Washington County Post Offices

14135 State Highway C
Belgrade, Missouri 63622

15026 E State Highway 47
Cadet, Missouri 63630

3 Valley Center
Caledonia, Missouri 63631

7682 Old Highway H
Fletcher, Missouri 63030

111 S Hickory St
Irondale, Missouri 63648

102 5th St
Mineral Point, Missouri 63660

103 Laurel St
Potosi, Missouri 63664

11218 State Highway A
Richwoods, Missouri 63071

13528 Tiff Ln
Tiff, Missouri 63674

Washington County

There are 9 US Post Offices in Washington County serving a total of 22,388 residents equating to 2,488 residents per post office. It's estimated that approximately 35,734 packages are handled across the 9 county post offices annually. Washington County is a county located in the eastern portion of the U.S. state of Missouri. As of the 2010 census, the population was 25,195. The largest city and county seat is Potosi. The county was officially organized on August 21, 1813, and was named in honor of George Washington, the first President of the United States."