A seat on the train is hard to come by these days, because more people are flowing right into the five boroughs.

New estimates given to NY1 show that since the 2010 census, New York City’s population has grown from 8.2 million to 8.6 million.

Every single borough saw population growth — Brooklyn had the largest, Staten Island he smallest.

The figures show that the city is almost the only source of the state's population rise.

Since 2010, 95 percent of the population growth in the state was in the five boroughs.

"When you look at all the counties in New York State you find out there are only a small number that are actually growing," said Joseph Salvo of the Department of City Planning. "The total change from 2010 for a city of this size is substantial."

Look at the map and you can see all of the counties in red have lost population. The city, Westchester and a handful of others were the only ones gaining.

Behind the numbers, are hundreds of thousands of immigrants from China and the Dominican Republic. Bangladesh is a rising contributor too.

These numbers are just estimates for now. They won't matter until the 2020 census in two years.

The census can be used to dictate how much funding the city gets from Washington, for services from health care to education.

"What goes along with that are dollars for bridges and dollars for all the services that the city provides," Salvo said.

Officials tell NY1 it's unclear if our population will continue to grow at this rate. But they say we should be prepared and make some room.