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Columbia is a city mainly in Monroe County with a small portion in St. Clair County in the U.S. state of Illinois, about 12 miles (19 km) south of St. Louis, Missouri. The population was 10,999 at the 2020 census .
Illinois's FIPS state code is 17 and its postal abbreviation is IL. What is now Illinois was claimed as part of Illinois County, Virginia, between 1778 and 1782. Modern-day county formation dates to 1790 when the area was part of the Northwest Territory; two counties—St. Clair and Knox—were created at that time.
Illinois Route 64 (IL 64, Illinois 64) is an east–west state highway in Northern Illinois. Its western terminus is at the Iowa state line, connecting with U.S. Route 52 (US 52) and Iowa Highway 64 via the Dale Gardner Veterans Memorial Bridge at the Mississippi River west of Savanna .
Illinois' population slightly declined in 2020 from the 2010 United States census by just over 18,000 residents and the overall population was quite higher than recent census estimates. [84] Illinois 2020 Population Density Map. Illinois is the most populous state in the Midwest region.
Monroe County is a county located in the U.S. state of Illinois.According to the 2020 census, it had a population of 34,962. [1] Its county seat and largest city is Waterloo. [2]
Interstate 255 (I-255) is a bypass route of I-55 in Greater St. Louis.Along with I-270, it forms a loop around the central portion of the bi-state metro area; a majority of I-255 is located on the Illinois half.
Illinois Route 13 (IL 13) is a major east–west state route in southern Illinois. Illinois 13 has its western terminus at Cahokia Heights at Illinois Route 157 and its eastern terminus at the Kentucky state line and the Ohio River, at Kentucky Route 56. This is a distance of 151.54 miles (243.88 km). [1]
Up until 1935, Illinois Route 12 (IL 12) followed roughly along the old alignment of US 50 from the Missouri state line east of St. Louis to the Indiana state line west of Vincennes, IN. [4] By 1935, IL 12 was decommissioned.