Arlington is a city in Fayette County, Iowa, United States.

According to the United States Census Bureau, the city has a total area of 1.05 square miles (2.72 km2), all land.

There were 202 housing units at an average density of 201.3 per square mile (77.7/km2).

There were 212 housing units at an average density of 201.9 per square mile (78.0/km2).

The racial makeup of the city was 98.8% White, 0.7% Native American, 0.2% Asian, and 0.2% from two or more races.

31.4% of all households were made up of individuals, and 16.7% had someone living alone who was 65 years of age or older.

There were 230 housing units at an average density of 219.4 per square mile (84.7/km2).

The racial makeup of the city was 99.39% White, 0.41% Native American and 0.20% Asian.

30.2% of all households were made up of individuals, and 17.5% had someone living alone who was 65 years of age or older.