O'Brien, Washington

{{Short description|Ghost town in Washington (state)}}

{{Use American English|date=June 2025}}

{{Use mdy dates|date=July 2023}}

{{Infobox settlement

|official_name = O'Brien, Washington

|settlement_type = Ghost town

|nickname =

|motto =

|image_skyline = White_River_flood_at_O'Brien,_Washington,_ca_1906_(MOHAI_7340).jpg

|imagesize =

|image_caption = Flood in O'Brien (1906)

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|pushpin_map = Washington#USA

|pushpin_label = O'Brien

|subdivision_type = Country

|subdivision_name = United States

|subdivision_type1 = State

|subdivision_name1 = Washington

|subdivision_type2 = County

|subdivision_name2 = King

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|timezone = Pacific (PST)

|utc_offset = -8

|timezone_DST = PDT

|utc_offset_DST = -7

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|coordinates = {{coord|47|24|44|N|122|14|13|W|type:city_region:US-WA_source:GNIS-enwiki|display=inline,title}}

|postal_code_type = ZIP code

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|blank1_name = GNIS feature ID

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}}

O'Brien, Washington was a former community, north of Kent in the Green River Valley of King County in the U.S. state of Washington. 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 Green-Duwamish River: Connecting people with a diverse environment. Duwamish River Cleanup Coalition/TAG. No date, appears to be 2008 or 2009.

The community was named after Terrance O'Brien, the original owner of the town site.{{cite book|last=Meany|first=Edmond S.|title=Origin of Washington geographic names|url=https://babel.hathitrust.org/cgi/pt?id=mdp.39015027074981;view=1up;seq=210|year=1923|publisher=University of Washington Press|location=Seattle|page=194}}