The biggest county in the United States is San Bernardino County, California, with a land area of 20,057 square miles (51,947 km2).
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The biggest county in the United States is San Bernardino County in California, covering approximately 20,105 square miles.
There are 2,569 square miles in Lincoln County, Nevada.
The smallest county in Texas is Rockwall County, which is about 147 square miles in size.
Jackson County in Florida covers approximately 917 square miles.
Loudoun County, Virginia has a land area of approximately 520 square miles.
Travis County, Texas covers approximately 1,023 square miles.