Insatiable. That’s one word to describe it. While renting an apartment in Manhattan is not everybody's cup of tea, demand continues to be high while inventory continues to be low. According to the U.S. Census, the population in Manhattan currently hovers at around 1.6 million residents. However, this number neglects to factor in the other 2.4 million commuters, day-trippers, hospital patients, tourists and students who may pass through Manahttan at any given point during the work day, reported the Rudin Center for Transportation and Management at New York University. And on major holidays and special events such as the Macy’s Day Thanksgiving Day Parade, that number easily surpasses 5 million. At the current rate, the population density in Manhattan could rival that of Hong Kong’s by as early as 2030.