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Name

Created

County Seat

Sq.Miles

2010 Pop.

Baker

22 Sep 1862Baker City3,06816,134

Benton

23 Dec 1847Corvallis67685,579

Champoeg

5 Jul 1843became Marion County in 1849

Clackamas

5 Jul 1843Oregon City1,868375,992

Clatsop

22 Jun 1844Astoria82737,039

Columbia

16 Jan 1854St. Helens

65649,351

Coos

22 Dec 1853Coquille

1,60063,043

Crook

24 Oct 1882Prineville

2,97920,978

Curry

18 Dec 1855Gold Beach

1,62722,364

Deschutes

13 Dec 1916Bend

3,018157,733

Douglas

7 Jan 1852Roseburg

5,036107,667

Gilliam

25 Feb 1885Condon

1,2041,871

Grant

14 Oct 1864Canyon City

4,5287,445

Harney

25 Feb 1889Burns

10,1347,422

Hood River

23 Jun 1908Hood River

52222,346

Jackson

12 Jan 1852Medford

2,785203,206

Jefferson

12 Dec 1914Madras

1,78021,720

Josephine

22 Jan 1856Grants Pass

1,63982,713

Klamath

17 Oct 1882Klamath Falls

5,94466,380

Lake

24 Oct 1874Lakeview

8,1357,895

Lane

28 Jan 1851Eugene

4,554351,715

Lincoln

20 Feb 1893Newport

97946,034

Linn

28 Dec 1847Albany

2,292116,672

Malheur

17 Feb 1887Vale

9,88731,313

Marion

1849Salem

1,183315,335

Morrow

16 Feb 1885Heppner

2,03211,173

Multnomah

22 Dec 1854Portland

435735,334

Polk

22 Dec 1845Dallas

74175,403

Sherman

25 Feb 1889Moro

8231,765

Tillamook

15 Dec 1853Tillamook

1,10225,250

Tuality

1843became Washington County in 1849

Umatilla

27 Sep 1862Pendleton

3,21575,889

Umpqua

1851merged with Douglas County in 1862

Union

14 Oct 1864La Grande

2,03625,748

Wallowa

11 Feb 1877Enterprise

3,1457,008

Wasco

11 Jan 1854The Dalles

2,38125,213

Washington

3 Sep 1849Hillsboro

723529,710

Wheeler

17 Feb 1899Fossil

1,7141,441

Yamhill

5 Jul 1843McMinnville

71599,193

36 counties as of 1916

Total

95,996

3,831,074

 

  • City links are to official government pages. County links are to the Oregon Blue Book.

  • More county numbers

  • Federal Census Totals 1790-2010

  • County selection map from U.S. Census Bureau

  • Geology.com 
    Oregon citiescounty seatsstate maps

  • In 1900, Oregon had a population of 413,536. Multnomah County had population of 103,167 and was the only county which enumerated more than 100,000 persons.

  • In 1940, Oregon reported a population of 1,089,684, the first census exceeding one million. Multnomah was still the only county reporting more than 100,000 persons; the count was 355,099.

  • By 1950, Oregon's population had increased to 1,521,341, a 40% increase over 1940. Multnomah county was up to 471,537. For the first time, two other counties exceeded 100,000 in population. Lane County surged to 125,776 from 69,096. Marion County just made it by growing to 101,401 from 75,246.

  • As of the 2010 census, 9 of 36 counties had a population exceeding 100,000. The 2013 estimate has Yamhill county also over 100,000.

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