Mayville is a village in Chautauqua County, New York, United States. The population was 1,477 at the 2020 census, 13.7% less than in the 2010 census. Mayville is in the town of Chautauqua and is the county seat of Chautauqua County. The village and town offices share a building on Main Street, directly across from the Chautauqua County courthouse.