The county was named for the Clatsop tribe of Native Americans, who lived along the coast of the Pacific Ocean prior to European settlement. As of 2000, the population is 35,630. According to the U.S. Census Bureau, the county has a total area of 2,809 km² (1,085 mi²). 2,143 km² (827 mi²) of it is land and 667 km² (258 mi²) of it is water. The total area is 23.74% water.
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