premise: Sidney is a town in Kennebec County, Maine, United States. The population was 4,208 at the 2010 census. Sidney was incorporated as a town on January 30, 1792. The town was named for Sir Philip Sidney, an English author. Sidney is included in the Augusta, Maine micropolitan New England City and Town Area. Since 1937, the town is the home of the New England Music Camp.
hypothesis: The town had a census in the 21st century.
reason: The term 21st century was not in any of the information given explicitly but it did have a census in 2010 which is a date in the 21st century.