Defunct counties Bullfrog County, Nevada, formed in 1987 from part of Nye county. Creation was declared unconstitutional and abolished in 1989. Lake County, Nevada, one of the original nine counties formed in 1861. Renamed Roop County in 1862. Part became Lassen County, California in 1864. Nevada remainder annexed in 1883 to Washoe county. Ormsby County, Nevada, one of the original nine counties formed in 1861. Consolidated in 1969 with the county seat, Carson City, forming the independent city of that name.
Defunct counties Bullfrog County, Nevada, formed in 1987 from part of Nye county. Creation was declared unconstitutional and abolished in 1989. Lake County, Nevada, one of the original nine counties formed in 1861. Renamed Roop County in 1862. Part became Lassen County, California in 1864. Nevada remainder annexed in 1883 to Washoe county. Ormsby County, Nevada, one of the original nine counties formed in 1861. Consolidated in 1969 with the county seat, Carson City, forming the independent city of that name.