Grog Shop - Cleveland Heights, Ohio - http://grogshop.gs/ (recommended)
Peabody's - Cleveland, Ohio - http://peabodys.com/
Now That's Class - Cleveland, Ohio - http://www.nowthatsclass.net/
Blossom Music Center - Cuyahoga Falls, Ohio - http://www.theblossommusiccenter.com/
Musica - Akron, Ohio - http://www.akronmusica.com/ (recommended)
Newport Music Hall - Columbus, Ohio - http://www.promowestlive.com/index_c....php?venue=new
The LC Pavilion - Columbus, Ohio - http://www.promowestlive.com/index_c....php?venue=new
The Basement - Columbus, Ohio - http://www.promowestlive.com/index_c....php?venue=new (not recommended)
Skully's Music Diner - Columbus, Ohio - http://skullys.org/ (recommended)
Frankie's - Toledo, Ohio - http://www.frankiesinnercity.com/
Headliners - Toledo, Ohio - http://www.headlinerstoledo.com/ (recommended)
The Omni - Toledo, Ohio - http://www.omnimidwest.com/ (not recommended)
Bogart's - Cincinnati, Ohio - http://bogarts.com/index
Some other venues that I have been to.
Metro - Chicago, Illinois - http://metrochicago.com/ (recommended)
The Loft - Lansing, Michigan - http://theloftlansing.com/ (recommended)
Adding to the Ohio list:
Rumba Cafe (Columbus) - this place is tiny! 200 capacity MAYBE. Saw mewithoutyou w/ Sainthood reps here. PACKED.
Ace of Cups (Columbus) - love this place. Saw Purity Ring here. Basically all shows here end after midnight.
Scarlet and Grey Cafe (Columbus) - pretty much just local bands play here.
The Bluestone (Columbus) - old church converted to a bar/venue. Occasional national acts. 400ish capacity.
A&R Music Bar (Columbus) - Upstairs in the same building as The Basement. I prefer this place but it doesnt get as many tours. For some reason Three Days Grace was booked to play here (wtf?)
The Underground (Cincinnati)
The 86 Club (Cincinnati)
20th Century Theatre (Cincinnati)