STATS America is a data portal where visitors can get demographic, workforce, housing, and other data for every state, county, and metro area in the United States. The site is jointly sponsored by the US Commerce Department and Indiana University.
The US Department of Health and Human Services recently announced a new open data initiative, the Community Health Data Initiative, intended to provide tools and data sets for community-level health analysis. As the first part of this initiative, HHS and related government and non-government entities will be collecting and linking to existing data and resources, some of which we've already examined (such as the CountyHealthRankings.org mapplication). The USDA contributes its county-level food and nutrition atlas, useful for visualizing statistics about food deserts, food access, and food insecurity issues, as well as physical activity statistics.