Main city: Chestnut
Timezone: Central
Phone type: Landline
Operator: Frontier Communications Of Mt. Pulaski

Chestnut, a census-designated place in Aetna Township, Logan County, Illinois. As of the 2010 census, its population was 246. Its claim to fame is that it is the geographic center of the state. A small monument to this effect has been erected in a park near the southwest corner of Melvin Street and East Olive street (in §34 T19N R1W). The community is located northwest across the railroad tracks along Illinois Route 54 at Dauphin Street. ^source

Area code 217 is the North American telephone area code for much of western and central Illinois. The 217 area includes Illinois' capital Springfield, plus Champaign, Urbana, Decatur, Danville, Quincy, and Rantoul. 217 was one of the original area codes, which were created in 1947. ^source