Romeoville is a village in Will County, Illinois, United States. The population was 39,680 at the 2010 census. It is located in the southwest suburban area of Chicago near the newly constructed I-355 extension south from the Stevenson Expressway (I-55) to I-80.
Romeoville is located at 41°38′26″N 88°6′10″W (41.640480, -88.102907).
According to the 2010 census, Romeoville has a total area of 18.759 square miles (48.59 km2), of which 18.44 square miles (47.76 km2) (or 98.3%) is land and 0.319 square miles (0.83 km2) (or 1.7%) is water.