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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.
According to the 2020 United States census Illinois is the 6th most populous state with 12,812,508 inhabitants but the 24th largest by land area spanning 55,499.0 square miles (143,742 km 2) of land. [1] Illinois is divided into 102 counties and, as of 2020, contained 1,300 municipalities consisting of cities, towns, and villages.
The 25 least populous states contain less than one-sixth of the total population. California, the most populous state, contains more people than the 21 least populous states combined, and Wyoming, the least populous state, has a population less than any of the 31 most populous U.S. cities. [needs update]
Illinois saw a decrease in new residents between July 2020 and July 2023, according to new estimates from the U.S. Census Bureau.The Census Bureau recently released its vintage population totals ...
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.
Shaded areas of the tables indicate census years when a territory or the part of another state had not yet been admitted as a new state. [a] Since 1920, the "total population" of the United States has been considered the population of all the States and the District of Columbia; territories and other possessions were counted as additional ...
Map of states shaded by population density (2020) This is a list of the 50 states, the 5 territories, and the District of Columbia by population density, population size, and land area. It also includes a sortable table of density by states, territories, divisions, and regions by population rank and land area, and a sortable table for density ...
Population of Illinois: 12,830,632 (2010 U.S. Census [2]) ... State of Illinois becomes 21st State admitted to the United States of America on December 3, 1818