Dewey Decimal Numbers: Oregon
General information about Oregon is found in 979.5. Knowing the Dewey Decimal number for a county or a series of counties within a state makes it easier for a researcher to browse the shelves. The following chart lists Oregon's counties in alphabetical order followed by their Dewey Decimal number.
| Baker | 979.575 | Harney | 979.595 | Morrow | 979.567 |
| Benton | 979.534 | Hood River | 979.561 | Multnomah | 979.549 |
| Clackamas | 979.541 | Jackson | 979.527 | Polk | 979.538 |
| Clatsop | 979.546 | Jefferson | 979.585 | Sherman | 979.564 |
| Columbia | 979.547 | Josephine | 979.525 | Tillamook | 979.544 |
| Coos | 979.523 | Klamath | 979.591 | Umatilla | 979.569 |
| Crook | 979.583 | Lake | 979.593 | Union | 979.571 |
| Curry | 979.521 | Lane | 979.531 | Wallowa | 979.573 |
| Deschutes | 979.587 | Lincoln | 979.533 | Wasco | 979.562 |
| Douglas | 979.529 | Linn | 979.535 | Washington | 979.543 |
| Gilliam | 979.565 | Malheur | 979.597 | Wheeler | 979.581 |
| Grant | 979.578 | Marion | 979.537 | Yamhill | 979.539 |
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Modified: 31 Jul 2008