Physical Characteristics. Osceola County is south of Orlando, west of Melbourne-Titusville, and east of Lakeland-Winter Haven, and is bordered by Brevard, Orange, Polk, Okeechobee, and Indian River counties. The county has 1349.68 square miles of land and 157.00 square miles of water for a total of 1506.68 square miles. The average January temperature is 61.3 degrees fahrenheit and the average August temperature is 82.1 degrees fahrenheit. The average annual rainfall is 50.06 inches.
History. Osceola County was established in 1887 from portions of Orange and Brevard counties and named for Osceola, leader of the Seminoles who was captured and imprisoned by General Thomas S. Jesup under a flag of truce.
