Illinois Cities & Towns - Alphabetical Index of Populated Places

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Illinois "o" Cities, Towns, Neighborhoods & Other Populated Places

Cities & Towns are in bold, while neighborhoods, subdivisions & other populated places are in standard text.
Incorporated Places have an asterisk (*).

Oak
Oak Brook*
Oak Forest*
Oak Grove
Oak Grove
Oak Grove*
Oak Hill
Oak Hills
Oak Lane
Oak Lawn*
Oak Openings
Oak Park*
Oak Point
Oak Ridge
Oak Ridge
Oak Ridge North
Oak Run
Oak Valley
Oakbrook Estates MH Park
Oakbrook Terrace*
Oakcrest
Oakdale*
Oakenwald
Oakford*
Oakglen
Oakland
Oakland*
Oakland Center
Oakley
Oakton
Oakwood*
Oakwood Estates
Oakwood Heights
Oakwood Hills*
Oasis MH Park
Oasis Trailer Park
Obed
Oblong*
Oconee*
Ocoya
Odell*
Odgen
Odin*
O'Fallon*
Ogden*
Ogle
Ogles
Oglesby*
Ohio*
Ohlman*
Oil Center
Oil Grove
Oilfield
Okawville*
Old Brownfield
Old Colony Court
Old Du Quoin
Old Gilchrist
Old Kane
Old Kaskaskia
Old Kent
Old Marissa
Old Mill Creek*
Old Mill Grove
Old Niota
Old Oaks
Old Oaks Estates
Old Pearl
Old Princeton
Old Ripley*
Old Salem Chautauqua
Old Sawmill
Old Shawneetown*
Old State MH Village
Old Stonington
Oldenburg
Oldtown
Olena
Olga
Olin
Olive Branch
Oliver
Oliver
Oliver Lane Subdivision
Olivet
Olmsted*
Olney*
Olsen-Hansen Row Houses
Olson's Subdivision
Olympia Fields*
Omaha*
Omar
Omega
Onarga*
Oneco
Oneida*
Ontario
Ontarioville
Opdyke
Ophiem
Oquawka*
Orange
Orange Prairie
Orangemans Hall
Orangeville*
Oraville
Orchard Subdivision
Orchardville
Oreana*
Oregon*
Orient*
Orio
Orion*
Orland Hills*
Orland Park*
Orleans
Ormonde
Osbernville
Osborn
Osceola
Osco
Oskaloosa
Osman
Ospur
Oswego*
Ottawa*
Otterville*
Otto
Ottville
Oury Point
Owaneco*
Owen Center
Oxville
Ozark