Arco is a city in Lincoln County, Minnesota, United States.

The request to abandon the line from Tyler, MN to Astoria, SD was approved on February 10, 1970.

45.9% of all households were made up of individuals, and 29.7% had someone living alone who was 65 years of age or older.

The racial makeup of the city was 98.00% White, 1.00% Native American, and 1.00% from two or more races.

31.8% of all households were made up of individuals, and 15.9% had someone living alone who was 65 years of age or older.

There were 6.9% of families and 4.9% of the population living below the poverty line, including no under eighteens and 6.9% of those over 64.