The population of Idaho Falls is 54,334, which makes Idaho Falls the fifth-largest city in Idaho. In 2008 the metro population was 122,995.
Land Area
According to the United States Census Bureau, the city has a total area of 17.4 square miles (45 kilometers), of which, 17.1 square miles (44.2 kilometers) of it is land and 0.3 square miles (0.8 kilometers) of it (1.67%) is water.