Of 36 counties in the state, Umatilla County ranks eighth by size (3,231 square miles). Umatilla County is in Eastern Oregon. Recent listings of riverfront land and property for sale in Oregon's Umatilla County totals almost 1,000 acres and a combined market value of roughly $700,000. The most common type of land for sale by combined acreage in Umatilla County is residential property. Browse all waterfront property for sale in Umatilla 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! The most common type of land for sale by combined acreage in Umatilla County is residential property.