This data summary provides results from the 2013 and 2014 Small Area Health Insurance Estimates (SAHIE) program at the U.S. Census Bureau. Taken together, the 2013 and 2014 estimates illustrate the geographic concentration of the uninsured across U.S. counties before and after the full implementation of the Affordable Care Act (ACA). 

This document (1) includes tabular information on the 100 counties with the highest estimated numbers of uninsured in 2013 and in 2014, and (2) introduces an interactive map that illustrates the changes in uninsured from 2013 to 2014 for all counties.

The information provided in this data summary can inform efforts to design targeted outreach and enrollment initiatives aimed at the remaining uninsured.

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