CMS Marketplace · plan year 2025→2026

Premium Change Rankings

Year-over-year change in listed ACA marketplace premiums across 2,055 counties. Same yoy_change field as each county page.

Data updated 2026-08-30

+53.9%
Largest rise · Clark, IN
-4.2%
Largest decline · Aleutians East, AK
2,055
Counties with both years

Clark County, IN posted the largest listed-premium increase in the 2,055-county CMS panel from plan year 2025 to 2026: +53.9%. The #50 cutoff on this rising board is +43.6%.

PY 2025→2026 listed-premium change

Clark County, IN leads this board at +53.9% (tied with 6 other IN counties on the same rating-area filing). The 50th-place cutoff to appear on the rising list is +43.6%; Aleutians East County, AK sits at the other end at -4.2% (tied).

+53.9%
#1 rise · Clark, IN
+43.6%
#50 cutoff, rising board
-4.2%
Largest decline · Aleutians East, AK
2055
Counties with a prior-year pair

Listed (age-27) premiums before Advance Premium Tax Credits. A rising listed premium can still mean a lower net premium for subsidized enrollees when the benchmark used for subsidies also rises. Not insurance advice.

Largest listed-premium increases

Top 12 of 50 counties on the rising board. Sort key is counties.yoy_change, plan year 2026 versus 2025.

Largest YoY listed-premium increases, PY 2026

1. Clark, IN+53.9%2. Crawford, IN+53.9%3. Floyd, IN+53.9%4. Harrison, IN+53.9%5. Jefferson, IN+53.9%6. Scott, IN+53.9%7. Washington, IN+53.9%8. Adams, MS+48.9%9. Amite, MS+48.9%10. Grenada, MS+48.9%11. Noxubee, MS+48.9%12. Oktibbeha, MS+48.9%
Source: CMS Marketplace Public Use Files, plan years 2025–2026. Same yoy_change as county pages.

50 steepest increases

# County YoY Silver avg
1 Clark, IN +53.9% $441
2 Crawford, IN +53.9% $441
3 Floyd, IN +53.9% $441
4 Harrison, IN +53.9% $441
5 Jefferson, IN +53.9% $441
6 Scott, IN +53.9% $441
7 Washington, IN +53.9% $441
8 Adams, MS +48.9% $602
9 Amite, MS +48.9% $602
10 Grenada, MS +48.9% $602
11 Noxubee, MS +48.9% $602
12 Oktibbeha, MS +48.9% $602
13 Wilkinson, MS +48.9% $602
14 Yazoo, MS +48.9% $602
15 Attala, MS +45.5% $637
16 Bolivar, MS +45.5% $637
17 Carroll, MS +45.5% $637
18 Choctaw, MS +45.5% $637
19 Claiborne, MS +45.5% $637
20 Clarke, MS +45.5% $637
21 Coahoma, MS +45.5% $637
22 Franklin, MS +45.5% $637
23 Holmes, MS +45.5% $637
24 Humphreys, MS +45.5% $637
25 Issaquena, MS +45.5% $637
26 Jasper, MS +45.5% $637
27 Jefferson, MS +45.5% $637
28 Kemper, MS +45.5% $637
29 Lauderdale, MS +45.5% $637
30 Leake, MS +45.5% $637
31 Leflore, MS +45.5% $637
32 Lincoln, MS +45.5% $637
33 Montgomery, MS +45.5% $637
34 Neshoba, MS +45.5% $637
35 Newton, MS +45.5% $637
36 Pike, MS +45.5% $637
37 Quitman, MS +45.5% $637
38 Scott, MS +45.5% $637
39 Sharkey, MS +45.5% $637
40 Smith, MS +45.5% $637
41 Sunflower, MS +45.5% $637
42 Tallahatchie, MS +45.5% $637
43 Washington, MS +45.5% $637
44 Wayne, MS +45.5% $637
45 Winston, MS +45.5% $637
46 Yalobusha, MS +45.5% $637
47 Knox, OH +45.1% $617
48 Monroe, FL +43.8% $1,318
49 Copiah, MS +43.6% $650
50 Simpson, MS +43.6% $650

50 smallest increases / declines

# County YoY Silver avg
1 Aleutians East, AK -4.2% $857
2 Aleutians West, AK -4.2% $857
3 Bethel, AK -4.2% $849
4 Bristol Bay, AK -4.2% $857
5 Chugach, AK -4.2% $849
6 Copper River, AK -4.2% $849
7 Denali, AK -4.2% $857
8 Dillingham, AK -4.2% $849
9 Kodiak Island, AK -4.2% $857
10 Kusilvak, AK -4.2% $857
11 Lake And Peninsula, AK -4.2% $857
12 Nome, AK -4.2% $857
13 North Slope, AK -4.2% $857
14 Northwest Arctic, AK -4.2% $857
15 Southeast Fairbanks, AK -4.2% $857
16 Yakutat, AK -4.2% $857
17 Yukon Koyukuk, AK -4.2% $857
18 Calumet, WI -3.1% $456
19 Anchorage, AK -1.8% $846
20 Fairbanks North Star, AK -1.8% $871
21 Kenai Peninsula, AK -1.8% $871
22 Matanuska Susitna, AK -1.8% $871
23 Haines, AK -1.7% $839
24 Hoonah Angoon, AK -1.7% $839
25 Juneau, AK -1.7% $839
26 Ketchikan Gateway, AK -1.7% $839
27 Petersburg, AK -1.7% $839
28 Prince Of Wales Hyder, AK -1.7% $839
29 Sitka, AK -1.7% $839
30 Skagway, AK -1.7% $839
31 Wrangell, AK -1.7% $839
32 Outagamie, WI +0.2% $463
33 Winnebago, WI +0.2% $463
34 Morton, ND +1.9% $469
35 Clay, SD +2.4% $539
36 Turner, SD +2.4% $539
37 Union, SD +2.4% $539
38 Durham, NC +2.8% $600
39 Lee, NC +2.8% $600
40 McCook, SD +3.4% $529
41 Bennett, SD +3.9% $678
42 Butte, SD +3.9% $678
43 Custer, SD +3.9% $678
44 Fall River, SD +3.9% $678
45 Haakon, SD +3.9% $678
46 Harding, SD +3.9% $678
47 Jackson, SD +3.9% $678
48 Jones, SD +3.9% $678
49 Lawrence, SD +3.9% $678
50 Meade, SD +3.9% $678

Several neighboring counties share one CMS rating-area filing, so identical YoY figures are expected, not a copy error. National trend notes live on Silver premium trends 2022–2026 and premium-trends. Source: CMS Marketplace Public Use Files.

PlainHealthPlan is rendered directly from CMS Marketplace Public Use Files., no number is typed in by an editor. County YoY percentages are the same counties.yoy_change values rendered on each county page, computed from consecutive CMS Marketplace plan-year extracts. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Plan year 2026.