Washington County Maps: Interactive History & Complete List

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Map of Washington Counties
Map of Washington county boundaries and county seats

Maps of Washington are generally an important element of genealogy and family history research projects, notably in case you live far from where your ancestor resided. Since Washington’s political borders often changed, historic maps are significant in helping you find out the exact, specific location of your ancestor’s hometown, what land they owned, just who his or her neighbors happen to be, what the boundaries of their areas were, and a lot more.

Maps of Washington State are generally an excellent source for getting started with your own research, given that they provide substantially valuable information and give you facts quickly in a clearly presented and organized form. Maps of Washington are a major resource containing considerable amounts of rich detail regarding family history.

Washington borders Idaho, Oregon, and Canada. Washington’s 10 largest cities are Seattle, Spokane, Tacoma, Vancouver, Bellevue, Everett, Kent, Yakima, Renton, and Spokane Valley.

Learn more fascinating historical facts about Washington Counties here.

Interactive Map of Washington County Formation History

AniMap Plus 3.0, with the Permission of the Goldbug Company


List of Every Washington County

Adams County

Established in 1883, Adams County has a population of approximately 19,000 residents. It is known for its agricultural industry and is home to the Othello Sand Dunes, a popular recreation area.

Asotin County

Asotin County was established in 1883 and has a population of around 23,000 people. It is located in the southeast corner of the state and is known for its outdoor recreation opportunities, including fishing and hiking.

Benton County

With a population of over 200,000 residents, Benton County was established in 1905 and is located in south-central Washington. Here, you can find the Hanford Site, a former nuclear production facility.

Chelan County

Chelan County was established in 1899 and has a population of around 77,000 people. It is located in central Washington and is known for its natural beauty, including Lake Chelan and the Cascade Mountains.

Clallam County

Established in 1854, Clallam County is situated on the Olympic Peninsula and has a population of around 77,000 residents. It is famous for its scenic coastline and Olympic National Park.

Clark County

With a population of over 500,000 people, Clark County was established in 1845 and is located in southwest Washington. It is home to the city of Vancouver and is a major transportation hub.

Columbia County

Columbia County was established in 1875 and has a population of around 3,900 residents. It can be found in southeast Washington and is known for its agriculture and hunting opportunities.

Cowlitz County

Cowlitz County was founded in 1854 and has a population of around 110,000 people. It is located in southwest Washington and is home to the city of Longview and the Mount St. Helens National Volcanic Monument.

Douglas County

Douglas County was established in 1883 and has a population of around 43,000 residents. It is located in central Washington and is known for its agricultural industry, including apple orchards and vineyards.

Ferry County

With a population of around 7,500 people, Ferry County was established in 1899 and is situated in northeast Washington. It is celebrated for its outdoor recreation opportunities, including fishing and hunting.

Franklin County

Franklin County was established in 1883 and has a population of over 100,000 residents. It can be found in southeast Washington and is famous for its agriculture and the Tri-Cities area.

Garfield County

Garfield County was founded in 1881 and is home to around 2,200 residents. It is located in southeast Washington and is known for its rural character and hunting opportunities.

Grant County

With a population of over 100,000 people, Grant County was established in 1909 and is located in central Washington. It is known for its irrigation system, which allows for agriculture in the arid region.

Grays Harbor County

Grays Harbor County was established in 1854 and has a population of around 73,000 people. It is situated on the coast of Washington and is notable for its fishing industry and coastal scenery.

Island County

Established in 1852, Island County has a population of around 84,000 residents. It is located on Whidbey Island and is known for its naval base and scenic beauty.

Jefferson County

Jefferson County was established in 1852 and has a population of around 32,000 people. It is located on the Olympic Peninsula and is known for its natural beauty and outdoor recreation opportunities.

King County

With a population of over 2 million residents, King County was founded in 1852 and is in western Washington. It is home to the city of Seattle and is the largest county in the state.

Kitsap County

Kitsap County was established in 1857 and is home to around 271,000 people. It is located on the Kitsap Peninsula and is notable for its naval base and scenic beauty.

