Staunton is the second largest city in Macoupin County, Illinois, United States. As of the 2020 census, the population was 5,054. A settler na…Staunton is the second largest city in Macoupin County, Illinois, United States. As of the 2020 census, the population was 5,054. A settler named Stanton bought land in the area and donated the land to a nearby village. The village decided to name the town Stanton after the original settler. An application for the town's incorporation was sent to Washington DC where it was approved but misspelled as Staunton due to the name being similar to Staunton, Virginia.