according to worldatlas.com it is Monaco with a population density of 41,970.77 per square mile
El Istole in Colombia (south america) has a population desity of 1.2 persons per square meter.
The country with the highest population density is Monacowith 41,970 people per square mile. The second highest is Singapore with 16,540 people per square mile.
The population desity is currently about 33 persons per square mile,
Per capita.
Monaco. There are 18,369 persons per square kilometer.
The political entity that has the highest population density is Monaco. In 2005, the average density was 16923 persons per square kilometer, total area 1.95 square kilometers. This is followed by Gibraltar, Vatican City, Malta, and San Marino. Malta, with over 400,000 residents, is the densest large country.The major country with the highest population density is the Netherlands, with a density of about 400 persons per square kilometer, which is 16 million people in 41,526 square kilometers.
Monaco is the country with the most people per square kilometer.
The state with the highest population density is New Jersey. It has 1,210 people for each square mile or 467 per square kilometer.
Monaco's population density is the world's highest at 39,217 people per square mile.
Shanghai is the city with the highest population at 24,256,800. Tokyo is the city with the highest metropolitan area population at 36,923,000. Tokyo is also the city with the highest urban area population at 37,750,000. London is the largest city by land size at 9,078 square kilometres. Manila is the city with the highest population density at 42,857 people per square kilometre.
Ecuador has the highest population density in Latin America with 58.95 people per square kilometer. Its largest ethnic group are Mestizos who are descendants of Spanish colonialists and Native American people. The majority of the population lies in the Andes, along the Pacific coast and in the central provinces.
If you mean dense, as in stupid, I wouldn't even hazard a guess at that one, but do you mean densely populated? If so, I'd hazard a guess at Great Britain simply based on the size of the country. This is just a guess. Vatican City. It is .17 square miles and 860 people live there.