| | Polk County | OR | 41053 | | Salem, OR 41420 | Portland-Vancouver-Salem,
OR-WA 440 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=PolkCounty+OR |
| | Umatilla County | OR | 41059 | | Hermiston-Pendleton, OR 25840 | | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=UmatillaCounty+OR |
| | Wasco County | OR | 41065 | | The Dalles, OR 45520 | | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=WascoCounty+OR |
| | Yamhill County | OR | 41071 | | Portland-Vancouver-Hillsboro,
OR-WA 38900 | Portland-Vancouver-Salem,
OR-WA 440 | Outlying | metro county (urban) | nonspecialized | https://maps.google.com/?q=YamhillCounty+OR |
| | Linn County | OR | 41043 | | Albany, OR 10540 | Portland-Vancouver-Salem,
OR-WA 440 | Central | metro county (urban) | manufacturing-dependent | https://maps.google.com/?q=LinnCounty+OR |
| | Washington County | OR | 41067 | | Portland-Vancouver-Hillsboro,
OR-WA 38900 | Portland-Vancouver-Salem,
OR-WA 440 | Central | metro county (urban) | manufacturing-dependent | https://maps.google.com/?q=WashingtonCounty+OR |
| | Benton County | OR | 41003 | | Corvallis, OR 18700 | Portland-Vancouver-Salem,
OR-WA 440 | Central | metro county (urban) | federal/state
government-dependent | https://maps.google.com/?q=BentonCounty+OR |
| | Grant County | OR | 41023 | | | | | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=GrantCounty+OR |
| | Harney County | OR | 41025 | | | | | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=HarneyCounty+OR |
| | Lake County | OR | 41037 | | | | | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=LakeCounty+OR |