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Nearly 34% of the nation’s total coastal population lives in the densely populated coastal counties of the Northeast,and their numbers are growing rapidly,especially around urban center such as Boston and New York City.Many areas of the densely populated Northeast coast face substantial increases in the extent and frequency of coastal flooding and are at increased risk of severe storm-related damage.By the end of this century,global sea level is projected to rise 7 to 14 inches under the lower emissions scenario and 10 to 23 in inches under the higher scenario.Boston and Atlantic City,for example,can expect a coastal flood equivalent to today’s 100-year flood every two to four years on average by mid-century and almost annually by the end of the century.One of the oldest U.S.cities,Boston relies on older physical infrastructure put in place over many years and under varying building codes.Though Boston has a lengthy history of protecting itself against both the sea and rivers,the extra stresses created by sea-level rise,flooding,and more extreme storm runoff are expected to severely tax the infrastructure,threatening vulnerable neighborhoods,residents,their livelihoods,and their local economy.An unprecedented boom in housing and resort development as well as an escalation in coastal property values for much of the past century has occurred.The coastal cities have been affected by periodically population increasing.The population of certain towns in coastal New Jersey triples in summer.So does the potential for loss of life and property from coastal erosion,storms,and flooding.There has been considerable research on the possible increases in coastal flooding,but very little research on the distribution of impacts on different socio-economic groups.These communities are commonly known as environmental justice communities.My previous study centering on Boston metropolitan area has shown that vulnerability to coastal flooding appears to be closely related to economic and social factors.The result of this analysis suggests that EJ communities are more vulnerable to coastal flooding.This is because of the spatial coincidence of flooded areas and the EJ communities as well as the overlap between the indicators related to flooding resulting from this analysis and the indicators used in defining EJ communities.With sea level rise,this vulnerability will likely increase.The focus of this study is to clarify the socio-economic status on extreme flooding area by comparing two coastal area,Boston metropolitan and Metro Atlantic city as a case studies areas through quantifying the key socio-economic indicators such as income,housing value,education,industry.Based on our previous study of the Boston metropolitan area,this study looks at Atlantic City using the same indicators to define the most affective factor of vulnerable coastal cities.I include the regional staple industry and landuse distinction perceiving that economic characteristic effect to urban structure and its habitant succession.