 0.99% | 40.8% | -16.4 pts |
| Caddo Parish | Louisiana | #5 | 52,705 | 5.46% | 55.3% | -2.6 pts |
| El Dorado County | California | #26 | 52,419 | 0.73% | 42.2% | -9.3 pts |
| Clay County | Florida | #31 | 52,234 | 0.98% | 43.2% | -14 pts |
| Butler County | Pennsylvania | #19 | 51,440 | 1.7% | 69.3% | +14.7 pts |
| McLennan County | Texas | #20 | 50,397 | 1.01% | 54.1% | -0.7 pts |
| Jefferson County | Missouri | #5 | 49,902 | 3.64% | 67.5% | +12.9 pts |
| Gaston County | North Carolina | #10 | 49,660 | 2.14% | 63.7% | +5.8 pts |
| Berkeley County | South Carolina | #9 | 49,529 | 3.86% | 43.5% | -3.2 pts |
| Shasta County | California | #27 | 49,261 | 0.68% | 8.3% | -43.2 pts |
| Anderson County | South Carolina | #10 | 49,246 | 3.84% | 54.5% | +7.8 pts |
| Clermont County | Ohio | #13 | 48,875 | 1.86% | 58.4% | +1.8 pts |
| Butte County | California | #28 | 48,828 | 0.68% | 12.4% | -39.1 pts |
| Clay County | Missouri | #6 | 48,796 | 3.56% | 48.3% | -6.3 pts |
Showing the 250 largest counties for readability; the underlying research corpus covers all 2,127 counties. Source: CMS Medicare Monthly Enrollment data.