St. Louis is 3.5 times larger than Providence, Rhode Island.
Area: 49 km2 calculated
Providence is the capital and most populous city in Rhode Island. Founded in 1636, it is one of the oldest cities in the United States. It is located in Providence County, and is the third-largest city in the New England region after Boston and Worcester. Wikipedia
Area: 170 km2 calculated
St. Louis is an independent city and a major United States port in eastern Missouri. The city reaches the western banks of the Mississippi River, which forms Missouri's eastern border with Illinois. At the 2010 census, St. Wikipedia