Cosmopolis, Washington

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title: "Cosmopolis, Washington" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["cities-in-washington-(state)", "cities-in-grays-harbor-county,-washington"] topic_path: "geography" source: "https://en.wikipedia.org/wiki/Cosmopolis,_Washington" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::data[format=table title="Infobox settlement"]

Field	Value
official_name	Cosmopolis, Washington
settlement_type	City
mapframe	yes
mapframe-point	none
map_caption	Interactive location map of Cosmopolis
subdivision_type	Country
subdivision_name	United States
subdivision_type1	State
subdivision_name1	Washington
subdivision_type2	County
subdivision_name2	Grays Harbor
government_type	Mayor–council
established_title	Incorporated
established_date	1891
unit_pref	Imperial
area_footnotes
area_total_km2	4.09
area_land_km2	3.60
area_water_km2	0.49
area_total_sq_mi	1.58
area_land_sq_mi	1.39
area_water_sq_mi	0.19
population_as_of	2020
population_footnotes
population_total	1638
population_urban	26603
population_metro	77038
population_density_km2	461.05
population_density_sq_mi	1193.97
population_est	1667
pop_est_as_of	2022
pop_est_footnotes
leader_title	Mayor
leader_name	Linda Springer
timezone	Pacific (PST)
utc_offset	-8
timezone_DST	PDT
utc_offset_DST	-7
elevation_footnotes
elevation_ft	23
coordinates
postal_code_type	ZIP code
postal_code	98537
area_code	360
blank_name	FIPS code
blank_info	53-14870
blank1_name	GNIS feature ID
blank1_info	2410238
website
::

Cosmopolis is a city in Grays Harbor County, Washington, United States. The population was 1,638 at the 2020 census. It lies on the Chehalis River and U.S. Route 101, immediately southeast of Aberdeen. Cosmopolis historically had an economy that centered around its pulp mill, which closed in 2006.

History

The area around the mouth of the Chehalis River is the ancestral home of indigenous Coast Salish peoples who are today referred to as the Lower Chehalis. The first white settler in the area, James Pilkington, staked a Donation Land Act claim to 155.5 acre on the south bank of the river in 1852. The site was later used for unsuccessful negotiations between indigenous representatives and the Washington territorial government for the 1855 Chehalis River Treaty. Pilkington built a cabin on the land, but later sold the property in 1853 to Kentucky-born emigrants David F. Byles and Austin E. Young. Byles and Young proposed a plat for a town named Cosmopolis on the south bank of the Chehalis River. The origin of the name is unclear; one account is that it came from an indigenous chief's name, and another claims that an earlier settler asked for a name that means "city of the whole world".

Cosmopolis was platted in 1861 and is considered the oldest modern settlement in Grays Harbor County (then known as Chehalis County). Several settlers had attempted to build the townsite as planned, but failed due to various business issues. A lumber mill opened in 1881 and soon became profitable, bringing other businesses to Cosmopolis, which was incorporated as a town in 1891. The Northern Pacific Railway constructed a spur line through the new town in 1892 that traveled across a bridge to Junction City on the north side of the Chehalis River, with onward connections to Tacoma. The mill grew in the early 20th century under various owners until it was sold to Weyerhaeuser in 1957.

Geography

Cosmopolis lies on the south side of the Chehalis River near its mouth at the head of Grays Harbor, an estuarine bay of the Pacific Ocean. Mill Creek, a short tributary of the Chehalis River, runs through the western part of the city. The city borders Aberdeen to the northwest. According to the United States Census Bureau, Cosmopolis has a total area of 1.52 sqmi, of which, 1.33 sqmi is land and 0.19 sqmi is water.

Climate

This region experiences warm (but not hot) and dry summers, with no average monthly temperatures above 71.6 °F. According to the Köppen Climate Classification system, Cosmopolis has a warm-summer Mediterranean climate, abbreviated "Csb" on climate maps.

Demographics

|1890= 287 |1900= 1004 |1910= 1132 |1920= 1512 |1930= 1943 |1940= 1207 |1950= 1164 |1960= 1312 |1970= 1599 |1980= 1575 |1990= 1372 |2000= 1595 |2010= 1649 |2020= 1638 |estyear=2022 |estimate=1667 |estref= |align-fn=center |footnote=U.S. Decennial Census 2020 Census

2010 census

As of the 2010 census, there were 1,649 people, 677 households, and 463 families living in the city. The population density was 1239.8 PD/sqmi. There were 714 housing units at an average density of 536.8 /sqmi. The racial makeup of the city was 88.5% White, 0.1% African American, 1.6% Native American, 3.0% Asian, 0.3% Pacific Islander, 3.6% from other races, and 2.9% from two or more races. Hispanic or Latino of any race were 6.1% of the population.

There were 677 households, of which 31.9% had children under the age of 18 living with them, 52.4% were married couples living together, 9.7% had a female householder with no husband present, 6.2% had a male householder with no wife present, and 31.6% were non-families. 24.8% of all households were made up of individuals, and 10.2% had someone living alone who was 65 years of age or older. The average household size was 2.44 and the average family size was 2.87.

The median age in the city was 41.5 years. 22.6% of residents were under the age of 18; 7.5% were between the ages of 18 and 24; 24.9% were from 25 to 44; 28.9% were from 45 to 64; and 16.3% were 65 years of age or older. The gender makeup of the city was 48.9% male and 51.1% female.

