List of O.. Illinois settlements in ABC order. Found 42 settlements. More popular settlements are written with larger fonts.
O'Fallon city, IL (St. Clair County)
Oak Brook village, IL (Cook County)
Oak Forest city, IL (Cook County)
Oak Grove village, IL (Rock Island County)
Oak Lawn village, IL (Cook County)
Oak Park village, IL (Cook County)
Oakbrook Terrace city, IL (DuPage County)
Oakdale village, IL (Washington County)
Oakford village, IL (Menard County)
Oakland city, IL (Coles County)
Oakwood Hills village, IL (McHenry County)
Oakwood village, IL (Vermilion County)
Oblong village, IL (Crawford County)
Oconee village, IL (Shelby County)
Odell village, IL (Livingston County)
Odin village, IL (Marion County)
Ogden village, IL (Champaign County)
Oglesby city, IL (LaSalle County)
Ohio village, IL (Bureau County)
Ohlman village, IL (Montgomery County)
Okawville village, IL (Washington County)
Old Mill Creek village, IL (Lake County)
Old Ripley village, IL (Bond County)
Old Shawneetown village, IL (Gallatin County)
Olmsted village, IL (Pulaski County)
Olney city, IL (Richland County)
Olympia Fields village, IL (Cook County)
Omaha village, IL (Gallatin County)
Onarga village, IL (Iroquois County)
Oneida city, IL (Knox County)
Oquawka village, IL (Henderson County)
Orangeville village, IL (Stephenson County)
Oreana village, IL (Macon County)
Oregon city, IL (Ogle County)
Orient city, IL (Franklin County)
Orion village, IL (Henry County)
Orland Hills village, IL (Cook County)
Orland Park village, IL (Cook County)
Oswego village, IL (Kendall County)
Ottawa city, IL (LaSalle County)
Otterville town, IL (Jersey County)
Owaneco village, IL (Christian County)
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