There are 6 Post Offices in Columbia County, Washington, serving a population of 3,999 people in an area of 869 square miles. There is 1 Post Office per 666 people, and 1 Post Office per 144 square miles.
In Washington, Columbia County is ranked 1st of 39 counties in Post Offices per capita, and 26th of 39 counties in Post Offices per square mile.
Find addresses, phone numbers, fax numbers, hours & services for Columbia County Post Offices.
US Post Office 54-64 South 11th Street Pomeroy, WA Postal Services, Shipping Agent
United States Postal Service 202 South 2nd Street Dayton, WA Mailing Service, Postal Services
United States Postal Service 219 South Main Street LaCrosse, WA Mailing Service, Postal Services
United States Postal Service 224 Main Street Waitsburg, WA Mailing Service, Postal Services
United States Postal Service 1076 Main Street Pomeroy, WA Mailbox Rental, Mailing Service, Postal Services
United States Postal Service 301 Main Street Starbuck, WA Mailing Service, Postal Services