Divernon is a village in Sangamon County, Illinois, United States. The population was 1,139 at the 2020 census. It is part of the Springfield, Illinois Metropolitan Statistical Area. A post office has been in operation at Divernon since 1887. The village took its name after Di Vernon, a character in the novel Rob Roy. A history of the village's first 75 year…Divernon is a village in Sangamon County, Illinois, United States. The population was 1,139 at the 2020 census. It is part of the Springfield, Illinois Metropolitan Statistical Area. A post office has been in operation at Divernon since 1887. The village took its name after Di Vernon, a character in the novel Rob Roy. A history of the village's first 75 years was compiled in 1975, titled "Village of Divernon Diamond Jubilee Memory Book."