Hillsboro is a county seat of Washington County, in the Portland-Vancouver metro area. The city was named after settler, David Hill. Hillsboro covers a total area of 55.9 km² (21.6 mi²), all of which is land.

Hillsboro is located in the Tualatin Valley, and the Tualatin River forms part of the southern city limits. Hillsboro has a pleasant climate with an average high of 62.4 degrees F and an average low of 41.3 degrees F.

Elevation: 150 feet

Land area: 22.8 sq. miles.

Latitude: 45.52 N

Longitude: 122.94 W

Population: 84,533 as on 2005

Local festivals include:

Washington County Fair - July 27-30, 2006

Attractions:

• Rice Northwest Museum of Rocks and Minerals