Estimated number of children experiencing food insecurity.
Feeding America, Map the Meal Gap available at: http://feedingamerica.org/hunger-in-america/hunger-studies/map-the-meal-gap.aspx.
Feeding America examined the relationship between food insecurity and indicators of food insecurity and child food insecurity (poverty, unemployment, median income, etc.) at the state level. They then used the coefficient estimates from this analysis plus information on the same variables defined at the county level to generate estimated food insecurity rates for individuals or children at the county level. Information on calculations can be found at: http://feedingamerica.org/hunger-in-america/hunger-studies/map-the-meal-gap/how-we-got-map-data.aspx
UPDATED: August 26, 2017