2000 census

As of the 2000 census, there were 1,595 people, 645 households, and 454 families living in the city. The population density was 1,142.3 people per square mile (439.9/km2). There were 681 housing units at an average density of 487.7 per square mile (187.8/km2). The racial makeup of the city was 93.04% White, 0.13% African American, 1.76% Native American, 1.50% Asian, 0.06% Pacific Islander, 1.19% from other races, and 2.32% from two or more races. Hispanic or Latino of any race were 3.32% of the population. 17.3% were of German, 10.0% Irish, 9.6% American, 7.7% Polish, 6.1% English and 5.0% Italian ancestry.

There were 645 households, out of which 30.5% had children under the age of 18 living with them, 57.8% were married couples living together, 10.2% had a female householder with no husband present, and 29.6% were non-families. 25.0% of all households were made up of individuals, and 9.5% had someone living alone who was 65 years of age or older. The average household size was 2.47 and the average family size was 2.92.

In the city, the population was spread out, with 25.8% under the age of 18, 6.8% from 18 to 24, 27.1% from 25 to 44, 25.5% from 45 to 64, and 14.9% who were 65 years of age or older. The median age was 39 years. For every 100 females, there were 96.9 males. For every 100 females age 18 and over, there were 96.0 males.

The median income for a household in the city was $41,106, and the median income for a family was $51,000. Males had a median income of $41,411 versus $25,714 for females. The per capita income for the city was $18,759. About 7.4% of families and 11.3% of the population were below the poverty line, including 15.2% of those under age 18 and 9.2% of those age 65 or over.

Government

The city operates as a mayor–council government with five elected councilmembers and a mayor. , the city had 13 employees and $3.5 million in revenue (a decrease from $4.2 million in 2022). By 2025, Cosmopolis had deferred its major capital improvements to remain financially stable due to a small tax base.

Parks and recreation

Cosmopolis is home to Mill Creek Park, a 39 acre green space that contains a pond. Native wildlife in the park include duck, geese and great blue heron.

Marenko Park is a 39 acre forested park located on the city's west side. The park contains over 2 mi of paths; dogs and biking are allowed. The park also contains two public soccer fields.

Economy

In 2006, Weyerhaeuser pulp mill operations shut down, costing the local community approximately 350 jobs and the city government about 40percent of its tax revenue. A year earlier, Weyerhaeuser had closed their large-log saw mill in Aberdeen, losing 83 jobs. The Cosmopolis mill was purchased in late 2010 by the Gores Group and renamed Cosmo Specialty Fibers, which manufactured specialty pulps for export to Asia when it reopened in 2011. The mill closed in 2020 during the COVID-19 pandemic and briefly reopened in 2022 before closing again. Cosmo Specialty Fibers was fined several times for environmental violations by state and federal agencies, including a $2.3 million penalty issued in 2025 for chemical leaks by the Washington State Department of Ecology.

Infrastructure

Cosmopolis lies along U.S. Route 101, a major highway that connects area of the Pacific Coast.

As part of the Chehalis Basin Strategy, a concrete, steel, and earthen dam was constructed on Mill Creek. Completed in 2018, the $3.1 million project replaced a 1913 dam that collapsed in 2008, forcing the closure of Mill Creek Park. While the old dam had hampered migrating fish, the new structure included fish ladders and local species of salmon and trout were recorded soon thereafter migrating past the dam.

, the city services approximately 765 residents with water, sewer and stormwater utilities, generating approximately $1.33 million in annual revenue.

Notable people

Elton Bennett, artist

References

"2020 U.S. Gazetteer Files". United States Census Bureau.
"Mayor's Office".
{{GNIS. 2410238
"Explore Census Data". [[United States Census Bureau]].
Caldbick, John. (May 5, 2025). "Cosmopolis — Thumbnail History". [[HistoryLink]].
Meany, Edmond S.. (1923). "Origin of Washington Geographic Names". [[University of Washington Press]].
Wilma, David. (May 27, 2006). "Grays Harbor County — Thumbnail History". HistoryLink.
{{cite WSDOT map. (2014)
(2023). "Aberdeen Quadrangle, Washington – Grays Harbor County". [[United States Geological Survey]].
"US Gazetteer files 2010". [[United States Census Bureau]].
[http://www.weatherbase.com/weather/weather-summary.php3?s=800054&cityname=Cosmopolis%2C+Washington%2C+United+States+of+America&units= Climate Summary for Cosmopolis, Washington]
(November 9, 2023). "City and Town Population Totals: 2020-2022". United States Census Bureau.
"U.S. Decennial Census". Census.gov.
(November 29, 2021). "Take a Walk through the Trails of Cosmopolis".
(July 31, 2021). "Proposed disc golf course at Cosmopolis' Makarenko Park moving forward". [[The Daily World (Aberdeen).
Swanson, Conrad. (April 13, 2025). "Cosmopolis on the brink: How a rural WA town illustrates an American crossroads". The Seattle Times.
Powell, Melissa. (July 16, 2011). "Tales of how 3 manufacturers managed to thrive during the Great Recession". The Seattle Times.
Ott, Jennifer. (January 6, 2010). "Weyerhaeuser's large-log sawmill in Aberdeen closes on December 22, 2005.". HistoryLink.
(September 17, 2010). "Shuttered Cosmopolis pulp mill sold, to reopen soon". The Seattle Times.
Duan, Ann. (July 23, 2025). "Dormant Grays Harbor pulp mill fined $2.3 million for toxic chemical spills". [[The Olympian]].
(May 24, 2024). "Chehalis Basin Strategy in review: Replacement dam on Mill Creek still bringing flood protection for 200-plus homes and businesses". [[The Chronicle (Centralia, Washington).
McCarthy, Pat. (December 26, 2024). "Accountability Audit Report; City of Cosmopolis; For the period January 1, 2022 through December 31, 2023 (Report No. 1036375)".

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