Illinois cities which start with the letter O.

Illinois Zip Codes

PlacePlace Type2010 Population
O Fallon
Oak Brk Mall
Oak Brook village 7796
Oak Brook Mall
Oak Forest city 27962
Oak Lawn village 56690
Oak Park village 51878
Oak Ridge
Oak Run
Oakbrook Ter
Oakbrook Terrace city 2134
Oakdale village 221
Oakford village 286
Oakland township 135
Oakley township 1082
Oakwood village 1595
Oakwood Hills village 2030
Oblong village 1466
Oconee village 180
Ocoya
Odell village 1046
Odgen
Odin village 1076
Ogden village 810
Ogden Park
Oglesby city 3791
Ohio village 513
Ohio Grove township 279
Ohlman village 135
Okawville village 1434
Old Berlin
Old Camp
Old Gilchrist
Old Kane
Old Mill Creek village 16
Old Ripley village 108
Old Shawneetown village 193
Old Stonington
Oldtown
Olena
Olive Branch
Oliver
Olmsted village 333
Olney city 9115
Olympia Fields village 4471
Olympia Flds
Omaha village 266
Omega township 501
Onarga village 1368
Oneco township 1331
Oneida city 700
Ontario Street
Ontarioville
Opdyke
Opheim
Ophiem
Oquawka village 1371
Orangeville village 789
Oraville
Orchard Heights
Orchard Mines
Orchardville
Oreana village 875
Oregon city 3721
Orel township 1420
Orient city 358
Orion village 1861
Orland Hills village 7149
Orland Park village 184
Ormonde
Osceola township 1014
Osco township 459
Oskaloosa township 322
Ospur
Ossami Lake
Oswego village 27687
Otego township 1511
Otis Grant Collins
Ottawa city 0
Otter Creek township 2970
Otterville town 126
Otto Mall
Ottoville
Owaneco village 239
Owego township 328
Ozark

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