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B+History
History · Cosmopolis

Cosmopolis’ post office opened in 1863, and 29% of its homes were built before 1940

More historic than 70% of U.S. towns. What drives it

Its Register listing is the Neil Cooney Mansion. Below: 6 old photos and papers, maps from 1889 on, and the census since 1890.

1863first post office
1on the National Register
29%homes built before 1940
6old photos & papers
1famous people
Add an old photoShare a memory
From Cosmopolis’ archive · credits on each photo
Quick answers

How Cosmopolis began

When was Cosmopolis founded?

1863

The Cosmopolis post office opened in 1863, the earliest record of the town by name.

First census: 287 in 18902020 census: 1,638163 years

How historic is Cosmopolis?

B+

More historic than 70% of U.S. towns, on its age, its old homes and the National Register.

What drives the grade ↓
Founding year: the first Cosmopolis post office (Blevins & Helbock, CC0).The full story ↓
History grade

What drives Cosmopolis’ History grade

On its age, its old homes and the National Register, Cosmopolis is more historic than 70% of U.S. towns. Its share of homes from before 1940 holds the grade up; its age pulls it down.

B+
HistoryA character grade: shown, never part of Cosmopolis’ overall grade.
Founding era1863, from the first post office: founded 1850–1899, an older era than 37% of U.S. townsC+Homes built before 194029.4% of homes (±8.9) · typical WA town 4.3% · U.S. 8.4%A−National Register1 listing, 4.5 per 10,000 residents · typical WA town 0.1 · U.S. 2.4B
All U.S. towns we grade (21,289)Ahead of 70%
NewerOlder

Few Washington towns list much on the Register (a typical Washington town has 0.1 per 10,000 residents, the U.S. 2.4), so Cosmopolis’ 4.5 sits above most of its state (75% of Washington towns have fewer) while its 1 listings outnumber those of 51% of U.S. towns.

How sure. Graded on any two of the three inputs instead, the letter would range from B− to A−. The pre-1940 share is a Census survey estimate (±8.9 points). The founding year is the first post office, not a stated founding date.

Founding year: the first post office (other dates in Quick answers). Homes: Census ACS 2020–24. National Register: National Park Service, May 2026 list; each listing counted once (boundary changes and added documentation belong to their listing), and a historic district counts its contributing buildings. How TownRatings grades history →

What stands out about Cosmopolis’ past

Read from the archive, the National Register and the record. The page puts what stands out first.

Mapped building by building5 fire insurance maps, 1889 to 1926, drew every building in Cosmopolis.
★ What stands out · Every building

Cosmopolis, building by building, 1889–1926

Fire insurance maps drew every building, what it was made of and what it was used for, so insurers could price the risk of fire. Pick a year, then a sheet.

Cosmopolis fire insurance map, 1889, sheet 11889Sheet 1 of 1
Edition
Sheets
BrickWoodStone

Sanborn Map Company, via the Library of Congress. Editions published in 1930 or earlier, which are in the public domain.

The story

How Cosmopolis came to be

From Wikipedia’s history of Cosmopolis.

Read it all →

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 acres (62.9 ha) 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 w…

Text from Wikipedia, licensed CC BY-SA 4.0.

Timeline

Cosmopolis, 1863 to 1957

Woven from the archive, old maps, post office records, the National Register and the people born here.

  1. 19th century
  2. 1863Post officeThe Cosmopolis post office opens
  3. 1892In the archiveSaw mill on the Chehalis River at Cosmopolis, ca. 1892
  4. 20th century
  5. 1900In the archiveGrays Harbor Commercial Co. dining hall interior, Cosmopolis, Washington, ca. 1900
  6. 1911In the archiveGiant cedar tree near Cosmopolis, Wash. 51 foot around, 17 foot through ( 300 foot high e…
  7. 1920Born hereDan Spiegle is born here
  8. 1924In the archiveStreet scene showing an electric streetcar, Cosmopolis, Washington, ca. 1924
  9. 1957On the mapFirst mapped by the U.S. Geological Survey
By decade

Cosmopolis, decade by decade

4 decades in the archive, from the 1890s to the 1920s. Scroll each row; tap a photo for its story.

