The size of Montana is 380 838 sq km
Source:
http://travel.nationalgeographic.com/places/states/state_montana.html
it is 12,438
Montana, USA - 147,165 square miles.
The area of Montana Province is 3,635.5 square kilometers.
11,903 square kilometers
Minnesota covers a total area of 225,181 km2
Antigua is 281 square kilometers. Barbuda is 161 square kilometers. The size of Antigua and Barbuda combined is 442 square kilometers.
Montana is the fourth largest US state by area; 380,800 km2
It is 11,295 square kilometres or 4,007 square miles.
The Thar is 200,000 square kilometers or 77,000 square miles.
North Korea has a land area of approximately 120,540 square kilometers.
The European Union covers an area of approximately 4.233 million square kilometers.
Spain is 505,992 km²
Kansas, with 225,171 square kilometers of total area.