The Western Interstate Region is affiliated with the National Association of Counties and is dedicated to the promotion of Western interests within NACo. These interests include public land issues (use and conservation), community stability and economic development, and the promotion of the traditional Western way of life. Its membership consists of fifteen Western states, (Alaska, Hawaii, Wash., Ore., Calif., Idaho, Nev., Ariz., Mont., Wyo., Colo., N.M., Utah, N.D., S.D.) with membership funded through the individual state associations.
The Western Interstate Region (WIR) exists to be the counties' advocate for public policy issues affecting the West.