Place
- Oak Lawn, Illinois2
- Oak Park, Illinois2
- Oakbrook Terrace, Illinois2
- Olympia Fields, Illinois2
- Orland Hills, Illinois2
- Orland Park, Illinois2
- Palatine, Illinois2
- Palos Heights, Illinois2
- Palos Hills, Illinois2
- Palos Park, Illinois2
- Park City, Illinois2
- Park Ridge, Illinois2
- Phoenix, Illinois2
- Pistakee Highlands, Illinois2
- Port Barrington, Illinois2
- Posen, Illinois2
- Preston Heights, Illinois2
- Prospect Heights, Illinois2
- Ridgewood, Illinois2
- River Forest, Illinois2