990 Finder: This search tool from the Foundation Center provides IRS 990 forms, filed annually by nonprofit organizations. Information required on the 990 includes address, officers, program services, gifts received, assets, revenue and expenses, grants paid, and future grants.
Volunteering and Civic Life in America: This site provides a comprehensive look at volunteering and civic life in the 50 states and 51 cities across the country.
United States Elections Project: Voter-eligible turnout : This site provides national and state voting-eligible turnout rates from 1980 onward. Click here to access it.