Mason City, IL
Mason City is a city in Mason County, Illinois, United States. The population was 2,558 at the 2000 census, and 2,324 at a 2009 estimate.
Mason City is located at 40°12′11″N 89°41′46″W / 40.20306°N 89.69611°W / 40.20306; -89.69611 (40.202965, -89.696109).
According to the United States Census Bureau, the city has a total area of 1.0 square miles (2.5 km²), all of it land.