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ClarkCounty is a county located in the southwestern part of the state of Washington, across the Columbia River from Portland, Oregon.
ClarkCounty was one of the first two counties of Washington, named after William Clark of the Lewis and Clark Expedition of the early 1800s.
In the county, the population is spread out with 28.70% under the age of 18, 8.40% from 18 to 24, 30.80% from 25 to 44, 22.60% from 45 to 64, and 9.50% who are 65 years of age or older.