Post Office - Carbon Hill 41769 Hawk St Carbon Hill, OH 43111 Phone : (740) 753-3003 Business Category Post Offices Toll-Free           (800) ASK-USPS Fax           (740) 753-2670 United States Government--post Ofc, Carbon Hill 41769 Hawk St Nelsonville, OH 45764 Phone : (740) 753-3003 Business Category Government Offices-Federal Government Offices & Public Schools