Fallon is a city in Churchill County, Nevada, United States. The population was 8,606 at time of the 2010 census. Fallon is the county seat of Churchill County and is located in the Lahontan Valley.Fallon and Churchill County are mostly agricultural areas. Although the area is arid, approximately 50,000 acres of its pastureland are irrigated with water from the Truckee–Carson Irrigation District. The principal crop grown is alfalfa for livestock feed. The "Heart O' Gold" cantaloupes of Churchill County were once distributed across the United States, but are now grown mostly for consumption in Nevada.The largest single employer in Fallon and Churchill County is Naval Air Station Fallon, a training airfield that has been the home of the U.S. Navy's Naval Strike and Air Warfare Center including the TOPGUN training program since 1996, when it was moved here from Naval Air Station Miramar with that Air Station transferred to the U.S. Marine Corps.U.S.