Share American Indian or Alaska Native, not Hispanic and Medicare enrollees also on Medicaid
Where Share American Indian or Alaska Native, not Hispanic is higher, Medicare enrollees also on Medicaid tends to be higher. The link is weak: +0.38 across 1,304 counties, on a scale from −1 (opposite) to +1 (in step). That figure compares places with the same population density, income and education, so those differences can't explain it. It holds inside states too. Measured separately within each of 29 states, the middle value of the link is +0.09.
Holds after adjusting
Every place, plotted
One dot for each place reporting both measures. Hover over or tap a dot to see its name and values. The thin line is the straight line that best fits the dots. The bold line, shown for counties, is the link after adjusting for density, income and education. A dot far from the lines is a place that does not follow the pattern.
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What each measure is
Share American Indian or Alaska Native, not Hispanic
The percentage of residents who are American Indian or Alaska Native alone and not Hispanic. They live mostly on and near reservations: Oglala Lakota County, South Dakota is 91%, while most counties are under 1%.
Census ACS 5-year · ACS table B03002_005, divided by total population
Medicare enrollees also on Medicaid
The percentage of people in traditional Medicare who could also get Medicaid for at least one month of the year. Medicaid is the health program for people with low incomes, so this picks out older and disabled people who are also poor. People on both are often called dual eligible.
CMS Medicare Geographic Variation Public Use File · CMS Medicare Geographic Variation PUF, national/state/county, all ages, BENE_DUAL_PCT
Highest and lowest
Where each measure is highest and lowest among the places reporting both (2023), with the other measure beside it. This is shown for every size of place where both are published. Metro-area values are added up from their counties. A measure that cannot be added up across counties, such as a middle value (median), has no metro figure. Counts are shown per 1,000 residents, since raw totals would only list the largest places. Cities and towns and ZIP codes are shown where the Census survey or the CDC publishes them; most other sources stop at the county. They are shown for places of 5,000 residents or more, and only where the survey’s margin of error is small enough for the figure to be usable. The CDC publishes its health estimates for cities in a version adjusted for age, so places with older or younger people can be compared fairly, but not for ZIP codes.
Counties
By share American Indian or Alaska Native, not Hispanic
| Share American Indian or Alaska Native, not Hispanic | Medicare enrollees also on Medicaid | |
|---|---|---|
| Highest | ||
| Oglala Lakota County, SD | 91.4% | 52 |
| Kusilvak Census Area, AK | 86.4% | 70.2 |
| Sioux County, ND | 83.7% | 37.9 |
| Bethel Census Area, AK | 83.6% | 63.4 |
| Todd County, SD | 83.1% | 50.7 |
| Lowest | ||
| Washington County, CO | 0% | 15.3 |
| Phillips County, CO | 0% | 21.2 |
| Ouray County, CO | 0% | 5.22 |
| Sierra County, CA | 0% | 23.4 |
| Monroe County, AR | 0% | 22.8 |
By Medicare enrollees also on Medicaid
| Share American Indian or Alaska Native, not Hispanic | Medicare enrollees also on Medicaid | |
|---|---|---|
| Highest | ||
| Kusilvak Census Area, AK | 86.4% | 70.2 |
| Bethel Census Area, AK | 83.6% | 63.4 |
| Starr County, TX | 0% | 58 |
| Imperial County, CA | 0.668% | 57.6 |
| Northwest Arctic Borough, AK | 80.1% | 57.4 |
| Lowest | ||
| Loving County, TX | 0% | 0 |
| Sumter County, FL | 0.237% | 2.76 |
| York County, VA | 0.174% | 3.36 |
| Los Alamos County, NM | 0.743% | 3.73 |
