Population loss counties are those where the number of county residents declined between the 1990 and 2000 censuses and also between the 2000 and 2010 censuses.

Retirement destination counties are those where the number of residents age 60 and older grew by 15% or more between the 2000 and 2010 censuses due to net migration.

Persistent poverty counties are those where 20% or more of county residents were poor, measured by the 1980, 1990, and 2000 censuses, and the 2007-11 American Community Survey.

Farming dependent counties are those where 25% or more of the county’s average annual labor and proprietors’ earning were derived from farming, or 16% or more of jobs were in farming, as measured by 2010-12 Bureau of Economic Analysis, Local Area Personal Income and Employment data.

Persistent child poverty counties are those where 20% or more of county related children under 18 were poor, measured in the 1980, 1990, 2000 censuses, and the 2007-11 American Community Survey.

Mining dependent counties are those where 13% or more of the county’s average annual labor and proprietors’ earning were derived from mining, or 8% or more of jobs were in mining, as measured by 2010-12 Bureau of Economic Analysis, Local Area Personal Income and Employment data.