Sister cities of Quincy, Illinois

Quincy (/ˈkwɪnsi/ KWIN-see), known as Illinois' "Gem City," is a river city along the Mississippi River and the county seat of Adams County, Illinois, United States. As of the 2010 census the city held a population of 40,633. It is the principal city of the Quincy micropolitan area, which contains portions of northeastern Missouri and has a population of 77,314 people. During the 19th Century, Quincy was a thriving transportation center as riverboats and rail service linked the city to many destinations west and along the river. It was once Illinois' second-largest city, surpassing Peoria in 1870. The city holds several historic districts, including the Downtown Quincy Historic District and the South Side German Historic District showcasing the architecture of Quincy's many German immigrants from the late-19th century.

Today, Quincy remains a prominent river city. It has been twice recognized as an All-American City and is a participant in the Tree City USA program. In the fall of 2010, Forbes Magazine listed Quincy as the eighth "Best small city to raise a family."