The National Association of State Development Agencies (NASDA) is a membership organization that focuses on state economic development agencies and issues.
The Corporation for Enterprise Development (CFED) has much information on their
web site.
Individual states' economic development sites contain a wealth of economic data. Several interesting websites are those for
Arizona,
Florida,
Nebraska, and
Wisconsin.
At the local level, the site for the
Economic Development Partnership of Roanoke Valley, Virginia, is interesting.