CMS, read September 2026

People with Medicare in Illinois

What CMS published about people with Medicare in Illinois, taken from CMS Medicare Monthly Enrollment, 2025 and read September 2026.

the agency that filed this
Centers for Medicare & Medicaid Services
of the states read have this measure filed
51/51
the day this file was read
2026-09-11

The figure, as CMS filed it

In 2025, 2,452,877 people were enrolled in Medicare in Illinois.
CMS Medicare Monthly Enrollment, 2025, read September 2026

That count is the whole of what CMS publishes on this point for this state in the file cited. It is reproduced here with the field it came from; nothing on this page is our interpretation of it, and no plan is named or recommended anywhere on this site.

The same measure in other states

State What CMS published
Alabama
In 2025, 1,133,992 people were enrolled in Medicare in Alabama.
CMS Medicare Monthly Enrollment, 2025, read September 2026
Alaska
In 2025, 121,467 people were enrolled in Medicare in Alaska.
CMS Medicare Monthly Enrollment, 2025, read September 2026
Arizona
In 2025, 1,535,475 people were enrolled in Medicare in Arizona.
CMS Medicare Monthly Enrollment, 2025, read September 2026
Arkansas
In 2025, 687,528 people were enrolled in Medicare in Arkansas.
CMS Medicare Monthly Enrollment, 2025, read September 2026
California
In 2025, 7,108,792 people were enrolled in Medicare in California.
CMS Medicare Monthly Enrollment, 2025, read September 2026
Colorado
In 2025, 1,066,219 people were enrolled in Medicare in Colorado.
CMS Medicare Monthly Enrollment, 2025, read September 2026
Connecticut
In 2025, 767,433 people were enrolled in Medicare in Connecticut.
CMS Medicare Monthly Enrollment, 2025, read September 2026
Delaware
In 2025, 253,089 people were enrolled in Medicare in Delaware.
CMS Medicare Monthly Enrollment, 2025, read September 2026
District of Columbia
In 2025, 97,257 people were enrolled in Medicare in District of Columbia.
CMS Medicare Monthly Enrollment, 2025, read September 2026
Florida
In 2025, 5,242,870 people were enrolled in Medicare in Florida.
CMS Medicare Monthly Enrollment, 2025, read September 2026
Georgia
In 2025, 1,994,391 people were enrolled in Medicare in Georgia.
CMS Medicare Monthly Enrollment, 2025, read September 2026
Hawaii
In 2025, 312,517 people were enrolled in Medicare in Hawaii.
CMS Medicare Monthly Enrollment, 2025, read September 2026
Idaho
In 2025, 407,087 people were enrolled in Medicare in Idaho.
CMS Medicare Monthly Enrollment, 2025, read September 2026
Indiana
In 2025, 1,404,690 people were enrolled in Medicare in Indiana.
CMS Medicare Monthly Enrollment, 2025, read September 2026
Iowa
In 2025, 699,242 people were enrolled in Medicare in Iowa.
CMS Medicare Monthly Enrollment, 2025, read September 2026
Kansas
In 2025, 601,285 people were enrolled in Medicare in Kansas.
CMS Medicare Monthly Enrollment, 2025, read September 2026
Kentucky
In 2025, 1,001,470 people were enrolled in Medicare in Kentucky.
CMS Medicare Monthly Enrollment, 2025, read September 2026
Louisiana
In 2025, 955,821 people were enrolled in Medicare in Louisiana.
CMS Medicare Monthly Enrollment, 2025, read September 2026
Maine
In 2025, 385,690 people were enrolled in Medicare in Maine.
CMS Medicare Monthly Enrollment, 2025, read September 2026
Maryland
In 2025, 1,176,384 people were enrolled in Medicare in Maryland.
CMS Medicare Monthly Enrollment, 2025, read September 2026
Massachusetts
In 2025, 1,491,093 people were enrolled in Medicare in Massachusetts.
CMS Medicare Monthly Enrollment, 2025, read September 2026
Michigan
In 2025, 2,293,576 people were enrolled in Medicare in Michigan.
CMS Medicare Monthly Enrollment, 2025, read September 2026
Minnesota
In 2025, 1,183,036 people were enrolled in Medicare in Minnesota.
CMS Medicare Monthly Enrollment, 2025, read September 2026
Mississippi
In 2025, 651,475 people were enrolled in Medicare in Mississippi.
CMS Medicare Monthly Enrollment, 2025, read September 2026
Missouri
In 2025, 1,354,619 people were enrolled in Medicare in Missouri.
CMS Medicare Monthly Enrollment, 2025, read September 2026
Montana
In 2025, 267,875 people were enrolled in Medicare in Montana.
