Miami

By 2100, there is a 1 in 6 chance the combined elements of sea level rise, storm surge, and tides will rise above the 7-foot mark at Miami's nearest flood risk indicator site at Vaca Key, Fla., according to Surging Seas.

Below the 7-foot rise mark in Miami, there are 132,373 people, 68,451 homes, and 7,044 acres of land.

The OECD study ranked Miami as the No. 1 most exposed city in the world in terms of assets exposed to coastal flooding, with more than $416 billion in assets at stake.