State Route 535 (SR 535) is the Nevada Department of Transportation (NDOT) designation for two discontinuous sections of Idaho Street just west of and within the small city of Elko in the northeastern part of the U.S. state of Nevada. Both segments are also signed as Interstate 80 Business, which is also signed along the city-maintained segment of Idaho Street between the two NDOT segments as well as the city-maintained segment of Idaho Street east of the final eastern terminus all the way to East Jennings Way, from which it connects to the Elko East exit on Interstate 80. Most of Interstate 80 Business in Elko, including both segments of SR 535, were formerly designated U.S. Route 40.

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.