1890s–1910s5 items
Saw mill on the Chehalis River at Cosmopolis, ca. 1892c. 1892Saw mill on the Chehalis River at Cosmopolis, ca. 1892Grays Harbor Commercial Co. dining hall interior, Cosmopolis, Washington, ca. 1900c. 1900Grays Harbor Commercial Co. dining hall interior, Cos…Grays Harbor Commercial Co. dining hall, Cosmopolis, Washington, ca. 1900c. 1900Grays Harbor Commercial Co. dining hall, Cosmopolis, …Grays Harbor Commercial Co. dining hall, Cosmopolis, Washington, ca. 1900c. 1900Grays Harbor Commercial Co. dining hall, Cosmopolis, …Giant cedar tree near Cosmopolis, Wash. 51 foot around, 17 foot through ( 300 foot high estimated)1911Giant cedar tree near Cosmopolis, Wash. 51 foot aroun…
1920s1 item
Street scene showing an electric streetcar, Cosmopolis, Washington, ca. 1924c. 1924Street scene showing an electric streetcar, Cosmopoli…
1930s–1990snothing yet
Nothing in the archives for these yearsWeddings on Main Street, storms, parades, school pictures, the old store. If it’s in your family album, it belongs here.
Add from your album
Today3 recent
Grays Harbor Transit 802 in2021Grays Harbor Transit 802 inCooney Mansion NRHP 83003324 Grays Harbor County, WA2015Cooney Mansion NRHP 83003324 Grays Harbor County, WAChevy II Nova2008Chevy II Nova
On the map

Cosmopolis on the map, 1957 to 1992

Every edition of the U.S. Geological Survey’s map of Cosmopolis. Tap a year, or press play to watch the town change.

Cosmopolis on the 1957 USGS mapCosmopolis on the 1992 USGS map1957Aberdeen sheet · 1:24,000

U.S. Geological Survey historical topographic maps (public domain), via Esri’s collection of the scans. The red ring marks the center of Cosmopolis.

Then & now

Stand where they stood

No then-and-now pairs yet. Take a photo from the same spot as an old one and they appear here side by side.

Saw mill on the Chehalis River at Cosmopolis, ca. 1892
Retake this viewSaw mill on the Chehalis River at Cosmopolis, ca. 1892, c. 1892

Find the spot, match the angle, and add your photo. It becomes the first then-and-now pair on Cosmopolis’ page.

Retake this view · +15
On the National Register

1 historic place in Cosmopolis

The country’s official list of buildings and places worth saving.

place listed
1
National Historic Landmarks
0
none yet
historic buildings protected
1
each building in a district counts
first listed
1983
Neil Cooney Mansion
Neil Cooney Mansion
Buildings

Architectural styles listings

Bungalow1
Colonial Revival1
Neil Cooney MansionBungalow

National Park Service, National Register of Historic Places. Photos from Wikimedia Commons, credited on each place’s page.

People over time

Cosmopolis, census by census

05001,0001,5002,0001900192019401960198020002020Peak: 1,943

Between 287 and 1,943 people in every census since 1890.

14 censuses, 1890–2020.

U.S. Census Bureau decennial counts, from the census table on Cosmopolis’ Wikipedia page.

Help out

Finish Cosmopolis’s story

Most archives stop around 1920. The photos from after that are in family albums, not libraries.

Decades since 1900 with photos
00s10s20s30s40s50s60s70s80s90s
3 of 10 decades. The empty ones are waiting for someone’s album.
Retake an old viewSaw mill on the Chehalis River at Cosmo…: stand where they stood+15Share a family photoSign in to add one+10
Stories next door

History across the town line

Each neighbor’s History grade, on the same three inputs.

Aberdeen3 historic placesA−

Questions about Cosmopolis’ history

What year was Cosmopolis founded?

The Cosmopolis post office opened in 1863, the earliest record of the town by name (U.S. post office records).

How does Cosmopolis rank for history?

Cosmopolis is more historic than 70% of U.S. towns. The History grade combines the town’s founding era, the share of homes built before 1940 and its National Register listings. It’s a character grade, so it isn’t part of the overall grade. How it works.

What is on the National Register in Cosmopolis?

One place: the Neil Cooney Mansion (listed 1983).

How old are the homes in Cosmopolis?

29% of Cosmopolis’ homes were built before 1940 (Census estimate, ±8.9 points), against a typical 4.3% for a Washington town; the median home was built in 1966.

Memory lane

What the archives can’t tell you, neighbors can.

Town Square →
Start a conversation
Sources

Where this page comes from

Founding dates: Wikidata, Wikipedia, the U.S. post office records of Blevins & Helbock (CC0) and the Census. Homes by year built: Census ACS 2020–24. National Register of Historic Places: National Park Service (list of May 22, 2026). Old photos, postcards and papers: Wikimedia Commons, the Library of Congress and other public archives, credited on each item’s page. Maps: U.S. Geological Survey historical topographic maps (via Esri) and Sanborn fire-insurance maps (Library of Congress). History text and census tables: Wikipedia (CC BY-SA 4.0). Places that used to be: USGS Geographic Names Information System (2021).

From Wikimedia Commons (8), the Library of Congress (1), Wikidata (1), the National Register of Historic Places (1), Wikipedia, Wikidata and Wikipedia for famous people, U.S. Geological Survey historical maps, U.S. Census counts (via Wikipedia), the US Post Offices dataset (Blevins & Helbock), the USGS Geographic Names Information System and Sanborn fire insurance maps (Library of Congress). Archive images are copied here with their credits and licenses, shown on each photo’s page. Refreshed monthly.