Voltaire is a city in McHenry County, North Dakota, United States.

[6] According to the United States Census Bureau, the city has a total area of 0.40 square miles (1.04 km2), all land.

There were 22 housing units at an average density of 55.0 per square mile (21.2/km2).

The racial makeup of the city was 95.0% White, 2.5% African American, and 2.5% from two or more races.

There were 21 housing units at an average density of 51.5 per square mile (19.9/km2).

There were 16.7% of families and 13.0% of the population living below the poverty line, including 26.7% of under eighteens and none of those over 64.