OLREC serves 6 Police departments (Alsip, Bridgeview, Burbank, Evergreen Park, Hodgkins and Oak Lawn) and 7 Fire departments (Bedford Park, Bridgeview, Burbank, Central Stickney, Evergreen Park, North Palos, Oak Lawn, and Summit) .  Lyons Fire Department (154.25, 146.2 PL) has also been listed as a served agency in the past.  (Staffing by NORCOMM.)

MABAS Division 21 (all dispatched on 155.5575 91.5 PL)
Bedford Park (Battalion 7, 700s), dispatched by OLREC
Bridgeview (Battalion 40, 400s), dispatched by OLREC
Burbank (Battalion 2, 200s), dispatched by OLREC
Central Stickney (900-910), dispatched by OLREC
Chicago Ridge (Battalion 6, 6500s), dispatched by OLREC (formerly by Southwest Central Dispatch)
Evergreen Park (33-50s), dispatched by OLREC
Hometown (460s, 470s), dispatched by Hickory Hills Consolidated Dispatch Center
North Palos FPD (Battalion 8, 800s), dispatched by OLREC (formerly by Southwest Central Dispatch)
Oak Lawn (Battalion 1, 1-3), dispatched by OLREC
Roberts Park FPD (Battalion 3, 31-32), dispatched by OLREC (formerly by Southwest Central Dispatch)
Summit (950s), dispatched by OLREC (formerly by Hickory Hills Consolidated Dispatch Center)