Mercer County--delaware Township, Township Building 53 Oniontown Rd Greenville, PA 16125 Phone : (724) 588-2040 Business Category Government Offices-City Village & Twp Government Offices State & Local Government Offices & Public Schools Delaware Twp Supervisor 53 Oniontown Rd Greenville, PA 16125 Phone : (724) 588-2040 Business Category Government Offices-City Village & Twp Legislative Bodies