U S Government--post Offices, Clay Main Clay, WV 25043 Phone : (304) 587-4239 Business Category Post Offices Government Offices & Public Schools Post Office - Clay 54 Main St Clay, WV 25043 Phone : (304) 587-4239 Post Office - Clay Business Category Government Offices-Federal Post Offices Government Offices & Public Schools Toll-Free           (800) ASK-USPS