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Montana counties

Medicare Advantage and marketplace plans are set by area, so start with your county. 56 listed.

CountyPopulation (2023 est.)Rank in MontanaMedicare plans leaving (2027)
Beaverhead County9,885225
Big Horn County12,751169
Blaine County6,899313
Broadwater County8,032285
Carbon County11,419195
Carter County1,418503
Cascade County84,90059
Chouteau County5,8473410
Custer County11,985179
Daniels County1,633493
Dawson County8,810263
Deer Lodge County9,673235
Fallon County2,994423
Fergus County11,772189
Flathead County113,679413
Gallatin County126,40925
Garfield County1,211513
Glacier County13,6091413
Golden Valley County8355413
Granite County3,595405
Hill County16,276129
Jefferson County13,048155
Judith Basin County2,093439
Lake County33,338912
Lewis and Clark County75,01165
Liberty County1,974469
Lincoln County21,895105
Madison County9,521245
McCone County1,676487
Meagher County2,071449
Mineral County5,090379
Missoula County121,84935
Musselshell County5,308359
Park County17,903116
Petroleum County554563
Phillips County4,249383
Pondera County6,125339
Powder River County1,743473
Powell County7,133305
Prairie County1,112523
Ravalli County47,73879
Richland County11,173203
Roosevelt County10,319213
Rosebud County8,160279
Sanders County13,684139
Sheridan County3,498413
Silver Bow County36,36085
Stillwater County9,173256
Sweet Grass County3,763399
Teton County6,430329
Toole County5,133369
Treasure County772553
Valley County7,474293
Wheatland County2,057459
Wibaux County910533
Yellowstone County170,843115

Population: U.S. Census Bureau Population Estimates, 2023.

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Reviewed by Richard Lander, licensed insurance agent (NPN 21255551), Lander LLC. Last updated October 3, 2026. This page is educational and is not a quote, an offer of coverage, or legal or tax advice.

Do it yourself

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Medicare

Medicare Open Enrollment starts October 15th

Take a look at Montana plans, or go ahead and enroll yourself. Call if you need any help with your application.

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Under 65 · ACA

ACA Open Enrollment opens November 1st

Take a look at Montana plans, or go ahead and enroll yourself when it opens. Call if you need any help with your application.

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Questions along the way? Call 855-367-1095 for assistance.