The Sumas Post Office is located in the state of Washington within Whatcom County. This location serves 2,409 Sumas residents with a median income of $61,500. It's estimated that approximately 3,845 packages pass through this post office each year.
The Sumas Post Office is located in the state of Washington within Whatcom County. This location serves 2,409 Sumas residents with a median income of $61,500. It's estimated that approximately 3,845 packages pass through this post office each year.