Oregon has 36 counties and 5 congressional districts: 32 counties are wholly within a given congressional district; 4 counties are divided among more than one congressional district.

UNDIVIDED COUNTIES (wholly within one Congressional District):

• CD 1: Clatsop, Columbia, Washington and Yamhill.
• CD 2: Baker, Crook, Deschutes, Gilliam, Grant, Harney, Hood River, Jackson, Jefferson, Klamath, Lake, Malheur, Morrow, Sherman, Umatilla, Union, Wallowa, Wasco and Wheeler.
• CD 4: Coos, Curry, Douglas, Lane and Linn.
• CD 5: Lincoln, Marion, Polk and Tillamook.

DIVIDED COUNTIES (split between more than one Congressional District):

• Benton: CDs 4 and 5
• Clackamas: CDs 1, 3 and 5
• Josephine: CDs 2 and 4
• Multnomah: CDs 1 and 3