In the United States, an independent city is a city that is not in the territory of any county or counties with exceptions noted below.
Of the 41 independent U.S. cities, 38 are in Virginia, whose state constitution makes them a special case. The three independent cities outside of Virginia are Baltimore, Maryland; St. Louis, Missouri; and Carson City, Nevada.
The U.S. Census Bureau uses counties as its base unit for presentation of statistical information, and treats independent cities as county equivalents for those purposes. Baltimore, Maryland is the largest independent city in the United States.
In the Commonwealth of Virginia, all municipalities incorporated as "cities" have been "independent cities", also called "free cities", since 1871, when a revised state constitution took effect following the American Civil War and the creation of West Virginia. Virginia's thirty-eight independent cities are not politically part of a county, even though geographically they may be completely surrounded by one. An independent city in Virginia may serve as the county seat of an adjacent county, even though the city by definition is not part of that county. Some other Virginia municipalities, even though they may be more populous than some existing independent cities, are incorporated towns. These towns always form part of a county. Incorporated towns have limited powers, varying by each charter. They typically share many aspects such as courts and public school divisions with the county they are within.