Duvall is a city in King County, Washington, United States, located on SR 203 halfway between Monroe and Carnation. The population was 8,0…Duvall is a city in King County, Washington, United States, located on SR 203 halfway between Monroe and Carnation. The population was 8,034 at the 2020 census. The area that became known as Duvall was historically the home of the Snoqualmie and other ancestral Tulalip Native American tribes. Following their relocation under the Treaty of Point Elliott, the area was homesteaded by veterans of the Civil War. The center of present-day town was located on a hillside homesteaded by Francis and James Duvall, loggers who arrived in 1871.
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