At -0.17% per year, it is ahead of only West Virginia. Illinois Population 2020. Illinois Population 2020. The 2015 Census estimates put the population at 12,859,995, which was a decrease from the 2014 numbers. The state’s capital city is Springfield but the largest city by population in Illinois is Chicago with population close to 2.7 million. Illinois suffered its sixth consecutive year of population decline in 2019, driven entirely by residents leaving for other states. Chicago is another city that brings in a lot of people due to various reasons, one of them being a lifestyle. Springfield is the capital city and one of the most important centers of Illinois. Illinois is one of only 7 states that has a negative growth rate in 2016. Illinois saw nation’s worst population loss during the decade. It is also the 12th most densely populated state in US behind California.

Illinois has the fifth largest population in USA with population close to 12.8 million, which accounts for 3.9% of the US population. Population Of Illinois 2020: (Population Growth, Demography And Facts) up26 October 9, 2019 State No Comments. Population of Counties in Illinois (2020) In 2019, the most highly populated county within … 12,659,682. Illinois as a state is located in the mid-west part of the United States. Aurora Illinois Population 2020 2019, Aurora Illinois Population 2019, Aurora Illinois Population 2020, Aurora Illinois Demographics 2020 2019, Aurora Illinois Statistics 2020 2019