Report prepared by Pyrologix and the USDA Forest Service on the exposure of housing units to wildfire in Oregon and Washington. Two approaches were taken. The first—called an in situ analysis—rates the exposure of housing units where they exist on the landscape. The second approach rates the potential for wildfires originating in one part of the landscape to expose housing units in another. This second approach is often referred to as a wildfire transmission, risk-source, or exposure-source analysis. This report presents results for both approaches. 14 pp.