Medicare in Illinois by county

Most people with Medicare

Across Illinois, 2,491,519 people had Medicare in July 2026, 44% of them in Medicare Advantage or another Medicare health plan. The counties with the most:

1. Cook County 891,197 with Medicare · 45% in Medicare Advantage · 42 Advantage plans with drug coverage
2. DuPage County 187,415 with Medicare · 38% in Medicare Advantage · 38 Advantage plans with drug coverage
3. Lake County 136,534 with Medicare · 34% in Medicare Advantage · 26 Advantage plans with drug coverage
4. Will County 125,542 with Medicare · 42% in Medicare Advantage · 39 Advantage plans with drug coverage
5. Kane County 94,908 with Medicare · 40% in Medicare Advantage · 34 Advantage plans with drug coverage
6. McHenry County 67,515 with Medicare · 37% in Medicare Advantage · 20 Advantage plans with drug coverage
7. Winnebago County 63,833 with Medicare · 59% in Medicare Advantage · 21 Advantage plans with drug coverage
8. Madison County 59,827 with Medicare · 55% in Medicare Advantage · 33 Advantage plans with drug coverage
9. St. Clair County 54,503 with Medicare · 56% in Medicare Advantage · 34 Advantage plans with drug coverage
10. Sangamon County 45,512 with Medicare · 59% in Medicare Advantage · 16 Advantage plans with drug coverage

