Sunnyside is an unincorporated

Unincorporated area

In law, an unincorporated area is a region of land that is not a part of any municipality.To "incorporate" in this context means to form a municipal corporation, a city, town, or village with its own government. An unincorporated community is usually not subject to or taxed by a municipal government...

 community in Umatilla County

Umatilla County, Oregon

Umatilla County is a county located in the U.S. state of Oregon. It is included in the 8 county definition of Eastern Oregon. The county is named for the Umatilla River. In 2010, its population was 75,889...

, Oregon

Oregon

Oregon is a state in the Pacific Northwest region of the United States. It is located on the Pacific coast, with Washington to the north, California to the south, Nevada on the southeast and Idaho to the east. The Columbia and Snake rivers delineate much of Oregon's northern and eastern...

, United States. It is located about three miles north of Milton-Freewater

Milton-Freewater, Oregon

Milton-Freewater is a city in Umatilla County, Oregon, United States. The city received its current name in 1951 when the neighboring rival cities of Milton and Freewater voted to merge. The population was 6,470 at the 2000 census...

, at the intersection of Oregon Route 332

Oregon Route 332

Oregon Route 332 is an Oregon state highway running from the Washington state line near Umapine to OR 11 near Milton-Freewater. OR 332 is known as the Sunnyside-Umapine Highway No. 332...

, which is also known as the Sunnyside-Umapine

Umapine, Oregon

Umapine is an unincorporated community in Umatilla County, Oregon, United States, two miles from the Oregon-Washington border. It has a population of approximately 300 people. The community is part of the Pendleton–Hermiston Micropolitan Statistical Area...

 Highway, and Oregon Route 339

Oregon Route 339

Oregon Route 339 is an Oregon state highway running from the Washington state line near Ferndale to OR 11 in Milton-Freewater. OR 339 is known as the Freewater Highway No. 339...

. Sunnyside was once a station on the Walla Walla Valley Railway, which served the local fruit orchards, and the site of a Nebraska Bridge Supply and Lumber Co. planing mill

Planing mill

A planing mill is a facility that takes cut and seasoned boards from a sawmill and turns them into finished dimensional lumber. Machines used in the mill include the planer and matcher, the molding machines, and varieties of saws...

 from 1958-1963. There was also an Inland Fir Company sawmill

Sawmill

A sawmill is a facility where logs are cut into boards.-Sawmill process:A sawmill's basic operation is much like those of hundreds of years ago; a log enters on one end and dimensional lumber exits on the other end....

.