| | Benton County | OR | 41003 | | Corvallis, OR 18700 | Portland-Vancouver-Salem,
OR-WA 440 | Central | in metro of < 250k | federal/state
government-dependent | https://maps.google.com/?q=BentonCounty+OR |
| | Clackamas County | OR | 41005 | | Portland-Vancouver-Hillsboro,
OR-WA 38900 | Portland-Vancouver-Salem,
OR-WA 440 | Central | in metro of > 1m | nonspecialized | https://maps.google.com/?q=ClackamasCounty+OR |
| | Clark County | WA | 53011 | | Portland-Vancouver-Hillsboro,
OR-WA 38900 | Portland-Vancouver-Salem,
OR-WA 440 | Central | in metro of > 1m | nonspecialized | https://maps.google.com/?q=ClarkCounty+WA |
| | Columbia County | OR | 41009 | | Portland-Vancouver-Hillsboro,
OR-WA 38900 | Portland-Vancouver-Salem,
OR-WA 440 | Outlying | in metro of > 1m | nonspecialized | https://maps.google.com/?q=ColumbiaCounty+OR |
| | Cowlitz County | WA | 53015 | | Longview-Kelso, WA 31020 | Portland-Vancouver-Salem,
OR-WA 440 | Central | in metro of < 250k | nonspecialized | https://maps.google.com/?q=CowlitzCounty+WA |
| | Linn County | OR | 41043 | | Albany, OR 10540 | Portland-Vancouver-Salem,
OR-WA 440 | Central | in metro of < 250k | manufacturing-dependent | https://maps.google.com/?q=LinnCounty+OR |
| | Marion County | OR | 41047 | | Salem, OR 41420 | Portland-Vancouver-Salem,
OR-WA 440 | Central | in metro of > 250k
< 1m | 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 | in metro of > 1m | nonspecialized | https://maps.google.com/?q=MultnomahCounty+OR |
| | Polk County | OR | 41053 | | Salem, OR 41420 | Portland-Vancouver-Salem,
OR-WA 440 | Central | in metro of > 250k
< 1m | nonspecialized | https://maps.google.com/?q=PolkCounty+OR |
| | Skamania County | WA | 53059 | | Portland-Vancouver-Hillsboro,
OR-WA 38900 | Portland-Vancouver-Salem,
OR-WA 440 | Outlying | in metro of > 1m | recreation | https://maps.google.com/?q=SkamaniaCounty+WA |