A county of Tennessee, United States. County seat: Huntingdon.

One of 102 counties in Illinois, United States. County seat: Aledo. Named after Hugh Mercer. / One of 120 counties in Kentucky, United States. County seat: Harrodsburg. Named after Hugh Mercer.

One of 66 counties in South Dakota, United States. County seat: Ipswich.

One of 67 counties in Pennsylvania, United States. County seat: West Chester. / One of 46 counties in South Carolina, United States. County seat: Chester.

One of 75 counties in Arkansas, United States. County seat: Prescott. It was so named as it is roughly the shape of the state of Nevada when inverted.

One of 92 counties in Indiana, United States. County seat: Covington.

One of 67 counties in Pennsylvania, United States. County seat: Pottsville.

One of 92 counties in Indiana, United States. County seat: Newport. It borders onto Vermilion County in Illinois.

One of 67 counties in Pennsylvania, United States. County seat: Doylestown.

One of 102 counties in Illinois, United States. County seat: Danville. It borders onto Vermillion County in Indiana.