A new study suggests that nine New Jersey cities will be almost entirely underwater and uninhabitable by the end of the 21st Century.

The study was conducted by Delaware-based financial firm 24/7 Wall Street. The company’s study named 35 American cities that are at risk of becoming uninhabitable due to flooding and climate change. The cities include Secaucus at No. 35, Margate City at No. 32, Brigantine at No. 29, Little Ferry at No. 26, Pennsville at No. 24, Ventnor City at No. 16, Ocean City at No. 12, Atlantic City at No. 3 and Hoboken at No. 2.

Flooding is often a problem in Hoboken. City officials have been working since Superstorm Sandy to make the city more flood resilient through its “Rebuild by Design” program.

"Rebuild by Design is to build flood protection barriers to make Hoboken resilient for decades and decades to come,” says Hoboken Mayor Ravi Bhalla. “For this exact same reason - so we do not become an underwater city in the future."

According to the 24/7 Wall Street study, 29.5% of Hoboken’s population with homes is at risk of flooding by 2060, with 43% of the city will be under water by 2100. The report also says that nearly 50% of Hoboken’s current habitable land will be underwater in 40 years, with 71% underwater in 80 years.

Bhalla says the initiatives the city has already put in place are solutions the study didn't take into account. They include wet-weather pumps, resiliency parks and underground retention tanks.

"If you came here 10 years ago - in the southwest [part of the city,] anytime it rained you'd have water to your knees. That's no longer the case,” Bhalla says.

The full list of cities at risk can be found on the 24/7 Wall Street website.