United States Government--post Office Clarksburg, IN 47225 Phone : (812) 527-2004 Business Category Post Offices Government Offices & Public Schools Post Office - Clarksburg 6656 N County Road 700 E Clarksburg, IN 47225 Phone : (812) 527-2004 Post Office - Clarksburg Business Category Post Offices Toll-Free           (800) ASK-USPS