Our Government Documents Department has links for Wisconsin, Minnesota, and local government information.
The federal government is the world's largest English language publisher. Here are some of their links:
The Statistical Abstract of the United States digests the feds. major sources.
usa.gov is also a U.S. government gateway.
The Census Bureau's website.
Here are some other good sites, County Business Patterns, ZIP Code Business Patterns, and The Bureau of Labor Statistics.
Here is one that isn't from the federal government: The Roper Center for Public Opinion Research.
Many of the public and private business statistical sources list information by North American Industry Classification System (NAICS) code.