the county of Hereford and Worcester
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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
Idaho County is 8,502 sq miles (22,020 km²).
Harney County, OR is 10,226 sq miles (26,485 km²).
Yuma County, AZ is 5,519 sq miles (14,294 km²).