Since you did not specify the directions of the latitude and longitude lines, the best assumption would be 15 degrees north latitude and 100 degrees east longitude. However, there is no capital city located there, and none at the other combinations. It is actually Chainat province in Thailand.
Whitehorse
The city located at 6 degrees south latitude and 106 degrees west longitude is Lima, the capital of Peru.
Tripoli, capital city of Libya.
The largest community, Honolulu, is the state capital. The image is located at 21.5 degrees north latitude and 158 degrees west longitude.
The city located at 9 degrees north latitude and 39 degrees east longitude is Addis Ababa, the capital of Ethiopia.
Jakarta, Indonesia.
Brasilia, Brazil.
The closest capital is Rabat Morocco but its not that close
Vienna, the capital city of Austria, is located at 48 degrees north latitude and 16 degrees east longitude.
Kiev, Ukraine.
The closest capital cities are Tehran and Abu Dhabi.