Miller City is a village in Putnam County, Ohio, United States.

[6] According to the United States Census Bureau, the village has a total area of 0.30 square miles (0.78 km2), all land.

There were 66 housing units at an average density of 220.0 per square mile (84.9/km2).

27.9% of all households were made up of individuals, and 13.1% had someone living alone who was 65 years of age or older.

25.5% of all households were made up of individuals, and 11.8% had someone living alone who was 65 years of age or older.

There were no families and 1.0% of the population living below the poverty line, including no under eighteens and none of those over 64.