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Washington County


Facts & Information

The Cities and communities of Washington County, Idaho *


Cambridge, Concrete, Crystal






Midvale, Mineral



Weiser (County Seat)


*This list of cities may not be complete. The list may contain towns, cities, villages, boroughs, neighborhoods, townships, ghost towns and other populated places.

If you have information about any of these unlinked communities, please send it to us and we will add a page for that community. Some of these places above may only be neighborhoods or local area names and are not listed with the census at all or just included in a larger surrounding designated census area..

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Information & Facts about Washington County, Idaho


Washington County official website

Washington County offices
256 East Court
Weiser, ID 83672
Phone: (208)414-2789
Fax: (208)414-3925


2000 - 9,977
1997 - 10,090
1990 - 8,550
1980 -
1970 - 7,633

Population Density:
2000 - 7.0 persons per square mile
1997 - 6.9 persons per square mile
1990 - 5.9 persons per square mile
1980 - 6.1 persons per square mile
1970 - 5.2 persons per square mile


Washington County is in western Idaho next to the Oregon border. To the north is Adams County and to the east is Valley County. To the south are both Gem and Payette Counties.


The climate is moderate with cold winters and warm summers.
Average Winter temperature: 27.7
Average Spring temperature: 52.2
Average Summer temperature: 75.6
Average Fall temperature: 52.1

Average yearly snowfall: 22.0 inches (for Weiser)

Other Facts & Figures:

Median age - 39.2 years

Median income -
$35,542 (family)
Per capita - $15,464

Housing Units:
2000 - 4,138


Washington County was formed on 20 February 1879, carved out from southwest Idaho County and northern Ada County. It was named for George Washington, the first president of the United States. Weiser Bridge (now simply Weiser) was named the first county seat. Adams County was created in 1911 from northern Washington County.

Wilson Price Hunt and McDonald McKenzie came here in 1811 as the first white men to venture through the area. They returned in 1818 with trappers to catch Beaver in the Weiser River. The route taken by Hunt later was known as the Oregon Trail. A ferry began operation in 1863, run by R.P. Olds. The ferry was located about ten miles below the mouth of the Weiser River and was known as Oldsferry. Forts were built in this general area and by 1866, steamboats began to operate along the Snake River. The Oregon Short Line railroad arrived in 1884 and in 1899, the P&IN also came, bringing with them more people, supplies and the ability to transport goods and produce more effectively.

Try this history page for more information about Washington County
Ghost Towns of Washington County
Washington County History


Total area: 1,474 square miles (20th in size in the state)
Land area: 1,456 square miles
Water area: 17 square miles (1.17% water)

Longitude: 116.58
Latitude: 44.15


Family History Center in Washington County
Weiser Idaho
300 E Main Street
Weiser, Washington County, Idaho, United States
Phone: (208) 549-1575

US GenWeb page for Washington County

Kindred page for Washington County

Cemeteries of Washington County
Political Graveyard for Washington County


Cambridge Community Library
120 Superior Street
Cambridge, Idaho
Phone: (208) 257-3434

Midvale Idaho Community Library
70 E Bridge Street
PO Box 127
Midvale, Idaho 83645
Phone: (208) 355-2213

Weiser Public Library
628 E 1st Street
Weiser, Idaho
Phone: (208) 549-1243


Cambridge Joint School District 432
Highway 71
Cambridge, ID 83610

Midvale School District 433
56 School Road
Midvale, ID 83645

Weiser Schools

Organizations & Groups:

the Greater Weiser Area Chamber of Commerce
309 State Street
Weiser, Idaho 83672
Phone: 208-414-0452
Fax: 208-414-0255

Attractions & Other Information:

National Ole' Time Fiddlers Contest
This contest is held every year during the third full week of June and is well-known for the best Fiddle music in the country.

Weiser Valley Round-Up & Rodeo
held each year the 2nd week of June.

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This page was last updated on 1 May 2009 at 11:55 am

This page was created on 17 February 2005

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