The maps show the distribution of the uninsured in a state by combining Census “Public-Use Microdata Areas” (PUMAs) and data from the Centers for Medicare and Medicaid Services (CMS). All maps are interactive and clicking on any PUMA in a state displays more information on the number of uninsured and the distribution of the uninsured by income (based on the federal poverty level) and race/ethnicity.
What are “Public-Use Microdata Areas” (PUMAs)?
Each PUMA is an area within a state that contains at least 100,000 residents. In densely populated areas, PUMAs are limited to smaller areas within a county. In sparsely populated areas, PUMAs typically comprise one or more neighboring counties within a given state. For example, Los Angeles County in California – with a population of nearly 10 million – is divided into 67 PUMAs, while the state of Wyoming – with a population of approximately 570,000 – is divided into only 4 PUMAs despite having 23 counties. Because of the wide variation in the size of states and counties, PUMAs provide a more “apples-to-apples” picture of the distribution of the uninsured in the country than using state-level or county-level distributions.
About the Maps
We welcome and encourage you to use this information to find out where the uninsured live so you can join the effort to educate the uninsured about the new affordable health coverage options.
The maps and data presented here are for outreach targeting purposes only, and they are not meant to measure the precise number of people who may be eligible for coverage.
Where do the data come from?
The Centers for Medicare and Medicaid Services (CMS) partnered with the Office of the Assistant Secretary for Planning and Evaluation (ASPE) to estimate the number of eligible uninsured people living in each PUMA in the United States. These estimates are available on the CMS website.
CMS and ASPE used the Census Bureau’s 2011 American Community Survey (ACS) for the analysis. All estimates represent the eligible uninsured population aged 0-64 and have been adjusted by ASPE to account for eligibility due to immigration status. Click here for more information on our methodology and a list of frequently asked questions about the tool.