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, 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). Please add county name etymologies for any state that interests you!
- List of Alabama county name etymologies
- List of Alaska borough and census area name etymologies
- List of Arizona county name etymologies - Under construction
- List of Arkansas county name etymologies
- List of California county name etymologies - Complete
- List of Colorado county name etymologies - Complete
- List of Connecticut county name etymologies
- List of Delaware county name etymologies - Under construction
- List of Florida county name etymologies - Complete
- List of Georgia county name etymologies
- List of Hawaii county name etymologies
- List of Idaho county name etymologies
- List of Illinois county name etymologies
- List of Indiana county name etymologies
- List of Iowa county name etymologies - Under construction
- List of Kansas county name etymologies - Complete
- List of Kentucky county name etymologies - Under construction
- List of Louisiana parish name etymologies
- List of Maine county name etymologies
- List of Maryland county name etymologies
- List of Massachusetts county name etymologies
- List of Michigan county name etymologies - Complete
- List of Minnesota county name etymologies - Complete
- List of Mississippi county name etymologies
- List of Missouri county name etymologies - Complete
- List of Montana county name etymologies - Complete
- List of Nebraska county name etymologies
- List of Nevada county name etymologies
- List of New Hampshire county name etymologies - Complete
- List of New Jersey county name etymologies - Complete
- List of New Mexico county name etymologies - Complete
- List of New York county name etymologies - Complete
- List of North Carolina county name etymologies - Under construction
- List of North Dakota county name etymologies
- List of Ohio county name etymologies
- List of Oklahoma county name etymologies - Complete
- List of Oregon county name etymologies
- List of Pennsylvania county name etymologies
- List of Rhode Island county name etymologies
- List of South Carolina county name etymologies
- List of South Dakota county name etymologies
- List of Tennessee county name etymologies
- List of Texas county name etymologies - Complete
- List of Utah county name etymologies - Complete
- List of Vermont county name etymologies
- List of Virginia county name etymologies
- List of Washington county name etymologies - Under construction
- List of West Virginia county name etymologies
- List of Wisconsin county name etymologies
- List of Wyoming county name etymologies - Complete