Post Office - Clarksburg 17343 High St Clarksburg, OH 43115 Phone : (740) 993-4494 Post Office - Clarksburg Business Category Post Offices Toll-Free           (800) ASK-USPS United States Government--post Office 17343 High St Clarksburg, OH 43115 Phone : (740) 993-4494 Business Category Government Offices-Federal Post Offices Government Offices & Public Schools