The City of Lebanon was established in 1814 in the northeast corner of St. Clair County.

The Police Department was originally housed with the Fire and Ambulance Departments located at 312 West St. Louis Street.

In 1998, as the Police Department expanded from six full time Officers to 12 full time Officers, more space was needed.  The Department moved to their current location at 403 West St. Louis Street.

To date, the Police Department has a Chief and 10 Officers, plus a small contingent of Auxiliary Officers with special skills that assist the Department with special operations.