"The most complete data on the economics and business of U.S. pro sports leagues in existence." Data is stored in a Google Drive folder. Make sure to click the "Read Me First" to learn what's in there and how it's organized.
John Vrooman is a sports econ professor at Vanderbilt. On his webpage, find many links to sports data sources, articles, and research.
If you want to see an article or publication that is behind a paywall, search for it at the University Libraries, or Ask a Librarian.
Has comprehensive summary statistics of the United States. Search by keyword. For example, a search for "sports and athletics" returns results of some basic statistics/data.
College and professional football statistics: summary, selected years, selected spectator sports, selected years, adult attendance at sports events, by frequency, participation in National Collegiate Athletic Association sports and high schooll athletics programs.
Access: Off Campus Access is available for: UNC-Chapel Hill students, faculty, and staff; UNC Hospitals employees; UNC-Chapel Hill affiliated AHEC users. North Carolina residents with a borrower's card may access from off campus by visiting NCLive directly. Contact the Davis Library Service Desk for the NCLive password. Coverage: 2013 - Present