There are 2 Post Offices in St. Marys, Pennsylvania, serving a population of 12,603 people in an area of 100 square miles. There is 1 Post Office per 6,301 people, and 1 Post Office per 49 square miles.
In Pennsylvania, St. Marys is ranked 1,429th of 2580 cities in Post Offices per capita, and 1,515th of 2580 cities in Post Offices per square mile.
Find addresses, phone numbers, fax numbers, hours & services for St. Marys Post Offices.
US Post Office 201 Chestnut Street St. Marys, PA
United States Postal Service 201 Chestnut Street St. Marys, PA Mailing Service, Postal Services