- Oak Brook
- Oak Forest
- Oak Lawn
- Oak Park
- Oak Park Township
- Oakbrook Terrace
- Oakland
- Oakwood
- Oakwood Hills
- Oakwood Township
- Odell
- Odell Township
- Ogden
- Ogden Township
- Oglesby
- Old Mill Creek
- Old Town
- Olio
- Olympia Fields
- Onarga
- Onarga Township
- Oneco
- Orangeville
- Oregon
- Oregon-Nashua
- Orland
- Orland Hills
- Orland Park
- Oswego
- Oswego Township
- Ottawa
- Otter Creek
- Otto
- Owen
Illinois Homes for sale & real estate cities starting with "O"
Illinois Cities starting With "O"
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