Pontiac is a city in Livingston County, Illinois, United States. The population was 11,931 at the 2010 census. It is the county seat of Livingston County. The town is also the setting of the 1984 movie Grandview, U.S.A.
Pontiac is located at 40°52′48″N 88°37′49″W / 40.88°N 88.63028°W / 40.88; -88.63028.
According to the United States Census Bureau, the city has a total area of 5.2 square miles (13.6 km²), of which, 5.2 square miles (13.6 km²) of it is land and 0.19% is water.