Indirectly edit
- Cottonwood County, Minnesota is named after the Cottonwood River, which flows through the county.
- Box Elder County, Utah
- Lonoke County, Arkansas
- Pine County, Minnesota is named after the giant forests of Eastern White Pine and Red (Norway) Pine that flourish in the county.
- Alameda County, California: Alameda is named for the Spanish word for an avenue shaded by trees or a cottonwood grove.
- Fresno County, California: Fresno is named for the Spanish word meaning ash tree.