Physical Characteristics. Jackson County is in northwest Florida and is bordered by Holmes, Washington, Calhoun, Gadsden, and Bay counties as well as the states of Georgia and Alabama. Jackson is the only county in Florida to border two states. The county has 941.58 square miles of land and 12.80 square miles of water for a total of 954.38 square miles. The average January temperature is 52.6 degrees Fahrenheit, and the average August temperature is 81.0 degrees Fahrenheit. The average annual rainfall is 54.69 inches.
History. Jackson County was established from Escambia County in 1822 and named for Andrew Jackson, governor of the territories of East and West Florida and later president of the U.S. Marianna was the site of a battle in 1864, during which old men and young boys fought against the invasion of Federal forces.
