Rhode Island (USA) is 31 times larger than Richmond, California.
Rhode Island, officially the State of Rhode Island and Providence Plantations, is a state in the New England region of the United States. Rhode Island is the smallest in area, the eighth least populous, but the second most densely populated of the 50 US states behind New Jersey. Wikipedia
Area: 86 km2 calculated
Richmond is a city in western Contra Costa County, California, United States. The city was incorporated on August 7, 1905. Wikipedia