Puerto Rico is 53 times larger than St. Kitts and Nevis.
Area: 261 km2 World Factbook
Population: 51,538 (July 2014) World Factbook
The Federation of Saint Christopher and Nevis, located in the Leeward Islands, is a federal two-island country in the West Indies. It is the smallest sovereign state in the Americas, in both area and population. Wikipedia
Area: 13,790 km2 World Factbook
Population: 3,620,897 (July 2014) World Factbook
Puerto Rico, officially the Commonwealth of Puerto Rico, is an unincorporated territory of the United States, located in the northeastern Caribbean east of the Dominican Republic and west of both the United States Virgin Islands and the British Virgin Islands. Wikipedia