Shelby County with 755 square miles.
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The largest county in square miles in Kansas is Sedgwick County, with an area of approximately 998 square miles.
The largest county in South Carolina in terms of square miles is Horry County, with an area of around 1,134 square miles.
Nye County is the largest county in Nevada in terms of size, covering approximately 18,147 square miles.
Osage County is the largest county in Oklahoma, measuring approximately 2,304 square miles.
Kossuth County is the largest county in Iowa by land area, covering approximately 973 square miles.