U S Government--skamokawa Steamboat Slough & S Skamokawa, WA 98647 Phone : (360) 795-8731 Business Category Government Offices & Public Schools U.s. Government--u.s. Postal Service, Post Offices, Skamokawa 1391 W Sr4 Cathlamet, WA 98612 Phone : (360) 795-8731 Business Category Government Offices-Federal Post Offices Government Offices & Public Schools Post Office - Skamokawa 1391 W State Road 4 Skamokawa, WA 98647 Phone : (360) 795-8731 Business Category Post Offices Toll-Free           (800) ASK-USPS