An economic trading region made up of 22 eastern Washington, northern Idaho, and western Montana counties, with Spokane, WA, as the central place, was defined for this study. A 1985 database was used to create an input/output based model of the regional economy. The value of total industry output for the region is $18.1 billion. The region provides $5.4 billion in income to a work force of 286,000. Spokane County, WA, accounts for about 50 pct of total industry output, income, and employment. Both Spokane County and the region as a whole produce about 80 pct of total industry output for final demand, with the remaining 20 pct going to intermediate inputs for further production. Spokane County exports about 43 pct of its total output, while about 35 pct of the regional output is exported. Exports accounted for more than 50 pct of the total output in 18 of the 22 counties within the region.