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The Quincy–Hannibal, IL–MO Combined Statistical Area, as defined by the United States Census Bureau, is an area consisting of one county in Western Illinois and three counties in northeast Missouri, anchored by the cities of Quincy and Hannibal. As of the 2020 census, the μSA had a population of 114,649. [1]
Knox would later become a county in Indiana and is unrelated to the current Knox County in Illinois, while St. Clair would become the oldest county in Illinois. 15 counties had been created by the time Illinois achieved statehood in 1818. The last county, Ford County, was created in 1859.
The Illinois side includes Henry County, Mercer County, and Rock Island County. [4] In extreme northwestern Illinois the Driftless Zone, a region of unglaciated and therefore higher and more rugged topography, occupies a small part of the state. Charles Mound, located in this region, is the state's highest elevation above sea level.
Quincy (/ ˈ k w ɪ n s i / KWIN-see) is a city in and the county seat of Adams County, Illinois, United States, located on the Mississippi River. [4] The population was 39,463 as of the 2020 census, down from 40,633 in 2010. The Quincy micropolitan area had 114,649 residents. [5]
The Office of Management and Budget (OMB) has designated more than 1,000 statistical areas for the United States and Puerto Rico. [2] These statistical areas are important geographic delineations of population clusters used by the OMB, the United States Census Bureau, planning organizations, and federal, state, and local government entities.
Williamson County is a county in Southern Illinois. At the 2020 census, it had a population of 67,153. [1] The largest city and county seat is Marion. [2] Williamson County is included in the Carbondale-Marion, IL Metropolitan Statistical Area. This area of Southern Illinois is known locally as "Little Egypt". [citation needed]
Saline County is a county in Southern Illinois. At the 2020 census , it had a population of 23,768. [ 1 ] The largest city and county seat is Harrisburg . [ 2 ]
Alexander County is the southernmost county in the U.S. state of Illinois. As of the 2020 census , the population was 5,240. [ 1 ] Its county seat is Cairo [ 2 ] and its western boundary is formed by the Mississippi River .