Deeth is an unincorporated community and census-designated place near the intersection of Interstate 80 and Nevada State Route 230 in Elko County, Nevada, United States. When the Central Pacific started running past this site in 1869, a branch line station with telegraph was established. In 1875, a post office was established for nearby ranches and farms. …Deeth is an unincorporated community and census-designated place near the intersection of Interstate 80 and Nevada State Route 230 in Elko County, Nevada, United States. When the Central Pacific started running past this site in 1869, a branch line station with telegraph was established. In 1875, a post office was established for nearby ranches and farms. The community was named after a pioneer citizen.