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Link for sources used to compile this list located at the top and bottom of the page.

Name (& Source) County Notes/aka/twp
O'Fallon1, 2 St. Clair .
Oak1, 2 Pope .
Oak Brook2 DuPage .
Oak Forest2 Cook .
Oak Grove2 Lake .
Oak Grove1, 2 McLean .
Oak Grove2 Rock Island .
Oak Hill1, 2 Peoria .
Oak Hills2 St. Clair .
Oak Lawn1, 2 Cook .
Oak Openings2 Kane .
Oak Park1, 2 Cook .
Oak Point1, 2 Clark .
Oak Ridge2 Woodford .
Oak Run2 Knox .
Oakbrook Terrace2 DuPage .
Oakcrest2 Clark .
Oakdale1, 2 Washington .
Oakford1, 2 Menard .
Oakglen1, 2 Cook .
Oakland1, 2, 5 Coles formerly known as Cleaverville11
Oakland Center2 Schuyler .
Oakley1, 2 Macon .
Oakton2 Cook .
Oaktown1 Pulaski .
Oakwood1, 2 Vermilion .
Oakwood Heights2 Madison .
Oakwood Hills2 McHenry .
Obed1, 2 Shelby .
Oblong1, 2 Crawford .
Oconee1, 2 Shelby .
Ocoya (Ocova)1, 2 Livingston .
Odell1, 2 Livingston .
Odgen2 Wabash .
Odin1, 2 Marion .
Ogden1, 2, 6 Champaign .
Ogle1, 2 Mercer .
Ogles1, 2 St. Clair .
Oglesby1, 2 La Salle .
Ohio1, 2 Bureau .
Ohlman1, 2 Montgomery .
Oil Center2 Crawford .
Oil Grove2 Crawford .
Oilfield2 Clark .
Okau5 Washington post office
Okau Settlement5 Macon .
Okawville1, 2 Washington .
Oklahoma2 Kankakee historical
Old Brownfield2 Pope .
Old Dad5 Putnam aka Dad Joe's Grove
Old Du Quoin2 Perry .
Old Gilchrist2 Mercer .
Old Kane2 Greene .
Old Kaskaskia2 Randolph .
Old Marissa2 St. Clair .
Old MazonU Grundy aka Mazon
Old Mill Creek2 Lake .
Old Niota2 Hancock .
Old Owaneco2 Christian .
Old Pearl2 Pike .
Old Princeton2 Cass .
Old Ripley1, 2 Bond founded by the Wheelock brothers15
Old Ripley Township16 Bond .
Old Salem Chautauqua2 Menard .
Old Shawneetown2 Gallatin .
Old Stonington2 Christian .
Oldenburg2 Madison .
Oldtown2 Saline .
Olena1, 2 Henderson .
Olga1, 2 Hamilton .
Olin2 Peoria .
Olive Branch1, 2 Alexander .
Oliver1, 2 Edgar .
Oliver2 Whiteside .
Olivet2 Vermilion .
Olmsted1, 2 Pulaski .
Olmsted's Mound5 Morgan .
Olney1, 2 Richland .
Olympia Fields2 Cook .
Omaha1, 2 Gallatin .
Omar2 Johnson .
Omega1, 2 Marion .
Onarga1, 2 Iroquois .
Oneco1, 2 Stephenson .
Oneida1, 2 Knox .
Ono5 Edgar post office5
Ontario1, 2 Knox .
Ontarioville1, 2 DuPage .
Opa7 Peoria as called by French; west side of Peoria Lake; principal village of Peoria Indians
Opdyke1, 2 Jefferson .
Ophiem1, 2 Henry .
Oquawka1, 2 Henderson .
Ora1 Jackson .
OranU Logan .
Orange1, 2 Clark .
Orange Prairie1, 2 Peoria .
Orangemans Hall2 Mercer .
Orangeville1, 2 Stephenson .
Oraville1, 2 Jackson .
Orchard Mines1 Peoria .
Orchardville1, 2 Wayne .
Oreana1, 2 Macon .
Oregon1, 2 Ogle aka Oregon City5
Orendorff's Mill & Settlement5 Tazewell .
Orient2 Franklin .
Orio2 Wabash .
Orion1, 2 Henry .
Orland Hills1, 2 Cook .
Orland Park1, 2 Cook .
Orleans1, 2 Morgan .
Ormonde1, 2 Warren .
OrndorffU Logan .
OrvilU Logan .
Osage1 Franklin .
Osbernville2 Christian Mosquito twp
Osborn1, 2 Rock Island .
Osceola1, 2 Stark Elmira twp
Osco1, 2 Henry .
Oskaloosa1, 2 Clay .
Osman1, 2 McLean .
Ospur1, 2 DeWitt .
Oswego1, 2 Kendall .
Ottawa1, 2, 5 La Salle .
Otter1, 2 La Salle historical
Otterville1, 2 Jersey .
Otto2 Fulton historical
Otto1, 2 Kankakee .
Ottville2 Bureau .
Out House Settlement5 Clinton .
Ovid3 Jackson 1823 Gazetteer
Owaneco1, 2 Christian aka Locust; post office6
Owen Center1, 2 Winnebago .
Ox Bo1 Putnam .
Oxford3 Hamilton 1823 Gazetteer
Oxford2 Henry historical
Oxville1, 2 Scott .
Ozark1, 2 Johnson .

This Page Was Last Updated Tuesday, 26-Apr-2022 17:28:20 EDT

Sources


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