Illinois 203 could refer to:
Illinois Route 203 (IL 203) is a 9.51-mile-long (15.30 km) north–south state highway in the southwestern part of the U.S. state of Illinois. It travels from just south of I-55/I-70/US 40 around Gateway International Raceway at Collinsville Road in Fairmont City, north to I-270 near Pontoon Beach. IL 203 is a former segment of US 66.
Will County is a county in the northeastern part of the state of Illinois. According to the 2010 census, it had a population of 677,560, which is an increase of 34.9% from 502,266 in 2000, making it the fourth-most populous county in Illinois. The county seat is Joliet.
Naperville Community Unit School District 203 is a school district headquartered in Naperville, Illinois, United States.
St. Clair County is the oldest county in the U.S. state of Illinois; its western border is formed by the Mississippi River. According to the 2010 United States Census, it had a population of 270,056, making it the eighth-most populous county in Illinois and the most populous in the southern portion of the state. Its county seat is Belleville. The county was founded in 1790 by the government of the Northwest Territory, before the establishment of Illinois as a state. Cahokia Village in the county was founded in 1697 and was a French settlement and former Jesuit mission.
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Barrington Township is one of 29 townships in Cook County, Illinois, USA. As of the 2010 census, its population was 15,636. The northwestern corner of the Cook County panhandle, it is the county's northwesternmost township. It is also by far the least densely populated township in the county, with less than half the population density of the next least Lemont Township.
Aroma Township is one of seventeen townships in Kankakee County, Illinois, USA. As of the 2010 census, its population was 5,157 and it contained 2,203 housing units.
Paris Township is one of fifteen townships in Edgar County, Illinois, USA. As of the 2010 census, its population was 9,865 and it contained 4,763 housing units.
Saint Anne Township is one of seventeen townships in Kankakee County, Illinois, USA. As of the 2010 census, its population was 2,191 and it contained 943 housing units. The township was created on March 11, 1857 from parts of Aroma Township.
Lisle Township is one of nine townships in DuPage County, Illinois, USA. As of the 2010 census, its population was 116,268 and it contained 47,174 housing units.
Naperville Township is one of nine townships in DuPage County, Illinois, USA. As of the 2010 census, its population was 100,019 and it contained 39,999 housing units.
Winfield Township is one of nine townships in DuPage County, Illinois, USA. As of the 2010 census, its population was 46,233 and it contained 15,856 housing units. It is the least populous of the DuPage County Townships.
Douglas Township is one of twenty-six townships in Iroquois County, Illinois, USA. As of the 2010 census, its population was 2,104 and it contained 923 housing units. Douglas Township was formed from a portion of Onarga Township in May 1858.
Oquawka Township is one of eleven townships in Henderson County, Illinois, USA. As of the 2010 census, its population was 1,997 and it contained 1,117 housing units.
Pleasant Mound Township is one of nine townships in Bond County, Illinois, USA. As of the 2010 census, its population was 1,018 and it contained 498 housing units.
Bear Grove Township is one of twenty townships in Fayette County, Illinois, USA. As of the 2010 census, its population was 599 and it contained 259 housing units. The township was originally known as Johnson Township.
Kaskaskia Township is one of twenty townships in Fayette County, Illinois, USA. As of the 2010 census, its population was 650 and it contained 289 housing units.
Loudon Township is one of twenty townships in Fayette County, Illinois, USA. As of the 2010 census, its population was 954 and it contained 418 housing units.
Otego Township is one of twenty townships in Fayette County, Illinois, USA. As of the 2010 census, its population was 1,511 and it contained 666 housing units. Its name changed from Cumberland township on September 24, 1860. Overcup Church is located in this township.
Sefton Township is one of twenty townships in Fayette County, Illinois, USA. As of the 2010 census, its population was 599 and it contained 256 housing units.
Shafter Township is one of twenty townships in Fayette County, Illinois, USA. As of the 2010 census, its population was 485 and it contained 201 housing units. Shafter Township was formed out of Sharon Township in December, 1920.
Sharon Township is one of twenty townships in Fayette County, Illinois, USA. As of the 2010 census, its population was 2,441 and it contained 425 housing units.
Vandalia Township is one of twenty townships in Fayette County, Illinois, USA. As of the 2010 census, its population was 6,629 and it contained 3,115 housing units.