Rocky Mountain National Park is 54% larger than Singapore.
Area: 697 km2 World Factbook
Population: 5,567,301 (July 2014) World Factbook
Singapore, officially the Republic of Singapore, is a sovereign city-state and island country in Southeast Asia. It lies off the southern tip of the Malay Peninsula and is 137 kilometres north of the equator. Wikipedia
Area: 1,075 km2 calculated
Rocky Mountain National Park is a national park located in the north-central region of the U.S. state of Colorado. Wikipedia