Well Ohio has a cornacopia of haunts to offer. I live in the Central Ohio area aka: Columbus. So I dont know about any haunts to much farther than Mansfield.
Here are some haunts that I hear alot about:
Haunted Hoochie at Dead Acres
Pataskala, OH
Haunted Hoochie
Terror Park
Columbus, OH
Terror Park
THE HAUNTED PRISON EXPERIENCE 2008
Prison of the Evil Dead
Mansfield, OH
http://www.hauntedx.com
The House of Nightmares
Columbus, OH
The House Of Nightmares
and then we have
Kings Island Halloween Haunt
and
Cedar Point Halloweekends
so yea Im gonna be pretty busy this october