There are 2 Post Offices in Johnston, Iowa, serving a population of 20,172 people in an area of 18 square miles. There is 1 Post Office per 10,086 people, and 1 Post Office per 8 square miles.
In Iowa, Johnston is ranked 809th of 1056 cities in Post Offices per capita, and 814th of 1056 cities in Post Offices per square mile.
Find addresses, phone numbers, fax numbers, hours & services for Johnston Post Offices.
US Post Office 5440 Northwest 86th Street Johnston, IA Mailing Service, Postal Services
United States Postal Service 5874 Merle Hay Road Johnston, IA Mailing Service, Postal Services