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).

• List of U.S. county name etymologies (A–D)
• List of U.S. county name etymologies (E–I)
• List of U.S. county name etymologies (J–M)
• List of U.S. county name etymologies (N–R)
• List of U.S. county name etymologies (S–Z)

• List of U.S. counties named after prominent Confederate historical figures
• List of the most common U.S. county name etymologies
• List of U.S. counties named after rivers
• List of U.S. counties named after women
• List of U.S. counties named after presidents of the United States

• U.S. state
• County (United States)
• List of U.S. state name etymologies
• List of U.S. place names of Spanish origin

• GEOBOPological Survey: The most popular county names, from Washington to Buffalo

This article includes a location-related list of lists.