All 102 counties, A to Z

• Adams County15,850 with Medicare · 38% in Medicare Advantage · 12 Advantage plans with drug coverage
• Alexander County1,478 with Medicare · 48% in Medicare Advantage · 14 Advantage plans with drug coverage
• Bond County3,855 with Medicare · 48% in Medicare Advantage · 30 Advantage plans with drug coverage
• Boone County11,054 with Medicare · 52% in Medicare Advantage · 21 Advantage plans with drug coverage
• Brown County1,135 with Medicare · 36% in Medicare Advantage · 10 Advantage plans with drug coverage
• Bureau County8,777 with Medicare · 32% in Medicare Advantage · 17 Advantage plans with drug coverage
• Calhoun County1,272 with Medicare · 39% in Medicare Advantage · 28 Advantage plans with drug coverage
• Carroll County4,497 with Medicare · 40% in Medicare Advantage · 13 Advantage plans with drug coverage
• Cass County2,731 with Medicare · 41% in Medicare Advantage · 13 Advantage plans with drug coverage
• Champaign County33,423 with Medicare · 59% in Medicare Advantage · 12 Advantage plans with drug coverage
• Christian County8,278 with Medicare · 48% in Medicare Advantage · 15 Advantage plans with drug coverage
• Clark County3,963 with Medicare · 43% in Medicare Advantage · 13 Advantage plans with drug coverage
• Clay County3,348 with Medicare · 25% in Medicare Advantage · 11 Advantage plans with drug coverage
• Clinton County8,479 with Medicare · 41% in Medicare Advantage · 32 Advantage plans with drug coverage
• Coles County10,625 with Medicare · 47% in Medicare Advantage · 11 Advantage plans with drug coverage
• Cook County891,197 with Medicare · 45% in Medicare Advantage · 42 Advantage plans with drug coverage
• Crawford County4,591 with Medicare · 26% in Medicare Advantage · 12 Advantage plans with drug coverage
• Cumberland County2,614 with Medicare · 43% in Medicare Advantage · 11 Advantage plans with drug coverage
• De Witt County3,891 with Medicare · 42% in Medicare Advantage · 13 Advantage plans with drug coverage
• DeKalb County19,174 with Medicare · 42% in Medicare Advantage · 16 Advantage plans with drug coverage
• Douglas County4,375 with Medicare · 50% in Medicare Advantage · 16 Advantage plans with drug coverage
• DuPage County187,415 with Medicare · 38% in Medicare Advantage · 38 Advantage plans with drug coverage
• Edgar County4,489 with Medicare · 35% in Medicare Advantage · 9 Advantage plans with drug coverage
• Edwards County1,569 with Medicare · 22% in Medicare Advantage · 10 Advantage plans with drug coverage
• Effingham County8,660 with Medicare · 27% in Medicare Advantage · 9 Advantage plans with drug coverage
• Fayette County4,569 with Medicare · 37% in Medicare Advantage · 16 Advantage plans with drug coverage
• Ford County3,344 with Medicare · 35% in Medicare Advantage · 11 Advantage plans with drug coverage
• Franklin County9,779 with Medicare · 42% in Medicare Advantage · 9 Advantage plans with drug coverage
• Fulton County8,469 with Medicare · 47% in Medicare Advantage · 13 Advantage plans with drug coverage
• Gallatin County1,352 with Medicare · 34% in Medicare Advantage · 9 Advantage plans with drug coverage
• Greene County3,066 with Medicare · 38% in Medicare Advantage · 19 Advantage plans with drug coverage
• Grundy County10,196 with Medicare · 36% in Medicare Advantage · 22 Advantage plans with drug coverage
• Hamilton County1,977 with Medicare · 31% in Medicare Advantage · 9 Advantage plans with drug coverage
• Hancock County4,915 with Medicare · 27% in Medicare Advantage · 10 Advantage plans with drug coverage
• Hardin County1,029 with Medicare · 32% in Medicare Advantage · 9 Advantage plans with drug coverage
• Henderson County1,778 with Medicare · 34% in Medicare Advantage · 14 Advantage plans with drug coverage
• Henry County12,390 with Medicare · 48% in Medicare Advantage · 18 Advantage plans with drug coverage
• Iroquois County7,277 with Medicare · 33% in Medicare Advantage · 15 Advantage plans with drug coverage
• Jackson County11,136 with Medicare · 51% in Medicare Advantage · 11 Advantage plans with drug coverage
• Jasper County2,362 with Medicare · 29% in Medicare Advantage · 11 Advantage plans with drug coverage
• Jefferson County8,808 with Medicare · 32% in Medicare Advantage · 9 Advantage plans with drug coverage
• Jersey County6,098 with Medicare · 47% in Medicare Advantage · 31 Advantage plans with drug coverage
• Jo Daviess County6,974 with Medicare · 58% in Medicare Advantage · 14 Advantage plans with drug coverage
• Johnson County3,212 with Medicare · 42% in Medicare Advantage · 12 Advantage plans with drug coverage
• Kane County94,908 with Medicare · 40% in Medicare Advantage · 34 Advantage plans with drug coverage
• Kankakee County23,550 with Medicare · 40% in Medicare Advantage · 29 Advantage plans with drug coverage
• Kendall County19,540 with Medicare · 41% in Medicare Advantage · 24 Advantage plans with drug coverage
• Knox County12,634 with Medicare · 46% in Medicare Advantage · 15 Advantage plans with drug coverage
• Lake County136,534 with Medicare · 34% in Medicare Advantage · 26 Advantage plans with drug coverage
• LaSalle County26,586 with Medicare · 36% in Medicare Advantage · 19 Advantage plans with drug coverage
• Lawrence County3,329 with Medicare · 27% in Medicare Advantage · 10 Advantage plans with drug coverage
• Lee County8,644 with Medicare · 41% in Medicare Advantage · 18 Advantage plans with drug coverage
• Livingston County8,462 with Medicare · 41% in Medicare Advantage · 13 Advantage plans with drug coverage
• Logan County6,320 with Medicare · 47% in Medicare Advantage · 13 Advantage plans with drug coverage
• Macon County24,504 with Medicare · 38% in Medicare Advantage · 11 Advantage plans with drug coverage
• Macoupin County11,923 with Medicare · 44% in Medicare Advantage · 21 Advantage plans with drug coverage
