Hengshui (China) is 350 times larger than Norwalk, California.
Area: 8,846 km2 calculated
Hengshui is a prefecture-level city in southern Hebei province, People's Republic of China, bordering Shandong to the southeast. It has an urban population of 460,240 in the built-up area and a population of 4,340,373 at the 2010 census in its administrative area. It is on the Jingjiu Railway. Wikipedia
Area: 25 km2 calculated
Norwalk is a suburban city in Los Angeles County, California, United States. The population was 105,549 at the 2010 census, up from 103,298 at the 2000 census, making it the 58th most populous city in California and the 255th nationally. Wikipedia