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|• Total||5.46 sq mi (14.1 km2)|
|• Land||5.32 sq mi (13.8 km2)|
|• Water||0.14 sq mi (0.4 km2)|
|Time zone||UTC-8 (Pacific (PST))|
|• Summer (DST)||UTC-7 (PDT)|
Alderton is a census-designated place (CDP) in Pierce County, Washington, United States. The population was 2,893 at the 2010 census. The community is located in the Puyallup River Valley between the cities of Sumner and Orting.
Alderton is located at (47.169444, -122.229167).
According to the United States Census Bureau, the CDP has a total area of 5.46 square miles (8.4 km2), of which, 5.32 square miles (8.3 km2) of it is land and 0.14 square miles (0.08 km2) of it (2.55%) is water.
In February 2015, the Tacoma News Tribune reported two families, Sidhu and Alderton LLC, purchased 116 acres of Alderton farmland located near the Puyallup River and Ball Creek. While Alderton LLC grows mostly Christmas trees, Sidhu grows fruits and vegetables.