The answer is London
The capital city of Brasilia, Brazil, is located at approximately 15.8 degrees south latitude. Another capital city located at a similar latitude is Windhoek, the capital of Namibia, which is situated at about 22.6 degrees south latitude. Both cities are in the southern hemisphere and experience similar climatic conditions due to their proximity to the Tropic of Capricorn.
The south end of Runway-36 at Khartoum International Airport is located at 15.5761° north latitude 32.5533° east longitude. The north end of Runway-18 is located at 15.6029° north latitude 32.5531° east longitude. Other spots around the capital city have different coordinates.
In terms of latitude, Vancouver is closest to cities like Seattle, Washington, and Portland, Oregon, as they are all situated in the Pacific Northwest region of North America. Vancouver's latitude is approximately 49.3° N, placing it near other major cities in that latitude range, including parts of southern Canada and northern U.S. states.
-- The center of the field at Estadio Walmir Campelo Bezerra soccer stadium is located at 16.0114° south latitude 48.0617° west longitude. -- The east end of Runway-29R at Brasilia International Airport is located at 15.8616° south latitude 47.8978° west longitude. -- The point midway between the twin towers of the Congresso Nacional building is located at 15.7997° south latitude 47.8634° west longitude. Other points around the capital have different coordinates.
La Paz Bolivia
The city located at approximately 44 degrees north latitude in New Hampshire is Concord, which is also the state capital. This latitude runs through several other areas in the state, but Concord is the most notable city at this position. The city is known for its rich history and is a central hub for government and commerce in New Hampshire.
Annapolis is the capital city in the U.S. state of Maryland.
Washington D.C.
The capital of Maryland is Annapolis and the capital of Delaware is Dover. These two cities are approximately 65 miles from each other.
The Washington Monument is located at 38.8895° north latitude 77.0352° west longitude. Other spots around our nation's capitol have different coordinates.
Washington DC is the capital of the U.S. Washington DC is a federal district known as the District of Columbia. In addition, the U.S. government has several other kinds of "federal districts" which are not specifically related to a capital city.
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.