There are 2 Post Offices in Allen, South Dakota, serving a population of 470 people in an area of 4 square miles. There is 1 Post Office per 235 people, and 1 Post Office per 1 square miles.
In South Dakota, Allen is ranked 141st of 463 cities in Post Offices per capita, and 264th of 463 cities in Post Offices per square mile.
Find addresses, phone numbers, fax numbers, hours & services for Allen Post Offices.
US Post Office 426 Oglala Loop Allen, SD Postal Services, Shipping Agent
United States Postal Service 426 Oglala Loop Allen, SD Mailing Service, Postal Services