Holbrook 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 Multnomah County

Multnomah County, Oregon

Multnomah County is one of 36 counties in the U.S. state of Oregon. Though smallest in area, it is the most populous as its county seat, Portland, is the state's largest city...

, 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 on U.S. Route 30 about 15 miles northwest of Portland

Portland, Oregon

Portland is a city located in the Pacific Northwest, near the confluence of the Willamette and Columbia rivers in the U.S. state of Oregon. As of the 2010 Census, it had a population of 583,776, making it the 29th most populous city in the United States...

 between the Tualatin Mountains

Tualatin Mountains

The Tualatin Mountains are a range of hills on the western border of Multnomah County, Oregon, United States...

 and the Multnomah Channel

Multnomah Channel

Multnomah Channel is a distributary of the Willamette River that splits from the main stem a few miles upstream of the Willamette's convergence with the Columbia River in Multnomah County in the U.S. state of Oregon. The channel flows northwest then north around Sauvie Island for about to meet the...

 south of Sauvie Island

Sauvie Island

Sauvie Island, in the U.S. state of Oregon, originally Wapato Island or Wappatoo Island, is the largest island along the Columbia River, at 26,000 acres , and the largest river island in the United States...

. Holbrook's elevation is 135 feet above sea level

The community was named for pioneer

American pioneer

American pioneers are any of the people in American history who migrated west to join in settling and developing new areas. The term especially refers to those who were going to settle any territory which had previously not been settled or developed by European or American society, although the...

Philo Holbrook, who owned a farm nearby. Holbrook post office ran from 1887 to 1933.