Elko County is a county in the northeastern corner of Nevada, United States. As of the 2020 census, the population was 53,702. Its county seat is Elko. The county was established on March 5, 1869, from Lander County.

Elko is a city in the U.S. state of Nevada and the county seat of Elko County. As of the official 2020 U.S. Census, the city has a population of 20,564. Elko serves as the center of the Ruby Valley, a region with a population of over 55,000. Elko is 21 miles (34 km) from Lamoille Canyon and the Ruby Mountains, providing year-round access to recreation, including hiking, skiing, hunting, and more than 20 alpine lakes. The city straddles the Humboldt River. Spring Creek, Nevada, serves as a bedroom community 6 miles (10 km) from the city with a population of 13,805.