Cincinnati Backpage
http://cincinnati.backpage.com/gyrobase/classifieds/index
This is a national classified database with a large Cincinnati page. It takes time to sift through the job listings (searchable only by category and keyword), but with more than 2,000 jobs, this is a very comprehensive list.

Jobs in Cincinnati
http://www.jobsincincinnati.com
Visitors to this site can search for available jobs, find out about upcoming job fairs in the area and read articles with helpful advice for job seekers. There is also a news section detailing current business happenings.

This is just a sample of what you'll find in the complete Cincinnati guide.