Colfax is a city in Richland County, North Dakota, United States.

According to the United States Census Bureau, the city has a total area of 1.01 square miles (2.62 km2), all land.

There were 48 housing units at an average density of 47.1 per square mile (18.2/km2).

19.6% of all households were made up of individuals, and 10.9% had someone living alone who was 65 years of age or older.

There were 44 housing units at an average density of 49.6 per square mile (19.2/km2).

27.5% of all households were made up of individuals, and 22.5% had someone living alone who was 65 years of age or older.

There were no families and 7.0% of the population living below the poverty line, including no under eighteens and 12.5% of those over 64.