Post Office - Plainville 8000 Plainville Rd Plainville, NY 13137 Phone : (315) 638-8123 Post Office - Plainville Business Category Post Offices Toll-Free           (800) ASK-USPS United States Government--postal Service, Local Area Post Offices, Plainville 8000 Plainville Rd Baldwinsville, NY 13027 Phone : (315) 638-8123 Business Category Government Offices-Federal Post Offices Government Offices & Public Schools