Arthur is an urban settlement in Ida County, Iowa, United States.

[4] According to the United States Census Bureau, the city has a total area of 0.15 square miles (0.39 km2), all land.

There were 111 housing units at an average density of 757.2 per square mile (292.4/km2).

There were 113 housing units at an average density of 753.3 per square mile (290.9/km2).

The racial makeup of the city was 98.1% White, 0.5% African American, and 1.5% from other races.

31.6% of all households were made up of individuals, and 21% had someone living alone who was 65 years of age or older.

There were 117 housing units at an average density of 764.1 per square mile (295.0/km2).

42.9% of all households were made up of individuals, and 29.5% had someone living alone who was 65 years of age or older.

About 4.7% of families and 8.0% of the population were below the poverty line, including 6.7% of those under the age of eighteen and 10.2% of those 65 or over.