US Counties With the Highest Medicare Advantage Shares

3,127 US counties ranked by Medicare Advantage share, from highest to lowest. First are Monroe County, NY (81.3), Miami-Dade County, FL (79.7) and Starr County, TX (79.5). The middle one of the 3,127 has 45.8.

What this measures

The percentage of people with full Medicare coverage who chose a Medicare Advantage plan. These are private insurance plans that take the place of traditional Medicare. About half of all people on Medicare now have one. Before 2014 it counts anyone in a plan at any time in the year; from 2014, anyone in a plan all year. Source: CMS Medicare Geographic Variation Public Use File.

For most measures, a national ranking mostly sorts places by income and by how urban they are. Each county’s own page compares it with the 50 counties most like it instead, which is often the fairer view.

The 100 highest counties

Rank	County	% of enrollees
1	Monroe County, NY	81.3
2	Miami-Dade County, FL	79.7
3	Starr County, TX	79.5
4	St. John the Baptist Parish, LA	79.3
5	Ottawa County, MI	78.6
6	St. Charles Parish, LA	78.3
7	Hidalgo County, TX	77.9
8	Cambria County, PA	77.7
9	Lowndes County, AL	77.3
10	Armstrong County, PA	77
11	El Paso County, TX	76.9
12	Meeker County, MN	76.6
13	Rockingham County, NC	76.3
14	Willacy County, TX	76.3
15	Ontario County, NY	76.1
16	Newaygo County, MI	76
17	Randolph County, NC	75.7
18	Calumet County, WI	75.5
19	Erie County, NY	75.4
20	Beaver County, PA	75.3
21	Jefferson Parish, LA	75.3
22	Niagara County, NY	75.2
23	Wayne County, NY	75.2
24	McLeod County, MN	75.1
25	Livingston County, NY	75.1
26	Oconto County, WI	75
27	Iberville Parish, LA	74.9
28	Kent County, MI	74.7
29	Outagamie County, WI	74.7
30	Gadsden County, FL	74.7
31	Allegan County, MI	74.6
32	Westmoreland County, PA	74.6
33	Indiana County, PA	74.6
34	Clay County, KY	74.4
35	Osceola County, FL	74.2
36	Bullock County, AL	73.9
37	Yadkin County, NC	73.8
38	Bronx County, NY	73.8
39	Clayton County, GA	73.8
40	Franklin County, MO	73.8
41	Chilton County, AL	73.7
42	Allegheny County, PA	73.7
43	Stokes County, NC	73.6
44	St. Bernard Parish, LA	73.5
45	Cameron County, TX	73.5
46	Muskegon County, MI	73.2
47	Genesee County, NY	73.1
48	Maverick County, TX	73.1
49	Hawkins County, TN	73.1
50	West Baton Rouge Parish, LA	73
51	Davidson County, NC	73
52	Orleans Parish, LA	73
53	Le Sueur County, MN	73
54	Mobile County, AL	73
55	San Bernardino County, CA	72.9
56	Lawrence County, PA	72.9
57	Plaquemines Parish, LA	72.9
58	Stewart County, GA	72.7
59	Orleans County, NY	72.7
60	Clark County, WA	72.6
61	Sibley County, MN	72.6
62	Ascension Parish, LA	72.6
63	Dallas County, AL	72.4
64	Winnebago County, WI	72.3
65	St. Louis County, MN	72.3
66	Burke County, GA	72.2
67	Aitkin County, MN	72.2
68	Rice County, MN	72.2
69	Dickenson County, VA	72.2
70	Washington County, PA	72.2
71	Ionia County, MI	72.2
72	Guilford County, NC	72.2
73	Shawano County, WI	71.9
74	Elliott County, KY	71.9
75	Clinton County, MI	71.9
76	Brown County, WI	71.8
77	Clackamas County, OR	71.8
78	Multnomah County, OR	71.7
79	St. James Parish, LA	71.6
80	Douglas County, MO	71.6
81	Alamance County, NC	71.6
82	Leslie County, KY	71.5
83	Butler County, PA	71.4
84	Goodhue County, MN	71.4
85	Greene County, PA	71.2
86	Warren County, GA	71.1
87	Eaton County, MI	71.1
88	Mille Lacs County, MN	70.9
89	Pine County, MN	70.9
90	Baker County, GA	70.9
91	Jefferson County, AL	70.9
92	Yates County, NY	70.7
93	Livingston Parish, LA	70.7
94	Washington County, OR	70.7
95	Perry County, AL	70.7
96	Turner County, GA	70.7
97	Somerset County, PA	70.7
98	Zavala County, TX	70.7
99	Lee County, VA	70.6
100	Scott County, VA	70.6

Every state, highest first

Each state’s own published figure, not an average of its counties.

Rank	State	% of enrollees
1	Puerto Rico	95.7
2	Rhode Island	63.9
3	Michigan	62.6
4	Minnesota	62.1
5	Alabama	61.7
6	Hawaii	60.9
7	Connecticut	59.7
8	Maine	59.2
9	Wisconsin	58.3
10	Florida	58.2
11	Ohio	57.8
12	Georgia	57.5
13	Oregon	57.5
14	Louisiana	57.4
15	Texas	56.6
16	North Carolina	56.1
17	Pennsylvania	55.6
18	California	55.4
19	Kentucky	55.4
20	Colorado	55.3
21	New York	54.9
22	Missouri	54.7
23	Tennessee	54.6
24	Utah	54.4
25	Nevada	54.3
26	West Virginia	54.1
27	Arizona	53.3
28	New Mexico	52.9
29	Indiana	50.2
30	Idaho	49.5
31	Washington	49.5
32	South Carolina	45.9
33	Arkansas	45.5
34	Illinois	44.2
35	New Jersey	43.3
36	Oklahoma	41.1
37	Mississippi	41.1
38	Virginia	39.5
39	Massachusetts	36.9
40	Iowa	36.8
41	District of Columbia	36.5
42	New Hampshire	36.1
43	South Dakota	35.6
44	Nebraska	34.1
45	Kansas	33.6
46	North Dakota	33.3
47	Vermont	32.7
48	Delaware	31.7
49	Montana	29.3
50	Maryland	24.5
51	Wyoming	13.7
52	Alaska	2.62

More on Medicare Advantage share

A ranking describes places, not the people in them, and a high or low place does not by itself say why. All US rankings.