| State | Name | Sponsored by |
|---|
| Alabama | Encyclopedia of Alabama | Alabama Humanities Foundation |
| Arkansas | Encyclopedia of Arkansas | Central Arkansas Library System |
| Colorado | Colorado Encyclopedia | History Colorado |
| Connecticut | Encyclopedia of Connecticut Biography (10 vols, 1917–23) | American Historical Association |
| Connecticut | Connecticut History | CThumanities |
| Florida | Floripedia: A Florida Encyclopedia (a collection of links to original sources, not an encyclopedia) | Florida Center for Instructional Technology, University of South Florida |
| Georgia | New Georgia Encyclopedia | Georgia Humanities and the University of Georgia Press |
| Illinois | Encyclopedia of Chicago | Chicago History Museum |
| Indiana | Encyclopedia of Indianapolis | Indianapolis Public Library |
| Kansas | Kansapedia (not to be confused with KansasPedia.com) | Kansas Historical Society (a state agency) |
| Kentucky | The Kentucky Enciclopedia | Universit
|