These are lists of U.S. county name etymologies. Many U.S. states have counties named after U.S. presidents such as Washington, Madison, Polk, Jefferson, etc. Counties are also commonly named after famous individuals, local Native American tribes once in the area (Washoe County, Nevada), cities located within the county, and land or water features (Cerro Gordo County, Iowa, meaning "Fat Hill" in Spanish, and Lake County, Illinois, on Lake Michigan).