Illinois population, 2010 to 2023
Illinois population stood at 12.5M in 2023, down 0.3% on the previous period.
Illinois population, from the Census Bureau's American Community Survey one-year estimates. The ACS is the country's largest household survey, and these state-level figures are the standard reference for population below the national level. Since 2010 the series has ranged from 12.5 million (2023) to 12.9 million (2013); the latest reading is 12.5 million for 2023, down from 12.6 million the period before.
Survey estimates carry margins of error that grow as geography shrinks; at the state level they are small but real. The 2020 pandemic disrupted collection, which is why some series skip or flag that year.
Why is 2020 missing or unusual?
Are these counts or estimates?
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