Barbados is 4.2 times larger than Montserrat.
Area: 430 km2 World Factbook
Population: 289,680 (July 2014) World Factbook
Barbados is a sovereign island country in the Lesser Antilles. It is 34 kilometres in length and up to 23 kilometres in width, covering an area of 432 square kilometres. Wikipedia
Area: 102 km2 World Factbook
Population: 5,215 (July 2014) World Factbook
Montserrat is a British Overseas Territory located in the Caribbean. The island is located in the Leeward Islands, part of the chain of islands known as the Lesser Antilles, in the West Indies. Wikipedia