The 10 lowest counties in the country, by this ranking, include a cluster of six in the Appalachian Mountains of eastern Kentucky (Breathitt, Clay, Jackson, Lee, Leslie and Magoffin), along with four others in various parts of the rural South: Humphreys County, Miss.; East Carroll Parish, La.; Jefferson County, Ga.; and Lee County, Ark.
Below is a static map from their webpage which shows every county in the US and whether they are doing better or doing worse than the national average.
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And for the record, here are the results for Herkimer and Oneida Counties.