Expand your research by checking out the Nevada Online Historical Newspapers here.
Tax lists linked here are not true directories, but do list many residents and are a nice substitute in their absence.
Carson City and Reno City and Washoe County Directories, Polk, 1920-1 - Free (DistantCousin)
Carson City, Reno, and Sparks City and Washoe County Directories, Polk, 1921 - Free (Don's List)
Washoe County Tax List, 1936 - Free (DistantCousin)