Oregon Counties Information
| Name | Created | County Seat | Sq.Miles | 2010 Pop. |
|---|---|---|---|---|
| Baker | 22 Sep 1862 | Baker City | 3,068 | 16,134 |
| Benton | 23 Dec 1847 | Corvallis | 676 | 85,579 |
| Champoeg | 5 Jul 1843 | became Marion County in 1849 | ||
| Clackamas | 5 Jul 1843 | Oregon City | 1,868 | 375,992 |
| Clatsop | 22 Jun 1844 | Astoria | 827 | 37,039 |
| Columbia | 16 Jan 1854 | St. Helens | 656 | 49,351 |
| Coos | 22 Dec 1853 | Coquille | 1,600 | 63,043 |
| Crook | 24 Oct 1882 | Prineville | 2,979 | 20,978 |
| Curry | 18 Dec 1855 | Gold Beach | 1,627 | 22,364 |
| Deschutes | 13 Dec 1916 | Bend | 3,018 | 157,733 |
| Douglas | 7 Jan 1852 | Roseburg | 5,036 | 107,667 |
| Gilliam | 25 Feb 1885 | Condon | 1,204 | 1,871 |
| Grant | 14 Oct 1864 | Canyon City | 4,528 | 7,445 |
| Harney | 25 Feb 1889 | Burns | 10,134 | 7,422 |
| Hood River | 23 Jun 1908 | Hood River | 522 | 22,346 |
| Jackson | 12 Jan 1852 | Medford | 2,785 | 203,206 |
| Jefferson | 12 Dec 1914 | Madras | 1,780 | 21,720 |
| Josephine | 22 Jan 1856 | Grants Pass | 1,639 | 82,713 |
| Klamath | 17 Oct 1882 | Klamath Falls | 5,944 | 66,380 |
| Lake | 24 Oct 1874 | Lakeview | 8,135 | 7,895 |
| Lane | 28 Jan 1851 | Eugene | 4,554 | 351,715 |
| Lincoln | 20 Feb 1893 | Newport | 979 | 46,034 |
| Linn | 28 Dec 1847 | Albany | 2,292 | 116,672 |
| Malheur | 17 Feb 1887 | Vale | 9,887 | 31,313 |
| Marion | 1849 | Salem | 1,183 | 315,335 |
| Morrow | 16 Feb 1885 | Heppner | 2,032 | 11,173 |
| Multnomah | 22 Dec 1854 | Portland | 435 | 735,334 |
| Polk | 22 Dec 1845 | Dallas | 741 | 75,403 |
| Sherman | 25 Feb 1889 | Moro | 823 | 1,765 |
| Tillamook | 15 Dec 1853 | Tillamook | 1,102 | 25,250 |
| Tuality | 1843 | became Washington County in 1849 | ||
| Umatilla | 27 Sep 1862 | Pendleton | 3,215 | 75,889 |
| Umpqua | 1851 | merged with Douglas County in 1862 | ||
| Union | 14 Oct 1864 | La Grande | 2,036 | 25,748 |
| Wallowa | 11 Feb 1877 | Enterprise | 3,145 | 7,008 |
| Wasco | 11 Jan 1854 | The Dalles | 2,381 | 25,213 |
| Washington | 3 Sep 1849 | Hillsboro | 723 | 529,710 |
| Wheeler | 17 Feb 1899 | Fossil | 1,714 | 1,441 |
| Yamhill | 5 Jul 1843 | McMinnville | 715 | 99,193 |
| 36 counties as of 1916 | Total | 95,996 | 3,831,074 | |
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City links are to official government pages. County links are to the Oregon Blue Book.
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Geology.com
Oregon cities, county seats, state 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.
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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.
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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.
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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.