CMS Medicare Monthly Enrollment, 2025, read September 2026
Nebraska
In 2025, 392,477 people were enrolled in Medicare in Nebraska.
CMS Medicare Monthly Enrollment, 2025, read September 2026
Nevada
In 2025, 617,898 people were enrolled in Medicare in Nevada.
CMS Medicare Monthly Enrollment, 2025, read September 2026
New Hampshire
In 2025, 354,126 people were enrolled in Medicare in New Hampshire.
CMS Medicare Monthly Enrollment, 2025, read September 2026
New Jersey
In 2025, 1,809,250 people were enrolled in Medicare in New Jersey.
CMS Medicare Monthly Enrollment, 2025, read September 2026
New Mexico
In 2025, 470,656 people were enrolled in Medicare in New Mexico.
CMS Medicare Monthly Enrollment, 2025, read September 2026
New York
In 2025, 3,994,367 people were enrolled in Medicare in New York.
CMS Medicare Monthly Enrollment, 2025, read September 2026
North Carolina
In 2025, 2,282,725 people were enrolled in Medicare in North Carolina.
CMS Medicare Monthly Enrollment, 2025, read September 2026
North Dakota
In 2025, 151,412 people were enrolled in Medicare in North Dakota.
CMS Medicare Monthly Enrollment, 2025, read September 2026
Ohio
In 2025, 2,581,510 people were enrolled in Medicare in Ohio.
CMS Medicare Monthly Enrollment, 2025, read September 2026
Oklahoma
In 2025, 820,448 people were enrolled in Medicare in Oklahoma.
CMS Medicare Monthly Enrollment, 2025, read September 2026
Oregon
In 2025, 962,060 people were enrolled in Medicare in Oregon.
CMS Medicare Monthly Enrollment, 2025, read September 2026
Pennsylvania
In 2025, 3,000,965 people were enrolled in Medicare in Pennsylvania.
CMS Medicare Monthly Enrollment, 2025, read September 2026
Rhode Island
In 2025, 248,568 people were enrolled in Medicare in Rhode Island.
CMS Medicare Monthly Enrollment, 2025, read September 2026
South Carolina
In 2025, 1,263,550 people were enrolled in Medicare in South Carolina.
CMS Medicare Monthly Enrollment, 2025, read September 2026
South Dakota
In 2025, 202,669 people were enrolled in Medicare in South Dakota.
CMS Medicare Monthly Enrollment, 2025, read September 2026
Tennessee
In 2025, 1,510,306 people were enrolled in Medicare in Tennessee.
CMS Medicare Monthly Enrollment, 2025, read September 2026
Texas
In 2025, 4,914,044 people were enrolled in Medicare in Texas.
CMS Medicare Monthly Enrollment, 2025, read September 2026
Utah
In 2025, 480,007 people were enrolled in Medicare in Utah.
CMS Medicare Monthly Enrollment, 2025, read September 2026
Vermont
In 2025, 168,122 people were enrolled in Medicare in Vermont.
CMS Medicare Monthly Enrollment, 2025, read September 2026
Virginia
In 2025, 1,728,531 people were enrolled in Medicare in Virginia.
CMS Medicare Monthly Enrollment, 2025, read September 2026
Washington
In 2025, 1,558,503 people were enrolled in Medicare in Washington.
CMS Medicare Monthly Enrollment, 2025, read September 2026
West Virginia
In 2025, 456,398 people were enrolled in Medicare in West Virginia.
CMS Medicare Monthly Enrollment, 2025, read September 2026
Wisconsin
In 2025, 1,348,425 people were enrolled in Medicare in Wisconsin.
CMS Medicare Monthly Enrollment, 2025, read September 2026
Wyoming
In 2025, 130,603 people were enrolled in Medicare in Wyoming.
CMS Medicare Monthly Enrollment, 2025, read September 2026

Side by side, each from its own state's row of the same file. Where two states differ, the difference is between two published counts; it is not our reading of either.

Where this comes from

Taken from CMS Medicare Monthly Enrollment, 2025 as it stood on September 2026; the response from that day is stored beside the index, so the figure can be checked against its origin. Across the measures asked here, CMS files 5 for this state and withholds 0.

Cite or embed this figure

CMS on people with Medicare in Illinois: “In 2025, 2,452,877 people were enrolled in Medicare in Illinois.” (Medicare Plan Comparison State Enrollment Index).

Cite as: "Medicare Plan Comparison State Enrollment Index: People with Medicare, Illinois", updated 2026-09-11, https://medicareplancomparison.com/states/illinois/people-with-medicare/.

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