| Sully County, SD | 0% | 4.09 |
States
By share American Indian or Alaska Native, not Hispanic
| Share American Indian or Alaska Native, not Hispanic | Medicare enrollees also on Medicaid | |
|---|---|---|
| Highest | ||
| Alaska | 13.5% | 21.9 |
| New Mexico | 8.6% | 18.2 |
| South Dakota | 7.38% | 12.2 |
| Oklahoma | 6.79% | 13.3 |
| Montana | 5.5% | 13 |
| Lowest | ||
| Pennsylvania | 0.0553% | 13.3 |
| Ohio | 0.0625% | 12.5 |
| West Virginia | 0.0647% | 20 |
| Illinois | 0.0697% | 15.2 |
| Indiana | 0.0703% | 15.7 |
By Medicare enrollees also on Medicaid
| Share American Indian or Alaska Native, not Hispanic | Medicare enrollees also on Medicaid | |
|---|---|---|
| Highest | ||
| District of Columbia | 0.106% | 37.1 |
| California | 0.274% | 30.6 |
| Maine | 0.382% | 26.6 |
| Connecticut | 0.0899% | 24.9 |
| Massachusetts | 0.0835% | 23.2 |
| Lowest | ||
| South Carolina | 0.18% | 6.69 |
| Arizona | 3.4% | 8.37 |
| Virginia | 0.121% | 8.72 |
| Utah | 0.683% | 8.76 |
| Hawaii | 0.121% | 9.47 |
Metro areas
By share American Indian or Alaska Native, not Hispanic
| Share American Indian or Alaska Native, not Hispanic | Medicare enrollees also on Medicaid | |
|---|---|---|
| Highest | ||
| Gallup, NM | 75.1% | 39.4 |
| Show Low, AZ | 41.9% | 25.7 |
| Lumberton, NC | 39.1% | 26.7 |
| Farmington, NM | 38.5% | 22.8 |
| Tahlequah, OK | 31.8% | 16.4 |
| Lowest | ||
| Zapata, TX | 0% | 45.2 |
| Weirton-Steubenville, WV-OH | 0% | 15.1 |
| Valdosta, GA | 0% | 15.9 |
| Sikeston, MO | 0% | 18.4 |
| Roanoke, VA | 0% | 8.56 |
By Medicare enrollees also on Medicaid
| Share American Indian or Alaska Native, not Hispanic | Medicare enrollees also on Medicaid | |
|---|---|---|
| Highest | ||
| Rio Grande City-Roma, TX | 0% | 58 |
| El Centro, CA | 0.668% | 57.6 |
| Eagle Pass, TX | 1.37% | 45.5 |
| Zapata, TX | 0% | 45.2 |
| Frankfort, KY | 0% | 40.6 |
| Lowest | ||
| Wildwood-The Villages, FL | 0.237% | 2.76 |
| Los Alamos, NM | 0.743% | 3.73 |
| Naples-Marco Island, FL | 0.0714% | 4.23 |
| Myrtle Beach-Conway-North Myrtle Beach, SC | 0.122% | 4.79 |
| St. George, UT | 0.665% | 4.96 |
Cities and towns — Medicare enrollees also on Medicaid is not published for cities and towns
By share American Indian or Alaska Native, not Hispanic
| Share American Indian or Alaska Native, not Hispanic | Medicare enrollees also on Medicaid | |
|---|---|---|
| Highest | ||
| Zuni Pueblo CDP, NM | 98% | — |
| Kayenta CDP, AZ | 94.4% | — |
| Shiprock CDP, NM | 93.2% | — |
| Tuba City CDP, AZ | 88.7% | — |
| Bethel city, AK | 67.8% | — |
| Lowest | ||
| Windsor Locks CDP, CT | 0% | — |
| Willimantic CDP, CT | 0% | — |
| Wethersfield CDP, CT | 0% | — |
| Trumbull Center CDP, CT | 0% | — |
| Terryville CDP, CT | 0% | — |
ZIP codes — Medicare enrollees also on Medicaid is not published for ZIP codes
By share American Indian or Alaska Native, not Hispanic
| Share American Indian or Alaska Native, not Hispanic | Medicare enrollees also on Medicaid | |
|---|---|---|
| Highest | ||
| ZIP 58316 (Rolette County, ND) | 96.5% | — |
| ZIP 86033 (Navajo County, AZ) | 95.7% | — |
| ZIP 86505 (Apache County, AZ) | 95.6% | — |
| ZIP 87327 (McKinley County, NM) | 95.3% | — |
| ZIP 87313 (McKinley County, NM) | 95% | — |
| Lowest | ||
| ZIP 08904 (Highland Park borough, NJ) | 0% | — |
| ZIP 08901 (New Brunswick city, NJ) | 0% | — |
| ZIP 08889 (Hunterdon County, NJ) | 0% | — |
| ZIP 08882 (South River borough, NJ) | 0% | — |
| ZIP 08867 (Hunterdon County, NJ) | 0% | — |
Counties furthest from the pattern
Compared with the straight line that best fits all 1,315 counties: the five with far more Medicare enrollees also on Medicaid than their share American Indian or Alaska Native, not Hispanic would suggest, and the five with far less.
