This is because despite being the largest city in the country, New York City only has around 6% of the total U.S. population when its metropolitan area is taken into account.
A primate city, on the contrary, is a city that has 20%, 30% or even 40% of the total population of the country, regardless of how much larger it is than the second city.
It is an irregular quadrilateral in shape, and its shores, save on the west, are deeply indented. Its greatest length from north to south is 210 miles (337 km),