From page 62 of An Illustrated Guide to Income in the United States. Looking at the demographics of households with less than $30,000 a year in income, it looks like a number of these households are headed by retired people.
- 33% of these households are headed by someone over 65 year or over compared to the national avg of 21%
- 60% of the time the householder (i.e. person who owned, rented, or maintained the housing unit) did not work for pay in 2010
- 47% are "Owner Occupied" i.e. the person who owns the home lives there.
- 54% Are either living alone or living with a someone they are not related to.
Also households with incomes below $30,000 are more likely to be located in rural and urban areas than the national average.
Looking at the the poverty rate by county there are concentrations of very low income households (under $23,000 for a family of four) in places like Mississippi, Texas, and South Dakota.
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Graphics made in OmniGraphSketcher and Adobe Illustrator using MA Publisher for the map.