Pike County /

Pike County is a county located in the U.S. state of Illinois. As of 2010, the population was 16,430. Its county seat is Pittsfield, Illinois. According to the 2000 census, the county has a total area of 848.87 square miles (2,198.6 km), of which 830.30 square miles (2,150.5 km) (or 97.81%) is land and 18.57 square miles (48.1 km) (or 2.19%) is water. Pike County is located on the highlands between the Illinois River on the eastern border, and the Mississippi River on the west. It has two interstate highways, I-72, with bridges spanning both rivers to enter the county and I-172 which only extends about 300 feet (91 m) into the county where it ends at its southern terminus with I-72. Atlas, Barry, Chambersburg, Cincinnati, Derry, Detroit, Fairmount, Flint, Griggsville, Hadley, Hardin, Kinderhook, Levee, Martinsburg, Montezuma, New Salem, Newburg, Pearl, Petty, Pittsfield, Pleasant Hill, Pleasant Vale, Ross, Spring Creek Pike County, Illinois, is one of the few counties in the United States to border as many as nine counties. Illinois has two such counties—Pike and LaSalle. It is also one of the few counties in the United States to border its namesake in another state—in this case,