HUD has released its latest Comprehensive Housing Affordability Strategy (CHAS) data. The five-year (2008-2012) data are used by state and local governments to examine housing need trends. The data are available at the state, county, place, and census tract level.
HUD uses the data to allocate grant funding, and state and local governments use CHAS data to draft their Five-Year Consolidated Plans and Annual Action Plans. Users can either download the raw data files, or use the more accessible and usable CHAS data query generator. The data query can be used to determine the number of low and moderate income households by income subgroup, and the number of households with a housing cost burden, those spending more than 30% of their income for housing.
The latest CHAS data can be downloaded at http://www.huduser.org/portal/datasets/cp/CHAS/data_download_chas.html
The data query table is at http://www.huduser.org/portal/datasets/cp/CHAS/data_querytool_chas.html