4. Norway: Norway, officially known as the kingdom of Norway has a total area of 385,252 square kilometers and an approximate population of a little above 5 million. It is known to be the second least densely populated country in Europe. It shares a long eastern border with Sweden having a length of 1,619 km.

5. Brunei Darussalam: Is a sovereign state located on the north coast of the island of Borneo. It is officially known as the Nation of Brunei. According to a survey in 2012, the total population of Brunei Darussalam was 408,786. It is completely surrounded by the state of Sarawak & Malaysia and has its coastline with the South China Sea.

6. United States: Widely known as the United States (US) or simply the States, USA is a federal republic which consists of 50 states, 16 territories, and a federal district. The 48 states and the district of Washington, D.C., are in central North America between Canada and Mexico. Alaska is in the northwestern part of North America and Hawaii is an archipelago in the mid-Pacific region. The country has five populated and nine unpopulated territories in the Pacific and the Caribbean region. The largest of these territories are Puerto Rico and the American Virgin Islands.