Lake Sidney Lanier - US Army Corps of Engineers

sidneySchool in Session Monday, May 19. Last Day of School May 21, Early Dismissal @ 11:15 am. Search for: Sidney Community School District.Sidney is a town in Delaware County, New York, United States. The population was 5,536 at the 2020 census. [3] [4] The town is at the northwestern corner of the county and contains