According to the 2000 census , the county has a total area of 777.92 square miles ( 2,014.8 km2 ) , of which 776.87 square miles ( 2,012.1 km2 ) ( or 99.87 % ) is land and 1.05 square miles ( 2.7 km2 ) ( or 0.13 % ) is water .
776.87 square miles ( 2,012.1 km2 ) ( or 99.87 % ) is land and 1.05 square miles ( 2.7 km2 ) ( or 0.13 % ) is water .