Altmar-parish-williamstown Central School Parish, NY 13131 Phone : (315) 625-5200 Business Category Schools Government Offices & Public Schools Altmar-parish-williamstown Central School District--altmar Middle School 640 County Route 22 Parish, NY 13131 Phone : (315) 625-5200 Business Category Schools Administration Of Educational Programs Schools-Junior High Schools-Public Government Offices & Public Schools