Arcanum (/ɑːrˈkænəm/ ar-CAN-əm[5]) is a village in Darke County, Ohio, United States.

[6] The Greenville and Miami railroad arrived to Arcanum in 1852, connecting it to Dayton and much of the outside world.

Arcanum received its name in November 1848 when two engineers were given the task by John Gunder.

Between the first requirement and the dark, foggy November weather, the men chose "Arcanum," which conveniently means "secret, hidden.

[8] According to the United States Census Bureau, the village has a total area of 1.30 square miles (3.37 km2), all land.

28.0% of all households were made up of individuals, and 13.2% had someone living alone who was 65 years of age or older.

The racial makeup of the village was 98.75% White, 0.05% Native American, 0.19% Asian, and 1.01% from two or more races.

The Village Administrator oversees all of the operations of the Arcanum utilities, as well as anything about the water and sewer systems.