Climate: U.S. Population in the Coastal floodplain

Climate change poses significant risks to our nation, particularly to coastal areas prone to flooding. Assessing the growing population within these areas provides us a better understanding of who is at risk to coastal inundation from storm surge and long-term sea level rise.

16.6 million

Approximate population residing in the coastal floodplain in 2010. This is 5% of the U.S. population.

Source:NOAA 2011county_snapshots

293

Persons per square mile residing within the coastal floodplain (excluding Alaska).

Source:NOAA 2011

10%

Percent of the population residing in the coastal floodplain that is below the poverty level (excluding U.S. Territories).

Source: NOAA 2011

21%

Percent of the population residing in the coastal floodplain that is under 5 and 65 and over (excluding U.S. Territories).

Source:NOAA 2011

Alternative content

Get Adobe Flash player

Download Interactive Map and Data (800kb)

Source:NOAA 2011 Note: Interactive map and statistics include U.S. Territories unless otherwise noted.

About this Topic

In this topic, data about population in the coastal floodplain is presented for the time period 1970 to 2010. The population data for this topic was obtained from the Spatial Trends in Coastal Socioeconomics (STICS) database. The data show that there were 16.6 million people residing in the coastal floodplain in 2011 (5% of the U.S. population), or about 293 people per square mile (excluding Alaska). Data is also presented on populations at potentially elevated risk, which shows that for population inside the coastal floodplain, 21 percent is under the age of 5 and age 65 or older and 10 percent is below the poverty line. Also, a Management Success story is presented on Coastal Smart Growth and a Case Study is presented on What is Your County’s Flood Exposure.