Contact Us Town of Hammond, St. Lawrence County, New York PO Box 219, 21 S Main St. Hammond, NY 13646 Phone: (315) 324-5321 Fax: (315) 324-5302 Office Hours Mon: 9:00 am - 3:00 pm Tues - Thurs: 9:30 am - 3:00 pm Fill out form.