Potomac is a village in Vermilion County, Illinois, United States. It is part of the Danville, Illinois Metropolitan Statistical Area. The population was 750 at the 2010 census. The town was originally named Marysville after the wives of the two founders, John Smith and Isaac Meneley, who started businesses here circa 1840. On May 13, 1871, a post office was esta…Potomac is a village in Vermilion County, Illinois, United States. It is part of the Danville, Illinois Metropolitan Statistical Area. The population was 750 at the 2010 census. The town was originally named Marysville after the wives of the two founders, John Smith and Isaac Meneley, who started businesses here circa 1840. On May 13, 1871, a post office was established at the town and was named Potomac, most likely after the Potomac River. The town's name was later changed to conform to this.
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