With an average 1,196 people per square mile, the Garden State has a population density that's higher than India and Lebanon but not quite on par with the Netherlands.
The Census Bureau also reported data on Washington, D.C., and, of course, it's much denser: 9,857 people per square mile. If it were its own country, Washington would be the world's sixth most dense nation (or seventh, if you count Gaza as a separate country).
The least densely populated state in the Union remains Alaska. With 1.2 people per square mile, it is twice as densely populated as Denmark's Greenland but has nearly four times fewer people than Mongolia. [Editor's note: This paragraph was corrected to show that Alaska is the least densely populated state in the US.]