Asia by a big margin, about 60% of the world's population.
The most densely populated continent is currently Europe.
(In 2000, Asia accounted for 58% of the world's population total, but not density.)
Answer
Population Density of all the continents are as follows,
Asia - 203 people per square mile
Europe - 134 people per square mile
South America - 73 people per square mile
Africa - 65 people per square mile
North America - 32 people per square mile
Australia - 6.4 people per square mile.
The population density of the planet (including all land area) is about 105 people per square mile. If Antarctica is eliminated (since it has zero population density), the world population density rises only to 115 people per square mile.
Most definetly Asia. China and India (if you count India as part of Asia and not its own subcontinent) have over 2 billion people alone. So that's 2/7ths of the world in those two countries. And there are other countries to add to that.
(Actually it's Europe if you take out the European part of Russia and Kazakhstan which most people would. Alone they add over 60% to Europe's land mass but have very low population densities which is why all the Wikipedias in this world put Asia at the highest density)
Asia is the most densely populated continent. However, Europe's land is more densely populated as a whole.
Asia.
Europe
Europe is the most densely population continent.
Asia is the continent with the most people per square mile at 203. The second most densely populated continent is Europe at 134 people per square mile.
Antarctica
don;t know
Netherlands is the most densely populated country in the world
The most densely populated area in Russia is the city of Moscow and most densely populated area in Europe is the city of Paris.
New Jersey is the United State's most densely populated state.
Africa is the least densely populated in the world, aside from Antarctica. The most densely populated continent in the world is Europe.
Metropolitan areas of Pakistan are the most densely areas. Karachi is the most densely populated city of Pakistan.
Arkansas is the 34th most densely populated state in the U.S.