The Communities of
Illinois (IL)

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'Fallon	Oakwood Heights	Old Brownfield	Onarga
	Oakwood Hills	Old Camp	Oneco
Oak	Oakwood Knolls	Old Colony Court	Oneida
Oak Brook	Oakwood Shores	Old Du Quoin	Ontario
Oak Brook Terrace	Oautoga Bluff	Old Evansville (H)	Ontarioville
Oak Forest		Old Farm
Oak Glen	Obed	Old Gilchrist	Opdyke
	Oblong	Old Kane	Opheim
Oak Grove		Old Kaskaskia	Ophiem
- Cass County	Oconee	Old Kent
- Lake County	Ocoya	Old Marissa	Oquawka
- Rock Island County		Old Mill Creek
- Rock Island County	Odell	Old Mill Grove	Orange
- Woodford County	Odgen	Old Niota	Orange Prairie
	Odin	Old Oaks	Orangemans Hall
Oak Hills	Odum Spur	Old Oaks Estates	Orangeville
Oak Lane		Old Orchard	Oraville
Oak Lawn	Ogden	Old Pearl	Orchard Heights
Oak Meadows	Ogden Park	Old Princeton	Orchard Mines
Oak Openings	Ogle	Old Ripley	Orchard Place (H)
Oak Park	Ogles	Old Salem Chautauqua	Orchard Valley
Oak Point	Oglesby	Old Sawmill	Orchardville
		Old Shawneetown	Ordill
Oak Ridge	Ohio	Old Stonington	Oreana
- Lake County	Ohlman	Old Westville (H)	Oregon
- Woodford County		Olde Salem	Orient
	Oil Center	Oldenburg	Orient Junction
Oak Run	- Crawford County	Oldtown	Orio
Oak Spring Woods	- Marion County	Olena	Orion
Oak Valley		Olga	Orland Hills
Oakcrest	Oilfield	Olin	Orland Park
		Olive Branch	Orleans
Oakdale	Okawville		Orleans Terrace
- Cook County	Oklahoma (H)	Oliver	Ormonde
- Washington County		- Edgar County
		- Whiteside County	Osage
Oakenwald			Osbernville
Oakford		Olmsted	Osborn
Oakglen		Olney	Osceola
		Olympia Fields	Osco
Oakland		Olympia Gardens	Oskaloosa
- Coles County		Olympic Terrace	Osman
- Cook County		Olympic Village	Ospur
			Ossami Lake
Oaklawn		Omaha	Oswego
Oakley		Omar
Oakton		Omega	Ottawa
			Otter (H)
Oakwood			Otterville
- DuPage County
- Peoria County			Otto
- Vermilion County			- Fulton County (H)
			- Kankakee County

			Ottville

			Oury Point

			Owaneco
			Owen Center
			Owens Ferry
			Owens Siding
			Owsley

			Oxford (H)
			Oxville

			Ozark

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Last Modified: 22 Oct 2009

The Communities ofIllinois (IL)

The Communities of
Illinois (IL)