Romeoville is a village in Will County, Illinois, United States. The village is located 26 mi (42 km) southwest of Chicago on the Gateway Wetlands, directly west of the Des Plaines River and Historic U.S. Route 66. Per the 2020 census, the population was 39,863. Once a small river port, Romeoville experienced rapid growth in the 1990s and 2000s. It is located between Bolingbrook and Joliet near Interstate 55 and Interstate 355.