1918 - Flu epidemic. A number of young men from the area are lost in the first World War. 1919 - Dover's charter repealed. 1920 - An inflationary period followed the war. A decline of the railroad tie industry contributes to mass exodus.
Many inhabitants begin a migration to such industrial cities as Granite City, Illinois to find work.
The first class graduated from Dover High School. High school established at Cumberland City, as did high schools at Big Rock and Indian Mound. 1923 - Telephones appeared in the county. 1924 - Dover Furnace reopened by John C. Ralls. Typhoid fever epidemic.