| | Lane County | OR | 41039 | | Eugene-Springfield, OR 21660 | | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=LaneCounty+OR |
| | Lincoln County | OR | 41041 | | Newport, OR 35440 | | Central | nonmetro county (rural) | recreation | https://maps.google.com/?q=LincolnCounty+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 |
| | Malheur County | OR | 41045 | | Ontario, OR-ID 36620 | Boise City-Mountain
Home-Ontario, ID-OR 147 | Central | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=MalheurCounty+OR |
| | Marion County | OR | 41047 | | Salem, OR 41420 | Portland-Vancouver-Salem,
OR-WA 440 | Central | metro county (urban) | federal/state
government-dependent | https://maps.google.com/?q=MarionCounty+OR |
| | Multnomah County | OR | 41051 | | Portland-Vancouver-Hillsboro,
OR-WA 38900 | Portland-Vancouver-Salem,
OR-WA 440 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=MultnomahCounty+OR |
| | 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 |
| | Union County | OR | 41061 | | La Grande, OR 29260 | | Central | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=UnionCounty+OR |
| | Wasco County | OR | 41065 | | The Dalles, OR 45520 | | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=WascoCounty+OR |