Pulaski County covers 333 square miles, was formed in 1839 from Wythe and Montgomery, and was named for Count Casimir Pulaski, who was killed at the siege of Savannah in 1779. New River flows through this county. Wythe County covers 479 square miles, was formed in 1789 from Montgomery, and was named for George Wythe, a signer of the Declaration of Independence. New River flows through this county.