Cities in State of Illinois, United States ( 474 )
- Mount Vernon, Illinois
- Mount Zion, Illinois
- Mundelein, Illinois
- Murphysboro
- Naperville
- Nashville
- New Baden
- New Lenox
- Newton, Illinois
- Niles, Illinois
- Normal, Illinois
- Norridge
- North Aurora
- North Barrington
- North Chicago
- North Peoria
- North Riverside
- Northbrook, Illinois
- Northfield, Illinois
- Northlake, Illinois
- Oak Brook, Illinois
- Oak Forest
- Oak Lawn, Illinois
- Oak Park, Illinois
- O'Fallon, Illinois
- Oglesby, Illinois
- Olney, Illinois
- Olympia Fields
- Oregon, Illinois
- Orland Hills
- Orland Park
- Oswego, Illinois
- Ottawa, Illinois
- Palatine, Illinois
- Palos Heights
- Palos Hills