The New York Times has released interactive graphics showing future sea level rises for the USA. These illustrate how cities would be affected at 5 feet, 12 feet and 25 feet above current levels. Based on the latest scientific data, the rises are expected to occur by 2100, 2300 and several centuries from now, respectively:
"Maps show coastal and low-lying areas that would be permanently flooded, without engineered protection, in three levels of higher seas. Percentages are the portion of dry, habitable land within the city limits of places listed that would be permanently submerged."