Kittitas County

Established in 1883, Kittitas County has a population of around 47,000 residents. It can be found in central Washington and is celebrated for its agriculture and outdoor recreation opportunities, including hiking and skiing.

Klickitat County

Klickitat County was established in 1859 and has a population of around 22,000 people. It is located in south-central Washington and is rightly acclaimed for its natural beauty and outdoor recreation opportunities, including windsurfing and fishing.

Lewis County

With a population of around 81,000 people, Lewis County was founded in 1845 and is located in southwest Washington. It is famous for its timber industry and outdoor recreation opportunities, including hiking and camping.

Mason County

Mason County was established in 1854 and has a population of around 67,000 people. It is located on the Olympic Peninsula and is notable for its natural beauty and outdoor recreation opportunities, including boating and fishing.

Okanogan County

With a population of around 42,000 people, Okanogan County was established in 1888 and is situated in north-central Washington. It is known for its agricultural industry and outdoor recreation opportunities, including hiking and fishing.

Pacific County

Pacific County was established in 1851 and has a population of around 22,000 people. It is located on the coast of Washington and is well-known for its fishing industry and scenic beauty.

Pend Oreille County

Pend Oreille County was established in 1911 and is home to around 13,000 residents. It is located in northeast Washington and is celebrated for its outdoor recreation opportunities, including hiking and fishing.

Pierce County

With a population of over 900,000 people, Pierce County was established in 1852 and is located in western Washington. It is home to the city of Tacoma and is famous for its military bases and natural beauty.

San Juan County

Established in 1873, San Juan County has a population of around 17,000 residents. It is located on the San Juan Islands and is known for its natural beauty and tourism industry.

Skagit County

Skagit County was founded in 1883 and has around 130,000 residents. It can be found in northwest Washington and is much-loved for its agriculture and outdoor recreation opportunities, including hiking and boating.

Skamania County

With a population of around 12,000 people, Skamania County was established in 1854 and is situated in southwest Washington. It is acclaimed for its natural beauty and outdoor recreation opportunities, including hiking and fishing.

Snohomish County

Snohomish County was established in 1861 and has over 830,000 residents. It is located in western Washington and is eminent for its aerospace industry and natural beauty.

Spokane County

With a population of over 500,000 people, Spokane County was founded in 1858 and is located in eastern Washington. It is home to the city of Spokane and is famous for its healthcare industry and outdoor recreation opportunities.

Stevens County

Stevens County was established in 1863 and has around 45,000 residents. It is located in northeast Washington and is known for its natural beauty and outdoor recreation opportunities, including hiking and fishing.

Thurston County

Thurston County was established in 1852 and is home to over 290,000 people. It can be found in western Washington and is well-known for its state government offices and natural beauty.

Wahkiakum County

Established in 1854, Wahkiakum County has a population of around 4,000 residents. It is located on the coast of Washington and is celebrated for its fishing industry and rural character.

Walla Walla County

Walla Walla County was established in 1854 and has a population of around 60,000 people. It is located in southeast Washington and is known for its agricultural industry and wine production.

Whatcom County

With around 230,000 residents, Whatcom County was established in 1854 and is situated in northwest Washington. It is known for its natural beauty and outdoor recreation opportunities, including hiking and skiing.

Whitman County

Established in 1871, Whitman County is home to around 50,000 people. It is located in southeast Washington and is much-loved for its agriculture and outdoor recreation opportunities, including hiking and fishing.

Yakima County

With a population of over 250,000 people, Yakima County was established in 1865 and is located in central Washington. It is known for its agriculture industry and outdoor recreation opportunities, including hiking and fishing.

Old Antique Atlases & Maps of Washington

Washington Map Links

Caleb Pike
About the author

Caleb Pike is an avid hiker and nature lover, with a passion for exploring the great outdoors. He's a writer, photographer, and adventurer, always seeking new trails to blaze and peaks to conquer.