Cornelius is a city in Washington County, Oregon, United States. Located in the Portland metropolitan area, the city's population was 11,869 at the 2010 census. The city lies along Tualatin Valley Highway between Forest Grove to the west and Hillsboro to the east. Cornelius was incorporated in 1893 and is named for founder Thomas R. Cornelius.
According to the United States Census Bureau, the city has a total area of 2.01 square miles (5.21 km²), all land.
As of the census of 2010, there were 11,869 people, 3,339 households, and 2,666 families residing in the city. The population density was 5,905.0 inhabitants per square mile (2,279.9/km²). There were 3,499 housing units at an average density of 1,740.8 per square mile (672.1/km²). The racial makeup of the city was 64.0% White, 1.2% African American, 1.3% Native American, 2.2% Asian, 0.1% Pacific Islander, 27.2% from other races, and 4.0% from two or more races. Hispanic or Latino of any race were 50.1% of the population.
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