Data USA, a project by the M.I.T. Media Lab and Deloitte, is free to use. According to their site:
"Data USA puts public US Government data in your hands. Instead of searching through multiple data sources that are often incomplete and difficult to access, you can simply point to Data USA to answer your questions. Data USA provides an open, easy-to-use platform that turns data into knowledge. It allows millions of people to conduct their own analyses and create their own stories about America – its people, places, industries, skill sets and educational institutions. Ultimately, accelerating society’s ability to learn and better understand itself."Visit Data USA