• Madison County59,827 with Medicare · 55% in Medicare Advantage · 33 Advantage plans with drug coverage
• Marion County10,000 with Medicare · 32% in Medicare Advantage · 10 Advantage plans with drug coverage
• Marshall County3,305 with Medicare · 39% in Medicare Advantage · 17 Advantage plans with drug coverage
• Mason County3,603 with Medicare · 42% in Medicare Advantage · 12 Advantage plans with drug coverage
• Massac County3,721 with Medicare · 31% in Medicare Advantage · 11 Advantage plans with drug coverage
• McDonough County6,034 with Medicare · 47% in Medicare Advantage · 12 Advantage plans with drug coverage
• McHenry County67,515 with Medicare · 37% in Medicare Advantage · 20 Advantage plans with drug coverage
• McLean County30,923 with Medicare · 44% in Medicare Advantage · 14 Advantage plans with drug coverage
• Menard County3,038 with Medicare · 55% in Medicare Advantage · 13 Advantage plans with drug coverage
• Mercer County4,065 with Medicare · 48% in Medicare Advantage · 13 Advantage plans with drug coverage
• Monroe County8,644 with Medicare · 54% in Medicare Advantage · 28 Advantage plans with drug coverage
• Montgomery County7,175 with Medicare · 41% in Medicare Advantage · 20 Advantage plans with drug coverage
• Morgan County8,151 with Medicare · 44% in Medicare Advantage · 13 Advantage plans with drug coverage
• Moultrie County3,227 with Medicare · 34% in Medicare Advantage · 15 Advantage plans with drug coverage
• Ogle County12,135 with Medicare · 48% in Medicare Advantage · 19 Advantage plans with drug coverage
• Peoria County38,198 with Medicare · 51% in Medicare Advantage · 15 Advantage plans with drug coverage
• Perry County4,780 with Medicare · 45% in Medicare Advantage · 14 Advantage plans with drug coverage
• Piatt County4,157 with Medicare · 55% in Medicare Advantage · 12 Advantage plans with drug coverage
• Pike County3,823 with Medicare · 31% in Medicare Advantage · 12 Advantage plans with drug coverage
• Pope County1,168 with Medicare · 37% in Medicare Advantage · 12 Advantage plans with drug coverage
• Pulaski County1,391 with Medicare · 42% in Medicare Advantage · 11 Advantage plans with drug coverage
• Putnam County1,623 with Medicare · 32% in Medicare Advantage · 15 Advantage plans with drug coverage
• Randolph County7,498 with Medicare · 52% in Medicare Advantage · 7 Advantage plans with drug coverage
• Richland County3,863 with Medicare · 28% in Medicare Advantage · 10 Advantage plans with drug coverage
• Rock Island County32,968 with Medicare · 59% in Medicare Advantage · 18 Advantage plans with drug coverage
• Saline County6,170 with Medicare · 37% in Medicare Advantage · 8 Advantage plans with drug coverage
• Sangamon County45,512 with Medicare · 59% in Medicare Advantage · 16 Advantage plans with drug coverage
• Schuyler County1,785 with Medicare · 36% in Medicare Advantage · 11 Advantage plans with drug coverage
• Scott County1,193 with Medicare · 37% in Medicare Advantage · 15 Advantage plans with drug coverage
• Shelby County5,330 with Medicare · 31% in Medicare Advantage · 11 Advantage plans with drug coverage
• St. Clair County54,503 with Medicare · 56% in Medicare Advantage · 34 Advantage plans with drug coverage
• Stark County1,385 with Medicare · 39% in Medicare Advantage · 14 Advantage plans with drug coverage
• Stephenson County12,271 with Medicare · 61% in Medicare Advantage · 19 Advantage plans with drug coverage
• Tazewell County31,200 with Medicare · 45% in Medicare Advantage · 15 Advantage plans with drug coverage
• Union County4,509 with Medicare · 45% in Medicare Advantage · 15 Advantage plans with drug coverage
• Vermilion County17,815 with Medicare · 56% in Medicare Advantage · 13 Advantage plans with drug coverage
• Wabash County2,837 with Medicare · 22% in Medicare Advantage · 10 Advantage plans with drug coverage
• Warren County4,035 with Medicare · 37% in Medicare Advantage · 9 Advantage plans with drug coverage
• Washington County3,469 with Medicare · 31% in Medicare Advantage · 18 Advantage plans with drug coverage
• Wayne County3,925 with Medicare · 25% in Medicare Advantage · 10 Advantage plans with drug coverage
• White County3,697 with Medicare · 29% in Medicare Advantage · 10 Advantage plans with drug coverage
• Whiteside County14,685 with Medicare · 40% in Medicare Advantage · 13 Advantage plans with drug coverage
• Will County125,542 with Medicare · 42% in Medicare Advantage · 39 Advantage plans with drug coverage
• Williamson County16,149 with Medicare · 39% in Medicare Advantage · 4 Advantage plans with drug coverage
• Winnebago County63,833 with Medicare · 59% in Medicare Advantage · 21 Advantage plans with drug coverage
• Woodford County8,437 with Medicare · 37% in Medicare Advantage · 11 Advantage plans with drug coverage

Sources: CMS Medicare Monthly Enrollment, July 2026, and the CMS 2027 plan landscape. Medicare Advantage here includes other Medicare health plans, such as cost plans and PACE. Before you meet any agent, check their Illinois license.

Keep reading

• How to find a good Medicare agent near youWhere to look for a local Medicare agent, how to narrow the list to one or two, and the five-minute checks to do before you share anything.
• Medicare Open Enrollment checklist: what to check before December 7A step-by-step checklist for the October 15 to December 7, 2026 Open Enrollment Period: what to read in your plan's letter, what's changing for 2027, what you can switch, and what happens if you do nothing.
• Moving to another state with Medicare: what changes and what to doOriginal Medicare moves with you; most Medicare Advantage and drug plans don't. What happens to each kind of coverage when you move, your window to switch, and why your agent must be licensed in your new state.