The Rock Island Police Department is divided into three divisions:

• Field Operations Division - the uniformed patrol division of the Rock Island Police Department.
• Criminal Investigations Division - the detective bureau of the Rock Island Police Department and is comprised of the Persons/Property Division, Juvenile Investigations Unit, and the Tactical Operations Unit.
• Technical Services Division - responsible for all record keeping, including evidence retention, sex offender registration, fingerprinting services, abandoned vehicles, animal control, and traffic records.