| Share American Indian or Alaska Native, not Hispanic | Medicare enrollees also on Medicaid | |
|---|---|---|
| Above the line | ||
| Starr County, TX | 0% | 58 |
| Imperial County, CA | 0.668% | 57.6 |
| San Francisco County, CA | 0.202% | 50.5 |
| Zapata County, TX | 0% | 45.2 |
| Maverick County, TX | 1.37% | 45.5 |
| Below the line | ||
| Thurston County, NE | 54.8% | 15.5 |
| Loving County, TX | 0% | 0 |
| Mountrail County, ND | 28.4% | 8.45 |
| Jackson County, SD | 62.3% | 20.1 |
| Big Horn County, MT | 65.3% | 21.6 |
Two series, one county
Both measures over time for a county you pick. The two charts are stacked, so they share only the years along the bottom. You can pick from the thirty largest counties reporting both. This panel covers 2010–2024, and a measure published only once shows as a single dot.
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Every version of the link
Each row measures the same link, from −1 to +1, in a different way. If the rows mostly agree, the link does not depend on one choice of method.
| Before adjusting for anything | +0.376 | 1,304 counties reporting both |
| After adjusting for density, income and education | +0.379 | the part of the link that is not just how urban, rich and educated a place is |
| Also adjusting for population size | +0.361 | size taken out as well as density |
| Also comparing only within each state | +0.426 | each county is compared only with others in its own state, so this is no longer a comparison between states |
| Giving bigger counties more weight | +0.133 | the adjusted link for the average resident rather than the average county. With this weighting, the data counts for about 185 equally weighted counties |
| Middle value inside single states | +0.092 | the link worked out inside each of 29 states with at least 20 counties reporting |
| Using ranks, after adjusting | +0.165 | uses each county’s rank, not its value, so a few extreme counties cannot create the link |
How much to believe it
Could it be chance?
The p-value is the chance of seeing a link this strong if there were really none. A value of 0.05 or less means the link is unlikely to be chance. Very small values are written in short form: 3.1e-16 means 0.00000000000000031, and the bigger the number after “e-”, the smaller the value. Treating every county as a separate case gives p = 1.1e-45. But counties in the same state tend to resemble each other, so the better figure allows for that: p = 1.9e-5. The site tested 29,403 pairs, and testing so many turns up some flukes. The q-value allows for that too. For this pair it is 6.5e-45.
Do nearby places look alike?
Moran’s I measures how much nearby places look alike: 0 means no map pattern, and higher means neighbours are more similar. For the part of each county that the adjustment leaves unexplained, it is +0.55 (p = 0.001). That unexplained part still clusters on the map. So some regional factor shared by both measures is not accounted for.
Did they change together?
The figures above compare counties at one moment. This asks a different question: where share American Indian or Alaska Native, not Hispanic rose most, did Medicare enrollees also on Medicaidmove too? Each county’s change is compared with the average change in its own state. That takes out ups and downs that hit a whole region at once. Each change is the gap between two estimates that both contain some error. That error pulls these links towards zero, so a weak one is weak partly for that reason. The q column shows whether a link could be a fluke, allowing for the many pairs tested: 0.05 or less means it is unlikely to be chance.
| Period | Counties | Change together | Within states | q |
|---|---|---|---|---|
| 2014–2019 the main test: each Census survey figure averages five years, and these two do not overlap; before the pandemic | 1,190 | +0.06 | +0.03 | 0.803 |
| 2019–2023 a repeat check: its two five-year survey figures both include 2019, and it covers the COVID years | 1,058 | -0.12 | +0.03 | 0.567 |
Over the main period, any link between the changes could easily be chance. How change is measured.
Related pairs
- Share American Indian or Alaska Native, not Hispanic and Years of potential life lost — +0.70
- Share American Indian or Alaska Native, not Hispanic and Premature mortality — +0.63
- Share American Indian or Alaska Native, not Hispanic and Life expectancy — -0.58
- Received food stamps and Medicare enrollees also on Medicaid — +0.53
- Medicare enrollees also on Medicaid and Poverty rate (model-based) — +0.49
- Lack of reliable transportation and Medicare enrollees also on Medicaid — +0.49
- Share American Indian or Alaska Native, not Hispanic and Injury deaths — +0.48
- Share American Indian or Alaska Native, not Hispanic and Suicide rate — +0.48
Association only. Nothing here shows that either measure changes the other. This describes counties, not the people in them. Two measures going together across places does not mean the same people have both. How the US county data works · Explore Share American Indian or Alaska Native, not Hispanic and Medicare enrollees also on Medicaid