Patient Advocacy Without the Call Center
The data layer behind our Missouri guide and all 65 city pages, in one place: CMS enrollment, Census demographics, and federal shortage designations, county by county.
Coverage data 2024. Plan networks change - we confirm exactly what your plan covers before any work begins.
The 38 of Missouri's 114 counties and the City of St. Louis that our city pages cover, with 1,058,528 beneficiaries. Each county links to its anchor city page.
| County or city | Medicare beneficiaries | Medicare Advantage share | Dual-eligible | Residents 65+ | Shortage designations |
|---|---|---|---|---|---|
| St. Louis County | 225,818 | 56.7% | 24,343 | 186,150 | 5 |
| Jackson County | 135,099 | 55.9% | 20,499 | 111,391 | 9 |
| St. Charles County | 85,371 | 60% | 5,551 | 67,389 | 1 |
| Greene County | 64,300 | 60.9% | 9,358 | 50,744 | 5 |
| Jefferson County | 48,983 | 66.7% | 4,874 | 36,770 | 2 |
| City of St. Louis | 48,215 | 64.3% | 13,967 | 43,622 | 5 |
| Clay County | 48,119 | 48% | 4,298 | 38,061 | 0 |
| Boone County | 31,952 | 48.5% | 3,984 | 24,330 | 1 |
| Franklin County | 27,160 | 72.2% | 2,901 | 19,517 | 2 |
| Jasper County | 26,888 | 49.7% | 4,865 | 19,570 | 4 |
| Cass County | 23,944 | 53.7% | 2,026 | 19,108 | 0 |
| Platte County | 20,315 | 43.7% | 1,245 | 17,091 | 0 |
| Christian County | 19,862 | 59.9% | 2,013 | 14,875 | 2 |
| Buchanan County | 18,822 | 36.2% | 3,087 | 14,335 | 3 |
| Cape Girardeau County | 17,839 | 33.3% | 2,374 | 14,172 | 5 |
| Cole County | 17,114 | 56% | 1,857 | 13,493 | 3 |
| St. Francois County | 16,385 | 56.2% | 3,448 | 11,304 | 3 |
| Taney County | 16,074 | 60.7% | 2,248 | 12,577 | 6 |
| Camden County | 14,278 | 47.8% | 1,235 | 12,556 | 6 |
| Newton County | 12,496 | 46.4% | 1,758 | 11,101 | 5 |
| Howell County | 11,211 | 53% | 2,597 | 7,977 | 8 |
| Butler County | 10,866 | 37.3% | 2,641 | 8,123 | 3 |
| Callaway County | 10,085 | 53.7% | 1,417 | 7,733 | 1 |
| Phelps County | 9,811 | 47.9% | 1,668 | 7,551 | 6 |
| Scott County | 9,598 | 40.9% | 2,154 | 6,995 | 11 |
| Johnson County | 9,472 | 43.9% | 1,084 | 7,013 | 1 |
| Barry County | 9,341 | 59.5% | 1,463 | 7,616 | 5 |
| Pettis County | 9,229 | 45.9% | 1,703 | 7,407 | 4 |
| Laclede County | 9,020 | 67.8% | 1,663 | 6,510 | 4 |
| Polk County | 7,815 | 63.6% | 1,323 | 5,815 | 8 |
| Marion County | 7,047 | 34.5% | 1,284 | 5,320 | 3 |
| Dunklin County | 6,823 | 44.4% | 2,126 | 5,138 | 6 |
| Audrain County | 5,806 | 40.9% | 897 | 4,583 | 4 |
| Randolph County | 5,652 | 41.2% | 1,022 | 4,197 | 1 |
| Adair County | 5,060 | 27% | 899 | 3,823 | 4 |
| Vernon County | 4,708 | 50.1% | 879 | 4,021 | 3 |
| Nodaway County | 4,370 | 19.8% | 559 | 3,632 | 1 |
| Livingston County | 3,580 | 29.9% | 561 | 2,858 | 3 |
Statewide, 53.8% of beneficiaries chose Medicare Advantage in 2025. Counties above that line see more prior authorizations and more denials worth appealing; counties below it lean on Medigap, where Missouri adds a yearly anniversary rule: a Medigap policyholder who drops their policy within 30 days of its anniversary date can buy the same plan letter from any insurer without health questions. People under 65 on Medicare through disability also get a six-month Medigap open enrollment when they enroll in Part B. About 10% of Missouri seniors live below the poverty line, the group most likely to qualify for unclaimed help: Extra Help, Missouri's Medicare Savings Programs, which the Family Support Division decides with an income and resource test, and MORx, the state pharmacy assistance program that pays half of Part D out-of-pocket drug costs for people with Medicare and MO HealthNet. For the full rundown, sources included, see our Missouri patient advocacy hub.
One dedicated advocate for the bills, appeals, appointments, and paperwork, serving all 114 Missouri counties and the City of St. Louis virtually, usually at $0 with Medicare.
Or start from your city: every Missouri city we serve.
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Read moreSources: CMS Medicare Monthly Enrollment (2025); US Census Bureau ACS 2023 5-year; CMS Care Compare Timely & Effective Care (median ER minutes, period ending 09/30/2025); HRSA Health Professional Shortage Area designation file. Data retrieved 2026-10-02. Understood Care is an independent private advocacy service, not a government agency.