Yerington is a city in Lyon County, Nevada, United States. The population was 3,048 at the 2010 census. It is named after Henry M. Yerington, Superintendent of the Virginia and Truckee Railroad from 1868 to 1910. It is the current county seat of Lyon County, the first county seat being established at Dayton on November 29, 1861. After the Dayton Court House burned down in 1909, the seat was moved to Yerington in 1911.