The Biographical Encyclopædia of Ohio of the Nineteenth Century
- Includes portraits. Also an index. Searchable page images of 1876 book.
- http://quod.lib.umich.edu/cgi/t/text/text-idx?c=moa&idno=AHU5132.0001.001

Ohio History Central
- An evolving, dynamic online encyclopedia that includes information about Ohio's natural history, prehistory and history.
- http://www.ohiohistorycentral.org/

Archival Chronicle
- Newsletter maintained since 1982 by the Center for Archival Collections at Bowling Green State University, with an emphasis on northwest Ohio. Links to most issues online.
- http://www.bgsu.edu/colleges/library/cac/chron.html

H-Ohio Discussion Network
- An electronic discussion group for scholars and teachers interested in the history and culture of the state of Ohio.
- http://www.h-net.org/~ohio/

Little Cities of Black Diamonds
- Historical information, tours and pictures of the mining communities of southern Perry, eastern Hocking and northern Athens counties.
- http://www.littlecitiesofblackdiamonds.org/

Iron Furnace History in Ohio
- History of the iron furnace industry in southern Ohio.
- http://www.oldeforester.com/ironintr.htm

National China Company
- The company operated in Salineville in the early part of the 20th Century. Site includes a brief history, and contains examples of pieces from the author's personal collection.
- http://nationalchina.jdfiles.org/

W. S. George Pottery Company
- Plant operated in East Palestine from in the early to mid twentieth century. The site includes a brief history and examples of pieces from the author's collection.
- http://wsgeorge.jdfiles.org/

Ohio Memory Online Scrapbook
- Primary sources from archives, historical societies, libraries, and museums that document Ohio's past from prehistory through 1903.
- http://www.ohiomemory.org/

African American Experience in Ohio
- Overview of the experiences of African-Americans during the time period 1850 to 1920 in the words of the people that lived them.
- http://dbs.ohiohistory.org/africanam/

Anti-Saloon League of Ohio
- Historical information about the league, which helped bring about the Prohibition.
- http://www.wpl.lib.oh.us/AntiSaloon/

Ohio's Transit History
- Dedicated to the preservation of Ohio's public transit history and vehicles.
- http://www.omot.org/history/index.html

The Buckeye Chronicles
- A compendium of Ohio history.
- http://www.lkwdpl.org/buckeye/index.html