Illinois Neighborhoods O

• O'Fallon (43)
• O'Hare (10)
• Oak Park (98)
• Old Irving Park (15)
• Old Town (132)
• Outer Loves Park/Machesney Park (9)
• Outer Northwest Rockford (35)
• Outer Rock Island/Moline (12)
• Outer South Rockford (18)
• Overlook (5)