Arthur is a city in Cass County, North Dakota, United States.

[3] According to the United States Census Bureau, the city has a total area of 1.52 square miles (3.94 km2), all land.

There were 144 housing units at an average density of 94.7 per square mile (36.6/km2).

34.6% of all households were made up of individuals, and 18.5% had someone living alone who was 65 years of age or older.

The top six ancestry groups in the city are German (49.3%), Norwegian (32.8%), Swedish (13.9%), Irish (10.7%), English (8.7%), French (6.0%).

32.6% of all households were made up of individuals, and 17.8% had someone living alone who was 65 years of age or older.