The South Portland Police Department is organized into Police Administration, the Patrol and Community Services Division and the Investigative and Support Services Division.

The Police Administration consists of the Office of the Chief of Police and the Office of the Deputy Chief.

The Patrol and Community Services Division is the largest and is considered to be the "backbone" of the department. This division is composed of uniformed patrol and plainclothes officers. Assignments within this division include a School Resource officer, K-9 Teams, , Drug Recognition Experts, and a Community Response Unit.

The Investigative and Support Services Division is comprised of detectives, technical services or crime scene staff, as well as the Public Safety Communications (Dispatch) personnel. Detective and Crime Scene personnel are assigned to follow-up on the more serious crimes, as well as the offenses that require extensive follow-up or specialized investigation. The Public Safety Communications personnel staff the phones and dispatch police, fire and rescue units to requests for service.