U S Government Offices--u S Postal Service, Post Offices, Wallback Rr 36 Clay, WV 25043 Phone : (304) 587-2700 Business Category Government Offices-Federal Post Offices Government Offices & Public Schools U S Government--post Offices, Wallback State Route 36 Wallback, WV 25285 Phone : (304) 587-2700 Business Category Post Offices Government Offices & Public Schools Post Office - Wallback 6284 Wallback Rd Wallback, WV 25285 Phone : (304) 587-2700 Business Category Post Offices Toll-Free           (800) ASK-USPS