Founded in 1839, Carroll County is one of 102 counties in the state of Illinois. Historically, Carroll County was formed from Jo Daviess. The city of Mount Carroll is the county seat. With FIPS code of 15, Carroll County has a population of 15,698 and area of 445 square miles (1,153 km2).
List of all cities in Carroll County, IL alphabetically
|City/Town||Postal Code||Area Code|
|Lake Carroll, IL||61046||815/779|
|Mount Carroll, IL||61053||815/779|
|Savanna Army Depot, IL||61074||815/779|