Dominica is 20 times larger than Jersey City, New Jersey.
Area: 751 km2 World Factbook
Population: 73,449 (July 2014) World Factbook
Dominica, officially the Commonwealth of Dominica, is an island nation in the Lesser Antilles region of the Caribbean Sea, south-southeast of Guadeloupe and northwest of Martinique. Wikipedia
Area: 38 km2 calculated
Jersey City is the seat of Hudson County, New Jersey. As of the 2010 United States Census, the population of Jersey City was 247,597, making it the second-most populous city in New Jersey, after Newark. Wikipedia