These data represent the National Center for Charitable Statistics (NCCS) IRS Business Master File of all tax exempt organizations registered with the IRS at the date marked on the file.

National Center for Charitable Statistics (NCCS) consolidations of the IRS Return Transaction File, containing all organizations of the given type (public charity, private foundation, or other tax exempt organization) filing a Form 990 or 990-EZ.

These data are the National Center for Charitable Statistics (NCCS) cumulative listing of public charities filing Form 990 and Form 990-EZ for FY 1998-2003.

This is a listing compiled by the Urban Institute of datasets and data tools that have data below the city level and are available for the nation. Topics include housing, education, health, environment, and others. Geographic level and years covered vary by dataset.