Below is a link to an old list but it should help you out. Their codes are a variation to the Buckeye State Sheriff Codes.
Originally codes were intended to be standard but everyone wanted their own. In Hamilton County there were 5 different sets of codes being used. I could see why they had codes in the 30s and 40s, the radios were new and not that good, but with new technology I'm surprised they haven't done away with them. I believe NIMS doesn't permit them for obvious reasons. Some jurisdictions and especially Fire / EMS have abolished them altogeather. They never were a big secret, most people got copies and they were published in the old Police Call books.
When I first got into scanning in the late 1960s I just asked a deputy and other officers and they gave me copies. Back before all this paranoia set in they didn't mind if you listened. They got a lot of good intel that way back then, people were aware of what was going on and would step up as witnesses. Officers were more accessible to the public then too. It was kinda fun as a hobby trying to figure out the codes, unit numbers, and frequencies back then too, but it all got too big.
RADIO CODES & SIGNALS - OHIO
