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- Tallapoosa County, Alabama: Tallapoosa is named for the Tallapoosa River. Tallapoosa is believed to be a Choctaw word meaning pulverized rock.
- Tangipahoa Parish, Louisiana: named for the Tangipahoa River
- Tensas Parish, Louisiana: named for the Tensas River
- Tippecanoe County, Indiana: Tippecanoe is named for the Tippecanoe River and the Battle of Tippecanoe.
- Tuscaloosa County, Alabama: Tuscaloosa was a Native American name for the Black Warrior River.
- Tuscarawas County, Ohio: Tuscarawas is named for the Tuscarawas River.
Read more about this topic: List Of U.S. Counties Named After Rivers