Contact Us Location: Trumbull County Administration Building 160 High Street NW, 5th Floor Warren, Ohio 44481 Phone: (330) 675-2451 Fax:       (330) 675-2462 Email:   commissioners@co.trumbull.oh.us Below is a map of our location in downtown Warren, Ohio, indicated by the red star. We are located in the County Administration Building on the 5th floor.    Site design by Lisa Hovance, Trumbull County IS Department Site hosted by Micro Doctor Inc.