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- Tornadoes since 2000: 5 (0.16 per 100 square miles)
- #2,064 nationally
- Tornadoes this year, as of May 31: 0

#3. Umatilla County

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- Tornadoes since 2000: 5 (0.27 per 100 square miles)
- #2,039 nationally
- Tornadoes this year, as of May 31: 0

#2. Clackamas County

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- Tornadoes since 2000: 5 (0.42 per 100 square miles)
- #1,996 nationally
- Tornadoes this year, as of May 31: 0

#1. Marion County