United States Government--postal Service, Institute Zip Code Institute, WV 25112 Phone : (304) 768-8911 Business Category Government Offices & Public Schools Post Office - Institute 6200 Fairlawn Ave Institute, WV 25112 Phone : (304) 768-8911 Business Category Post Offices Toll-Free           (800) ASK-USPS United States Government--postal Service, Other Area Post Offices, Institute Dunbar, WV 25064 Phone : (304) 768-8911 Business Category Post Offices Government Offices & Public Schools