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- Eagle County, Colorado: Eagle is named for the Eagle River.
- Elk County, Kansas: Elk is named for the Elk River.
- Escambia County, Florida: Escambia is named for the Escambia River.
- Escambia County, Alabama: Escambia, AL is also named for the Escambia River.
Read more about this topic: List Of U.S. Counties Named After Rivers