Cowlitz County , Washington

Cowlitz County: County in the state of Washington, United States

Cowlitz County locator map
Location of Cowlitz County on Washington map.
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Cowlitz County is a county located in the U.S. state of Washington. As of the 2010 census, the population was 102,410 and a population density of 34 people per km². After 9 years in 2019 county had an estimated population of 110,593 inhabitants. Its county seat is Kelso. The county was created 167 years ago in 1853.


Cowlitz County is located at 46°11'36"N 122°40'51"W (46.1932900, -122.6807800). It has 5 neighbors: Columbia County, Clark County, Lewis County, Skamania County and Wahkiakum County.

The largest city of Cowlitz County is Longview with a population of 38,440. Other cities include, Kalama population 2,798 and Castle Rock population 2,298.


Cowlitz County forecast: A chance of rain showers. Mostly cloudy, with a low around 42. more

Cowlitz County map

Cowlitz County Quick Facts

Population : 110,593 (2019)
Country : United States of America
State : Washington (United States)
Area : 3021 km2
Water as percent of area : 2.2%
Land as percent of area : 97.8%
Named for : Cowlitz people
Altitude : 784 feet / 239 meters
Capital : Kelso
Establishment : January 01, 1854
Time Zone : America/Los_Angeles
Local time : 22:12:28 (7th May 2021)
Density : 37 Pop. per km² as of 2019
Population growth : 7.4% (2010-2019)
Weather : 42℉ Chance Rain Showers 7-days weather

Cowlitz County has 5 neighbors .

  • Kelso


The population of Cowlitz County increased by 7.4% in 9 years.

Year Population % Change Method
2010 102,410 - census
2011 102,309 -0.1% estimation process
2012 101,663 -0.64% estimation process
2013 101,483 -0.18% estimation process
2014 101,790 0.3% estimation process
2015 102,999 1.17% estimation process
2016 104,740 1.66% estimation process
2017 106,805 1.93% estimation process
2018 108,752 1.79% estimation process
2019 110,593 1.66% estimation process

Comitatul Cowlitz, Comte de Cowlitz, Comté de Cowlitz, Condado de Cowlitz, Condado han Cowlitz, Contea di Cowlitz, Cowlitz, Cowlitz Kun, Cowlitz Kūn, Cowlitz konderria, Cowlitz megye, Hrabstwo Cowlitz, Kantono Cowlitz, Kaulic, Koulic, Okrug Kaulic, Quan Cowlitz, Quận Cowlitz, ka'ulitaja ka'unti, kao li ci xian, kaurittsu jun, mqatʿt kwlytz, shhrstan kaywlytz washyngtn, Каулиц, Коуліц, Округ Каулиц, شهرستان کائولیتز، واشینگتن, مقاطعة كوليتز, کاولیٹز کاؤنٹی، واشنگٹن, کوولٹز کاؤنٹی, কাউলিটজ কাউন্টি, カウリッツ郡, 考利茨县

Cowlitz County Populated Places

Cities, Towns, Neighborhoods & Other Populated Places in Cowlitz County.

City Name Population Title
Longview 38,440 City in Washington state, United States
Kelso 12,417 Town and parish in Scottish Borders, Scotland
Woodland 6,495 Town in Washington state, United States
Longview Heights 3,851 Census designated place
Kalama 2,798 City in Cowlitz County, Washington, United States
Castle Rock 2,298 City in Cowlitz County, Washington, United States

Washington Other Counties (more counties)

County Name Population Title
Washington 7,614,893 State of the United States of America
King County 2,252,782 County in the state of Washington, United States
Pierce County 904,980 County in the state of Washington, United States
Snohomish County 822,083 County in the state of Washington, United States
Seattle 753,675 City in Washington, United States; county seat of King County
Spokane County 522,798 County in the state of Washington, United States
Clark County 488,241 County in Washington, United States
Thurston County 290,536 County in the state of Washington, United States
Kitsap County 271,473 County in the state of Washington, United States
Yakima County 250,873 County in the state of Washington, United States
Whatcom County 229,247 County in the state of Washington, United States
Spokane 222,081 County seat of Spokane County, Washington, United States
Tacoma 217,827 County seat of Pierce County, Washington, United States
Benton County 204,390 County in Arkansas, United States
Vancouver 184,463 City in Washington, United States and the largest suburb of Portland, Oregon
Bellevue 148,164 City in King County, Washington, United States
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