What parts of the US are the most densely populated?
Up in the northeast
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Union City is a city in Hudson County, New Jersey, United States. According to the United States 2000 Census, the city had a total population of 67,088, living on a land area… of 3.28 kmÂ² (1.27 sq mi). It is the most densely populated city in the United States, with a density of 52,977.8 per square mile - roughly twice as dense as the second densest city, New York City.    . Union City was incorporated as a city by an Act of the New Jersey Legislature on January 1, 1925, replacing both Union Hill and West Hoboken Township. 
1.toronto 2.montreal 3.ottawa
The District of Columbia, although not a state, is the most densely populated area in the USA with 9,581.3 people per square mile or 3,699.9 people per square kilometre. Ne…w Jersey is the true most densely populated state with 1,171.1 people per square mile or 452.16 people per square kilometre. The others in the top ten are: 2. Rhode Island 3. Massachusetts 4. Connecticut 5. Maryland 6. Delaware 7. New York 8. Florida 9. Ohio 10. Pennsylvania
western Europe is very densely populated; belgium, Netherlands, parts of cicily, parts of Switzerland and Italy...
The most densely populated would tend to be the smaller states. But as of 2012, New Jersey is the most densely populated, followed by Rhode Island, Massachusetts, and Connec…ticut.
Los Angeles has a very large population.
Capital Mali (Maldives)
District Of Colombia 7,000 people per sq. Mile
Coastal China, northern and southern india as well as most of Japan are very densly populated.
In Travel & Places
In United States of America
The metro area of Mexico City has the highest population density in Mexico: 5,954 people per square kilometer (15,420.8/sq mi)
Probably the East Coast, Metropolitan cities..The west is more vast, and the mid is even more spread out..