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.
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Riverside County, CA's area is 7,303.1 square miles.
Hillsborough County, FL is 1,266 sq miles (3,279 km²).
the county of Hereford and Worcester
The largest county in the United States is San Bernardino County, California with 20,105.32 square miles.
San Bernardino County, California - 20,057 sq mi *The smallest is Kalawao County, Hawaii - 12 sq mi