Williamson is a census-designated place (CDP) in Yavapai County, Arizona, United States. The population was 3,776 at the 2000 census. The name “Wiliamson” is a misnomer, perhaps propagated by federal bureaucratic error; the area has long been known as “Williamson Valley” after the major road through the area, Williamson Valley Road.
Williamson is located at 34°40′28″N 112°31′50″W (34.674552, -112.530445).
According to the United States Census Bureau, the CDP has a total area of 57.6 square miles (149 km2), all of it land.
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