Fernley is a city in Lyon County, Nevada, United States, and part of the Reno–Tahoe-Sparks metropolitan area CSA. The city was incorporat…Fernley is a city in Lyon County, Nevada, United States, and part of the Reno–Tahoe-Sparks metropolitan area CSA. The city was incorporated in 2001. The population of the city was 22,895 at the 2020 census, making it the 7th most populous city in Nevada.