Multnomah County is in Portland Metro Oregon. Of the 36 counties in the state, Multnomah County is 36th in terms of its size (297,708 acres). The most common type of land for sale by combined acreage in Multnomah County is residential property. Browse all waterfront property for sale in Multnomah County on the Land Network to find the marina, lakefront and other recreational property that meets your needs, from waterside land perfect as a retirement investment to existing residential waterfront land and property for hunting, fishing and other outdoor-recreation pursuits!