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CMS Medicare enrollment · April 2026

Illinois Medicare Enrollment

State and county enrollment from CMS, including Original Medicare, Medicare Advantage and Other Health Plans, and Part D coverage.

Informational only. These enrollment counts do not compare plans or provide medical, financial, or enrollment advice.

Total Medicare enrollment
2.5M

2,478,651

Original Medicare
1.4M

1,390,621 beneficiaries

MA & Other share
43.9%

CMS combined delivery-system measure

Part D coverage
82.8%

2,051,994 beneficiaries

County enrollment

103 CMS county rows for Illinois. Unavailable values remain marked as not reported rather than estimated.

CountyTotalOriginal MedicareMA & OtherMA & Other sharePart D share
Adams County15,8239,8685,95537.6%84.2%
Alexander County1,49377372048.2%81.1%
Bond County3,8632,0281,83547.5%87.5%
Boone County11,0255,2305,79552.6%84.5%
Brown County1,13873440435.5%85.4%
Bureau County8,7555,9412,81432.1%85.5%
Calhoun County1,26877549338.9%86.4%
Carroll County4,4872,6781,80940.3%84.6%
Cass County2,7171,6001,11741.1%84.6%
Champaign County33,26713,69019,57758.8%85.1%
Christian County8,2974,3523,94547.5%82.1%
Clark County3,9502,2381,71243.3%85.4%
Clay County3,3402,50783324.9%83.2%
Clinton County8,4314,9993,43240.7%81.3%
Coles County10,5995,5835,01647.3%87.3%
Cook County886,637489,039397,59844.8%82.6%
Crawford County4,5773,4091,16825.5%85.3%
Cumberland County2,6061,4901,11642.8%85.6%
De Witt County3,8722,2641,60841.5%84%
Dekalb County19,04211,0817,96141.8%83.2%
Douglas County4,3452,1522,19350.5%84.9%
Dupage County186,207115,58170,62637.9%82%
Edgar County4,4632,8921,57135.2%84.4%
Edwards County1,5681,23233621.4%82.4%
Effingham County8,5346,2302,30427%85.1%
Fayette County4,5742,8781,69637.1%84.2%
Ford County3,3372,1501,18735.6%83.4%
Franklin County9,7775,7374,04041.3%74.6%
Fulton County8,4374,4533,98447.2%80.5%
Gallatin County1,34989145834%77.9%
Greene County3,0771,9071,17038%85.1%
Grundy County10,1716,5533,61835.6%80.5%
Hamilton County1,9831,37261130.8%81.3%
Hancock County4,9143,6021,31226.7%83.3%
Hardin County1,02069332732.1%81.3%
Henderson County1,7701,16460634.2%84.5%
Henry County12,3436,3785,96548.3%85.2%
Iroquois County7,2864,8972,38932.8%84.6%
Jackson County11,0915,5075,58450.3%82.1%
Jasper County2,3731,68069329.2%86.8%
Jefferson County8,7925,9562,83632.3%80.8%
Jersey County5,8483,1142,73446.8%86.6%
Jo Daviess County6,9402,9104,03058.1%84.4%
Johnson County3,2071,8501,35742.3%81.2%
Kane County93,98856,00637,98240.4%82.6%
Kankakee County23,50914,2349,27539.5%84%
Kendall County19,36511,4387,92740.9%80.4%
Knox County12,6346,8115,82346.1%86%
Lake County135,56689,02446,54234.3%81.1%
Lasalle County26,55817,0879,47135.7%82.4%
Lawrence County3,3172,44187626.4%82.7%
Lee County8,6185,1223,49640.6%84.1%
Livingston County8,4104,9743,43640.9%86.9%
Logan County6,2813,3512,93046.6%86.4%
Macon County24,46815,3209,14837.4%83%
Macoupin County11,9446,7165,22843.8%84.6%
Madison County59,73026,62233,10855.4%85.7%
Marion County10,0006,8073,19331.9%82.4%
Marshall County3,2922,0211,27138.6%81.4%
Mason County3,5962,0971,49941.7%79.6%
Massac County3,7082,5811,12730.4%78.3%
Mcdonough County6,0513,2322,81946.6%84.4%
Mchenry County67,00342,53224,47136.5%81.5%
Mclean County30,74417,13413,61044.3%86.8%
Menard County3,0471,3851,66254.5%85.7%
Mercer County4,0492,0941,95548.3%85.6%
Monroe County8,6333,9544,67954.2%85.9%
Montgomery County7,1574,2692,88840.4%85.5%
Morgan County8,1124,5773,53543.6%86.1%
Moultrie County3,2342,1181,11634.5%84%
Ogle County12,0576,2465,81148.2%85.4%
Peoria County38,15118,73119,42050.9%83.5%
Perry County4,7542,6392,11544.5%71.5%
Piatt County4,1471,8692,27854.9%85.9%
Pike County3,8242,6271,19731.3%84.8%
Pope County1,16774042736.6%78.1%
Pulaski County1,39881858041.5%80.8%
Putnam County1,6081,09651231.8%82.2%
Randolph County7,4673,6243,84351.5%81.7%
Richland County3,8502,7621,08828.3%85.1%
Rock Island County32,89513,48019,41559%85.5%
Saline County6,1693,9082,26136.7%78.4%
Sangamon County45,27018,55126,71959%86.3%
Schuyler County1,7861,15163535.6%82.2%
Scott County1,18574444137.2%83.5%
Shelby County5,3393,6791,66031.1%83%
St. Clair County54,17923,85430,32556%77.5%
Stark County1,37783953839.1%80.1%
Stephenson County12,2454,6977,54861.6%87.6%
Tazewell County31,09816,98514,11345.4%81.2%
Union County4,5172,5191,99844.2%84.1%
UnknownNot reportedNot reportedNot reportedNot reportedNot reported
Vermilion County17,8117,8309,98156%84%
Wabash County2,8322,21162121.9%80.4%
Warren County4,0162,5431,47336.7%86.1%
Washington County3,4482,3641,08431.4%81.7%
Wayne County3,9382,98695224.2%83.2%
White County3,6802,6281,05228.6%83.2%
Whiteside County14,6628,7535,90940.3%85.3%
Will County124,16972,29951,87041.8%81%
Williamson County16,1149,9366,17838.3%77.5%
Winnebago County63,50626,21637,29058.7%85.7%
Woodford County8,3845,2913,09336.9%82.5%

Source and interpretation

CMS Medicare Monthly Enrollment, April 2026, published 2026-07-23. “MA & Other” retains the official combined CMS field label.

  • CMS suppresses some small counts with an asterisk; suppressed values remain null in this snapshot.
  • Medicare Advantage and Other Health Plans is the CMS-published combined measure and is not limited to Medicare Advantage alone.
  • Enrollment counts describe a reporting month and do not compare plan benefits, provider networks, quality, or personal costs.

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