Of 36 counties in the Union State, Umatilla County is eighth in terms of its size (3,231 square miles). Umatilla County is in Eastern Oregon. There is almost 1,000 acres of riverfront property for sale in Umatilla County, Oregon, based on recent Land Network data. The combined market value of farms and ranches for sale here is $900,000. 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.