Zhongxiang (China) is 55 times larger than Concord, California.
Area: 80 km2 calculated
Concord is the largest city in Contra Costa County, California, in the United States. At the 2010 census, the city had a population of 122,067. Founded in 1869 as the community of Todos Santos by Salvio Pacheco, the name was changed to Concord within months. Wikipedia
Area: 4,420 km2 calculated
Zhongxiang is a county-level city of Jingmen, central Hubei province, People's Republic of China. The name Zhongxiang means "Blessed with propitious omen", and was given to the city by Emperor Jiajing in the Ming Dynasty. Zhongxiang is a well-known historical and cultural city in China. Wikipedia