SourceThe Only Guide to Washington County Chamber of Commerce - Oregon
9 km2), all of which is land. In 2013, Hillsboro itself reported a location of 23. 88 square miles (61. 8 km2), equivalent to 15,283 acres (61. 8 km2). The city is located in the Tualatin Valley, and the Tualatin River kinds part of the southern city limitations. The city's terrain is relatively level, consistent with a farming p