Ohio Art League Artist Registry (Ohio only)
http://www.oal.org/artframes.html

Colorado Artists Register (Colorado only)
http://www.artistsregister.com

Maryland Artist Slide Registry (Regional)
http://www.artistregistry.org/msac

World Wide Arts Resources
http://www.worldwideartsresources.com

Artists Archives of the Western Reserve (Northeast Ohio only)
http://www.artistsarchives.org