:80,000 is obviously wrong, that zip code includes portions of Weehawken (look at the google earth zip code layer).  See here for the 2000 census data:    As of the 2000 census, it is 67088 people in 1.255341 sq miles (3.279807 sq km) = 52977.8 ppl/sqmi (20454.8 ppl/sqkm).  I think we should avoid using the census estimate in the intro and infobox, it is just an estimate and may be wrong.  Also, the "most dense city" label is based on the 2000 census (not the estimate) and the fact that it is a "city" form of government.  Guttenberg is more dense, but not a city.  Manhattan is more dense, but is a county and only portion of NYC.