Willamina is a city in Polk and Yamhill Counties in the U.S. state of Oregon. The population was 1,844 at the 2000 census, with an unofficial estimated population of 1,885 in 2006. The Yamhill County portion of Willamina is part of the Portland–Vancouver–Beaverton, OR-WA Metropolitan Statistical Area, while the Polk County portion is part of the Salem, OR Metropolitan Statistical Area.
As of the census of 2000, there were 1,844 people, 666 households, and 480 families residing in the city. The population density was 2,138.0 people per square mile (827.9/km²). There were 715 housing units at an average density of 829.0 per square mile (321.0/km²). The racial makeup of the city was 84.22% White, 0.16% African American, 9.82% Native American, 0.16% Asian, 0.05% Pacific Islander, 1.84% from other races, and 3.74% from two or more races. Hispanic or Latino of any race were 3.42% of the population.