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==Geography== According to the [[United States Census Bureau]], the county has a total area of {{convert|726|sqmi}}, of which {{convert|724|sqmi}} is land and {{convert|2.2|sqmi}} (0.3%) is water.<ref>{{Cite web |date=August 22, 2012 |title=2010 Census Gazetteer Files |url=http://www2.census.gov/geo/docs/maps-data/data/gazetteer/counties_list_41.txt |access-date=February 28, 2015 |publisher=United States Census Bureau}}</ref> It is located approximately {{convert|20|mi|km}} to the west of [[Portland, Oregon|Portland]]. The [[Metro (Oregon regional government)|Portland Metro]] [[Urban Growth Boundary]] (UGB) bisects the county. The county's highest point is [[South Saddle Mountain]] at {{convert|3,464|ft|m}} above [[sea level]] in the [[Northern Oregon Coast Range]].<ref>{{Cite web |title=South Saddle Mountain - Peakbagger.com |url=http://www.peakbagger.com/peak.aspx?pid=1076 |url-status=dead |archive-url=https://web.archive.org/web/20180401144714/http://www.peakbagger.com/peak.aspx?pid=1076 |archive-date=April 1, 2018 |access-date=April 1, 2018 |website=www.peakbagger.com}}</ref> Most of the county is in the [[Tualatin Valley]], formed by the [[Tualatin Mountains]] to the east and north, the [[Chehalem Mountains]] to the south, and the Northern Oregon Coast Range to the west and north. The [[Tualatin River]], located almost entirely within the county, flows through the [[Tualatin Plains]]. The northern and western portions of the county are forested, while the remainder of the county includes urban areas, agricultural lands, and floodplains.<ref>{{Cite web |title="Washington County OR" (Google Maps - accessed October 19, 2019) |url=https://www.google.com/maps/place/Washington+County,+OR/@45.5571073,-123.2417868,49875m/data=!3m1!1e3!4m5!3m4!1s0x549567c85afdc2e7:0x33f5aee1971bf62b!8m2!3d45.5469616!4d-123.1386021}}</ref> ===Waterways=== The Tualatin River is the main river in Washington County. [[Henry Hagg Lake]], southwest of Forest Grove, is the largest lake. The Willamette River lies to the east, the Columbia River to the northeast, and the Pacific Ocean to the west of the county. ===Adjacent counties=== [[File:Washington County.svg|thumb|Map of Washington County]] {{Div col|colwidth=30em}} * [[Clatsop County, Oregon|Clatsop County]] - northwest * [[Columbia County, Oregon|Columbia County]] - north * [[Multnomah County, Oregon|Multnomah County]] - east * [[Clackamas County, Oregon|Clackamas County]] - southeast * [[Yamhill County, Oregon|Yamhill County]] - south * [[Tillamook County, Oregon|Tillamook County]] - west {{div col end}} ===Major highways=== {{Div col|colwidth=30em}} * [[File:I-5.svg|20px]] [[Interstate 5 (Oregon)|Interstate 5]] (freeway) * [[File:I-205.svg|25px]] [[Interstate 205 (Oregon)|Interstate 205]] (freeway) * [[File:US 26.svg|20px]] [[U.S. Route 26 (Oregon)|U.S. Route 26]] (freeway for part) * [[File:OR 6.svg|20px]] [[Oregon Route 6]] * [[File:OR 8.svg|20px]] [[Oregon Route 8]] * [[File:OR 10.svg|20px]] [[Oregon Route 10]] * [[File:OR 47.svg|20px]] [[Oregon Route 47]] * [[File:OR 99W.svg|25px]] [[Oregon Route 99W]] * [[File:OR 210.svg|25px]] [[Oregon Route 210]] * [[File:OR 217.svg|25px]] [[Oregon Route 217]] (freeway) * [[File:OR 219.svg|25px]] [[Oregon Route 219]] {{div col end}} ===National protected areas=== * [[Tualatin River National Wildlife Refuge]] (part) === Aviation === {{See also|Category:Airports in Washington County, Oregon|category=yes}} * [[Apple Valley Airport (Oregon)|Apple Valley Airport]] * [[Bernard's Airport]] * [[Hillsboro Airport]] * [[Skyport Airport]] * [[Stark's Twin Oaks Airpark]] * [[Sunset Air Strip]]
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