One of 67 counties in Florida, United States. County seat: Fernandina Beach. Named after the Duchy of Nassau.

One of 120 counties in Kentucky, United States. County seat: Mayfield.

One of 82 counties in Mississippi, United States. County seat: Corinth.

One of 114 counties in Missouri, United States. County seat: Farmington.

One of 10 counties in New Hampshire, United States. County seat: Dover.

One of 100 counties in North Carolina, United States. County seat: Mocksville.

One of 5 counties in Rhode Island, United States. Largest city: Providence. There is no county seat.

A county of Georgia, United States. County seat: Nahunta.

One of 102 counties in Illinois, United States. County seat: Clinton. Named after DeWitt Clinton. / One of 254 counties in Texas, United States. County seat: Cuero. Named after Green DeWitt.

One of 58 counties in California, United States. County seat: San Andreas.