The largest county in the United States is San Bernardino County, California with 20,105.32 square miles.
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Putnam County, Florida has a total area of 827 square miles.
The County of Riverside has a total land and water area of 18,915 square kilometers. The land area is 18,667 square kilometers while the water area is 248 square kilometers.
San Bernardino County is the largest county in the contiguous USA at approx 22,000 square miles. It's bigger then some of the Northeastern states. There are some counties in Alaska that are huge, but Alaska is a country all to itself.
There are two counties in the United States known as Hillsborough. Hillsborough County, Florida covers a total area of 1,266.22 square miles (3,279 square kilometers); and Hillsborough County, New Hampshire covers a total area of 892 square miles (2,310 square kilometers).
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