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Oregon Oregon is a city in and the county seat of Ogle County, Illinois, United States.

Orland Hills Orland Hills is a village in Cook County, Illinois, United States.

Orland Park Orland Park is a village in Cook County, Illinois, United States, and a middle - class suburb of Chicago which in 2010 had a population of 56,767.

Oswego Oswego is a village in Kendall County, Illinois, United States.

Ottawa Ottawa is a city located at the confluence of the navigable Illinois River and Fox River in LaSalle County, Illinois, United States.

Palatine Palatine is a village in Cook County, Illinois, United States.

Paris Paris is a city in Paris Township, Edgar County, Illinois, 165 miles south of Chicago and 90 miles west of Indianapolis.

Park Ridge Park Ridge is a city in Cook County, Illinois, United States, and a Chicago suburb.

Paxton Paxton is a city in Ford County, Illinois, United States.

Pekin The city of Pekin is the county seat of Tazewell County in the U.S state of Illinois.