The Communities of
Illinois (IL)


A B C D E F G H I J K L M
N O P Q R S T U V W X Y Z
 

Notes: - Some communities no longer exist and have been marked with '(H)' to indicate that they are historic.
 
- When two (or more) communities share the same name, we give some kind of identifying location to help you pick.
 


O'FallonOdellOnarga
O'Fallon DepotOdgenOneco
O'Fallon JunctionOdinOneida
 Odum SpurOntario
Oak Ontarioville
Oak BrookOgden 
Oak Brook TerraceOgden ParkOpdyke
Oak ForestOgleOpheim
Oak GlenOglesOphiem
 Oglesby 
Oak Grove Oquawka
- Cass CountyOhio 
- Lake CountyOhlmanOra
- McLean County Orange
- Rock Island CountyOil CenterOrange Prairie
- Rock Island County- Crawford CountyOrangemans Hall
- Woodford County Orangeville
 Oil CenterOraville
Oak Hill- Marion CountyOrchard Heights
Oak Hills Orchard Mines
Oak LaneOil GroveOrchard Place (H)
Oak LawnOilfieldOrchard Valley
Oak Meadows Orchardville
Oak MoundOkawvilleOrdill
Oak OpeningsOklahoma (H)Oreana
Oak Park Oregon
Oak PointOld BrownfieldOrient
 Old CampOrient Junction
Oak RidgeOld Colony CourtOrio
- Lake CountyOld Du QuoinOrion
- Woodford CountyOld Evansville (H)Orland
 Old FarmOrland Hills
Oak Ridge NorthOld GilchristOrland Park
Oak RunOld HarmonyOrleans
Oak Spring WoodsOld KaneOrleans Terrace
Oak ValleyOld KaskaskiaOrmonde
Oak WoodsOld Kent 
OakcrestOld MarissaOsage
 Old Mill CreekOsbernville
OakdaleOld Mill GroveOsborn
- Cook CountyOld NiotaOsceola
- Washington CountyOld OaksOsco
 Old Oaks EstatesOskaloosa
Oakdale WoodsOld OrchardOsman
OakenwaldOld PearlOspur
OakfordOld PrincetonOssami Lake
OakglenOld RipleyOswego
 Old Salem Chautauqua 
OaklandOld SawmillOttawa
- Coles CountyOld ShawneetownOtter (H)
- Cook CountyOld StoningtonOtterville
- Saint Clair CountyOld Westville (H) 
 Olde SalemOtto
Oakland CenterOldenburg- Fulton County (H)
OaklawnOldtown- Kankakee County
OakleyOlena 
OaktonOlgaOtto Mall
OaktownOlinOttville
OakvilleOlive Branch 
Oakville Station Oury Point
 OliverOuter Depot
Oakwood- Edgar CountyOutten
- DuPage County- Whiteside County 
- Peoria County Ovington
- Vermilion CountyOlivet 
 OlmstedOwaneco
Oakwood EstatesOlneyOwen
Oakwood HeightsOlympia FieldsOwen Center
Oakwood HillsOlympia GardensOwens Ferry
Oakwood KnollsOlympic TerraceOwens Siding
Oakwood ShoresOlympic VillageOwsley
Oautoga Bluff  
 OmahaOx Bow
ObedOmarOxford (H)
OblongOmegaOxville
   
Oconee Ozark
Ocoya