Nearly all Illinois counties lost population in 2020; Adams County down 619 people

Leaving Illinois sign

By BRYCE HILL
Illinois Policy

Census estimates tallied population decline in 98 of Illinois’ 102 counties. Only Los Angeles County lost more people than Cook County last year.

Illinois’ population decline hasn’t just affected select areas of the state: New data from the U.S. Census Bureau estimates only four of the state’s 102 counties avoided losing people from July 2019-July 2020. One of those four avoided a loss by gaining one person.

Statewide, the decline in population was driven entirely by people moving out of the state. That was also the primary reason for population decline across Illinois counties.

Adams County lost 619 people in the Census estimates. Pike County lost 335 people, Hancock County lost 278 and Brown County lost 73.

People didn’t leave Adams County, though, as fast as they left the three neighboring counties. For every 1,000 people, Pike County had a population change of minus-21.51 percent. That figure was minus-15.71 for Hancock County, minus-11.03 for Brown County and minus-9.46 for Adams County.

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