Not all counties have Sheriff's Offices. Some, especially the larger ones, have County Police Departments run by a Chief of Police. Other places where a particular town has grown large and taken up practically the whole county have consolidated city and county departments. When such cases occur, there are usually funding problems in continuing to maintain the Sheriff's Office, the workload has become too much for the Sheriff, or county officials want to exert more power over law enforcement. Some counties have BOTH a Sheriff's Office and a County Police Department.
Some places have NO county law enforcement.
The vast majority of municipal departments are small, having 10 or fewer officers. Training to become a city or county police officer consists of attending a municipal police training academy which usually has an extensive curriculum like the BLET in North Carolina . Ann Arbor Detroit Flint Grand Rapids Lansing Sault Ste.