Demster Zip Code Zip Codes in Demster, New York Zip Code Area Code 13126 315 Get Map Schools in Demster Charles E. Riley Elementary School (K-6) Fitzhugh Park Elementary School (K-6) Kingsford Park Elementary School (K-6) Leighton Elementary School (K-6) Oswego High School (9-12) Oswego Middle School (7-8)

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