Rockwall County: 129 square miles.
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Travis County, Texas covers approximately 1,023 square miles.
Tarrant County in Texas covers an area of around 902 square miles.
Shelby County is the largest county in Tennessee by square miles, covering an area of approximately 784 square miles.
There are 2,569 square miles in Lincoln County, Nevada.
The largest county in square miles in Kansas is Sedgwick County, with an area of approximately 998 square miles.