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Area code(s) 217, 314, 447, 557, 573, 618, 636, 730. Greater St. Louisis the 21st-largest metropolitan statistical area (MSA)in the United States,[3][4]the largest in Missouri, and the second-largest in Illinois. Its core city—St. Louis, Missouri—sits in the geographic center of the metro area, on the west bank of the Mississippi River.
Metro East. The Metro East is an urban area in Southern Illinois, United States that contains the eastern and northern suburbs and exurbs of St. Louis, Missouri. It encompasses eight counties in the Greater St. Louis area and constitutes the second-most populous urban area in Illinois. The region's most populated city is Belleville, with 42,404 ...
East St. Louis, Illinois. / 38.62500°N 90.15750°W / 38.62500; -90.15750. East St. Louis is a city in St. Clair County, Illinois, United States. It is directly across the Mississippi River from downtown St. Louis, Missouri, and the Gateway Arch National Park. East St. Louis is in the Metro East region of Southern Illinois.
The average population of Missouri's counties is 53,880; St. Louis County is the most populous (987,059), and Worth County is the least (1,907). The average land area is 599 sq mi (1,550 km 2 ). The largest county is Texas County (1,179 sq mi, 3,054 km 2 ) and the smallest is St. Louis city (61.9 sq mi, 160 km 2 ).
St. Clair County is the ninth most populous county in Illinois. Located directly east of St. Louis, the county is part of the Metro East region of the Greater St. Louis metropolitan area in southern Illinois. As of the 2020 United States census, St. Clair County had a population of 257,400, making it the third most populous county in Illinois ...
Cities in St. Charles County, Missouri (3 C, 15 P) Cities in St. Louis County, Missouri (3 C, 74 P) St. Louis (20 C, 11 P) Staunton, Illinois (2 C, 3 P)
O'Fallon is a city in St. Clair County, Illinois, United States. The 2020 census listed the population at 32,289. The city is the second largest city in the Metro East region of the St. Louis metropolitan area and Southern Illinois. It sits 5 miles (8.0 km) from Scott Air Force Base and 18 miles (29 km) from Downtown St. Louis .
There are 102 counties in Illinois. The most populous of these is Cook County, the second-most populous county in the United States and the home of Chicago, while the least populous is Hardin County. The largest by land area is McLean County, while the smallest is Putnam County. Illinois's FIPS state code is 17 and its postal abbreviation is IL.