O'Brien, Washington was a former community, north of

Kent Kent is a Ceremonial counties of England, ceremonial county in South East England. It is bordered by Essex across the Thames Estuary to the north, the Strait of Dover to the south-east, East Sussex to the south-west, Surrey to the west, and Gr ...

in the Green River Valley of

King County King County is a county located in the U.S. state of Washington. The population was 2,269,675 in the 2020 census, making it the most populous county in Washington, and the 12th-most populous in the United States. The county seat is Seattle ...

in the U.S. state of

Washington Washington most commonly refers to: * George Washington (1732–1799), the first president of the United States * Washington (state), a state in the Pacific Northwest of the United States * Washington, D.C., the capital of the United States ** A ...

. It was just north of today's Green River Natural Resources Area, on the right bank of the river. At one time, it had a post office and a school. The community was named after Terrance O'Brien, the original owner of the town site.

Notes

Ghost towns in King County, Washington Ghost towns in Washington (state) Geography of Kent, Washington {{Ghost-town-stub