Carrollton is a city in and the county seat of Greene County, Illinois, United States. The population was 2,485 as of the 2020 census. Carrollton is located in south-central Greene County at 39°17′48″N 90°24′29″W / 39.29667°N 90.40806°W. U.S. Route 67 passes through the city as 5th Street, leading north 35 miles to Jacksonville and south 32 miles to Alton on the Mississippi River. Illinois Route 108 crosses US 67 in the center of town, leading east 29 miles to Carlinville and west 11 miles to Kampsville on the Illinois River.
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