Carrollton is a city in Greene County, Illinois, United States. The population was 2,484 as of the 2010 census. It is the county seat of Greene County.Carrollton is located in south-central Greene County at 39°17′48″N 90°24′29″W (39.296662, -90.408059). U.S. Route 67 passes through the city as 5th Street, leading north 35 miles (56 km) to Jacksonville and south 32 miles (51 km) to Alton on the Mississippi River. Illinois Route 108 (Main Street) crosses US 67 in the center of town, leading east 29 miles (47 km) to Carlinville and west 11 miles (18 km) to Kampsville on the Illinois River. According to the 2010 census, Carrollton has a total area of 1.902 square miles (4.93 km2), of which 1.9 square miles (4.92 km2) (or 99.89%) is land and 0.002 square miles (0.01 km2) (or 0.11%) is water.
It is located 68 miles (109 km) southwest of Springfield, the state capital, and is 60 miles (97 km) north of St. Louis, Missouri. Greene County borders the Metro East area. As of the census of 2000, there were 2,605 people, 1,077 households, and 724 families residing in the city. The population density was 1,561.2 people per square mile (602.3/km2). There were 1,175 housing units at an average density of 704.2 per square mile (271.7/km2). The racial makeup of the city was 98.77% White, 0.04% African American, 0.23% Native American, 0.31% Asian, 0.08% Pacific Islander, 0.19% from other races, and 0.38% from two or more races. Hispanic or Latino of any race were 0.50% of the population.
information provided by wikipedia.org