Rockwall County: 129 square miles.
The smallest county in Texas is Rockwall County, which is about 147 square miles in size.
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.
Galveston County, Texas, USA - 873 square miles.
It is about 512 square miles. That is about 1326 square kilometres. It is the smallest county in Northern Ireland and the 6th smallest in all of Ireland.
Brewster County is the largest county in Texas at 6,193 square miles.
The land area of Texas is approximately 262,000 square miles, and Texas has 254 counties, so the average area is slightly over 1000 square miles per county. Brewster County (the largest) is over 6 times that large, while Rockwall (the smallest) is about 1/8 of that.
* Dallas County Arkansas is 668 square miles. * Dallas County Texas 908 square miles.
The smallest county in Utah as far as land area is Davis County. Davis County has 304 square miles of land area and 329 square miles of water. The total area of the county is 634 square miles. Morgan County is the smallest in terms of total area with 611 square miles of area, 609 square miles of land and 2 square miles of water. The above figures come from the U.S. Census Bureau.
Clark County is Idaho's smallest county based on population with a population of 982 as of the 2010 Census. Payette County is Idaho's smallest county based on area with 408 square miles.
As far as square miles - Derby, Connecticut In regards to population - Union, Connecticut
Travis County, Texas covers approximately 1,023 square miles.
2,844 square kilometres or 1,098 square miles.
Las Animas County is the largest county in the state of Colorado. 4,775 square miles (12,368 km²)
Texas Counties and County Trivia: Texas has some large counties like its largest Brewster County at 6,193 square miles. Texas has no county that fits into the 25 largest counties (or equivalent units) in the US, with seven Alaska counties at 12,750 square miles each or larger.Pecos County at 4,764 square miles.Hudspeth County at 4,571 square miles.Presido County at 3,856 square miles.Webb County at 3,357 square miles.Val Verde County at 3,171 square miles.