Published May 1, 2025
The Most Flood-Prone Cities in America by Claims Data
Flooding is the most common and costly natural disaster in the United States, causing over $5 billion in NFIP claims annually. Using FEMA OpenFEMA data on National Flood Insurance Program claims, disaster declarations, and payout amounts, we identify the cities and counties where flooding hits hardest and most often.
How We Rank Flood-Prone Cities
Our analysis uses four key metrics from FEMA OpenFEMA data to rank the most flood-prone cities in America: claims density (claims per 1,000 policies), total payout amounts, disaster declaration frequency, and the number of repetitive loss properties. Cities that score high across all four factors represent the highest flood risk in the country.
The Most Flood-Prone Cities
The Gulf Coast dominates the list of America's most flood-prone cities, but flooding is not exclusively a coastal problem. Inland cities along major rivers and cities with aging stormwater infrastructure also rank among the highest-risk locations in the country.
Houston, Texas
Houston consistently ranks as America's most flood-prone major city. Texas leads the nation in total NFIP claims, and Harris County, home to Houston, accounts for a massive share of those claims. The city's flat terrain, clay soils that resist water absorption, and rapid urban sprawl into floodplains create a perfect storm for flooding. Hurricane Harvey in 2017 alone generated over $8.9 billion in NFIP claims in Harris County.
New Orleans, Louisiana
New Orleans sits an average of 6 feet below sea level, surrounded by Lake Pontchartrain and the Mississippi River. Louisiana ranks among the top states for flood risk, and Orleans Parish has one of the highest claims densities in the nation. Despite massive levee and pump investments since Hurricane Katrina, the city remains highly vulnerable to both hurricane storm surge and heavy rainfall flooding.
Miami, Florida
South Florida's low elevation, porous limestone geology, and exposure to Atlantic hurricanes make Miami one of the most flood-prone cities in the country. Florida has more NFIP policies than any other state, reflecting the widespread flood risk across the peninsula. Sea level rise is compounding the problem, with tidal flooding events increasing in frequency along Miami-Dade County's coast.
Baton Rouge, Louisiana
The 2016 Louisiana floods devastated Baton Rouge, producing over $3 billion in flood damage. East Baton Rouge Parish experienced catastrophic flooding when 20-30 inches of rain fell in 72 hours. Many of the affected homes were outside FEMA's designated flood zones, highlighting the limitations of existing flood maps.
Norfolk, Virginia
Norfolk experiences tidal flooding over 10 times per year on average, more than almost any other U.S. city. The combination of land subsidence, sea level rise, and coastal storm exposure creates chronic flood conditions. The Hampton Roads region faces some of the fastest rates of relative sea level rise on the East Coast.
Inland Cities at High Risk
Coastal cities get the most attention, but inland flooding affects millions of Americans. Cities along the Mississippi, Missouri, and Ohio Rivers experience major flood events regularly. Urban areas with inadequate stormwater management infrastructure also face growing flood risk.
Cedar Rapids, Iowa; Nashville, Tennessee; and Pittsburgh, Pennsylvania have all experienced devastating floods in the past two decades. These events produced billions in damage and reshaped local floodplain management policies.
What Makes a City Flood-Prone?
Several factors contribute to a city's flood vulnerability, according to NOAA and USGS research:
- Topography, Low-lying areas and flat terrain allow water to accumulate rather than drain
- Impervious surfaces, Pavement and buildings prevent rainfall from soaking into the ground
- Drainage capacity, Undersized or aging storm sewers cannot handle intense rainfall
- Proximity to water, Rivers, coastlines, and lakes create direct flood exposure
- Soil type, Clay soils resist absorption, increasing surface runoff
Protecting Yourself in a Flood-Prone City
If you live in one of America's most flood-prone cities, taking proactive steps is essential. Check your county's flood risk ranking to understand your local risk level. Consider purchasing NFIP flood insurance even if you are not in a mandatory purchase zone, over 25% of claims come from moderate-risk areas. Review flood mitigation strategies to protect your property before the next storm.
Visit FloodSmart.gov to find an insurance agent and learn more about your flood risk. You can also compare counties on our site to see how your area stacks up against others nationwide.
Frequently Asked Questions
Based on NFIP claims data, Houston, Texas has generated more flood insurance claims than any other U.S. city. Harris County alone accounts for billions of dollars in flood payouts, driven by its flat topography, clay soils, and extensive development in floodplains.
Flood-prone status is determined by analyzing FEMA NFIP claims density (claims per 1,000 policies), total payouts, disaster declaration frequency, and repetitive loss properties. Cities with high values across all four metrics are the most flood-prone.
Yes, many flood-prone cities are experiencing increasing flood risk due to climate change, urban development, and aging infrastructure. FEMA claims data shows a clear upward trend in both the frequency and severity of flooding events over the past two decades.
If you live in a FEMA-designated Special Flood Hazard Area and have a federally backed mortgage, flood insurance is mandatory. However, over 25% of NFIP claims come from outside high-risk zones, so even moderate-risk areas should consider coverage.