Federal--post Offices, Silvana 1501 Pioneer Hwy Stanwood, WA 98292 Phone : (360) 652-7154 Business Category Government Offices-Federal Post Offices Government Offices & Public Schools Post Office - Silvana 1501 Pioneer Hwy Silvana, WA 98287 Phone : (360) 652-7154 Post Office - Silvana Business Category Government Offices-Federal Post Offices Government Offices & Public Schools Toll-Free           (800) ASK-USPS