Post Office - Constantia 45 Redfield St Constantia, NY 13044 Phone : (315) 623-9049 Business Category Post Offices Toll-Free           (800) ASK-USPS United States Government--postal Service, Local Area Post Offices, Constantia Constantia, NY 13044 Phone : (315) 623-9049 Business Category Government Offices-Federal Post Offices Government Offices & Public Schools