The Cook County Highway Department is responsible for building and maintaining 1,474 miles of county road, as well as 332 traffic signals, 130 bridges and five pumping stations.
Located in the northwest area of Orland Park, District 4 looks after roads in the following communities:
- Orland Park
- Orland Hills
- Tinley Park
- Palos Park, Palos Hills and Palos Heights
- Lemont
- Burbank
- Oak Lawn
- Oak Forest
- Alsip
- Midlothian
- Worth
- Hickory Hills
- Justice
- Bedford Park
- Willow Springs
- Bridgeview
- Chicago Ridge
Several miles of road in unincorporated Cook County also fall under the district's watch.