| Information by State |
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| US Counties
| Oregon
| Columbia
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| Find a Lawyer in Columbia County: |
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| Columbia County, Oregon (OR) |
| Address: |
County Courthouse |
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230 Strand Street |
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St. Helens, Oregon 97051 |
| County Seat: |
St. Helens |
| Phone: |
503-397-3796 |
| Fax: |
503-397-7266 |
| Website: |
www.co.columbia.or.us |
| Established: |
1854 |
| Area: |
687 sq mi |
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| Columbia County, Oregon Communities: |
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| Total Communities in Columbia County, Oregon: 7 |
| Population: |
| 49,656 |
50,930 |
51,795 |
52,377 |
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| 2015 * |
2016 * |
2017 * |
2018 * |
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| 49,351 |
49,402 |
49,215 |
49,265 |
49,499 |
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| 2010 |
2011 * |
2012 * |
2013 * |
2014 * |
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| * (U.S. Census Estimate) |
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Contact Us. |
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