| Conventional Long Name: | Ormsby County |
| Subdivision: | County |
| Nation: | Nevada |
| Capital: | Carson City |
| Year Start: | 1861 |
| Year End: | 1969 |
| Date Start: | November 25, |
| Event End: | Merged |
| Date End: | April 1, |
| Stat Year1: | 1870 |
| Stat Pop1: | 3,668 |
| Membership Title1: | Country |
| Membership1: | United States |
| Membership Title2: | Territory |
| Membership2: | Nevada Territory (1861–1864) |
| Membership Title3: | State |
| Membership3: | Nevada (1864–1969) |
| S1: | Carson City, NevadaCarson City |
| Border S1: | no |
| Stat Year2: | 1960 |
| Stat Pop2: | 8,063 |
| Image Map Caption: | 1861 map of Nevada Territory, with Ormsby County highlighted |
Ormsby County was a county in Nevada Territory from 1861 to 1864 and in the State of Nevada from 1864 until 1969. It contained Carson City, the county seat, and later, the state capital, founded two years earlier.
It was named after Major William Ormsby, one of the original settlers of Carson City, killed along with seventy-five other men in 1860, in an unsuccessful attempt to subdue a perceived uprising of Paiute people near Pyramid Lake, Nevada, which was at the time part of Utah Territory.[1]
Ormsby County was established in 1861 with creation of Nevada Territory. The county's population dwindled significantly after the gold rush days. By the late 1940s, it was little more than Carson City and a few surrounding hamlets to the west. By the 1960 census, all but 2,900 of the county's 8,300 residents lived in Carson City. Discussions began about merging Carson City with Ormsby County after World War II. However, the effort never got beyond the planning stages until 1966, when a statewide referendum formally approved the merger. The required constitutional amendment was passed in 1968. On April 1, 1969, Ormsby County and Carson City officially merged as the Consolidated Municipality of Carson City.[2]