According to the United States Census Bureau, the city has a total area of 620.34 square miles (1,606.7 km2), of which, 601.11 square miles (1,556.9 km2) of it is land and <answer>19.23 square miles</answer> (49.8 km2) of it is water. The total area is 3.09 percent water.
Out of the 620.34 square miles, how much of it is water?
19.23 square miles