Understanding Natural Disaster Risk by County

Natural disasters are not evenly distributed across the United States. Some counties face annual threats from multiple hazard types — hurricanes, floods, tornadoes, wildfires, and earthquakes — while others experience almost none. Understanding your county's risk profile is essential for making informed decisions about where to live, what insurance to carry, and how to prepare.

Using data from FEMA's National Risk Index, we analyzed natural disaster risk for all 3,100+ US counties. The results reveal dramatic geographic patterns: Los Angeles County, California ranks as one of the highest-risk counties in the nation, while counties in the northern Great Plains face minimal exposure to nearly every hazard type.

The Geography of Natural Disaster Risk

Natural disaster risk in the US follows clear geographic patterns. The Gulf Coast and Southeast face the highest composite risk due to overlapping hurricane, flood, and tornado exposure. The West Coast carries significant earthquake and wildfire risk. The Great Plains corridor experiences severe tornado and hail events.

The highest-risk states by county representation are California (10 of top 20), Texas (3 of top 20), Florida (2 of top 20), Illinois (1 of top 20), Arizona (1 of top 20). These states share a common characteristic: exposure to multiple hazard types simultaneously. A county in Louisiana, for example, may face hurricane, flood, and tornado risk — compounding the overall threat.

Top 20 Highest-Risk Counties in the US

These counties have the highest composite risk scores in the FEMA National Risk Index, meaning they face more natural hazard exposure, higher expected losses, and greater social vulnerability than nearly all other US counties.

Why Some Counties Face Higher Risk

Composite risk scores are driven by three factors: hazard exposure (how often and how severely natural disasters strike), expected annual loss (the dollar value of projected damage), and social vulnerability (how well-equipped the population is to withstand and recover from events).

High-risk counties typically combine multiple hazard exposures with dense populations and aging infrastructure. Coastal counties face compound risks from hurricanes and flooding. Counties in Tornado Alley experience frequent severe weather events. Western counties in the wildland-urban interface face growing wildfire threats as development pushes into fire-prone areas.

The Lowest-Risk Counties

At the other end of the spectrum, the lowest-risk counties in America cluster in the northern Great Plains and parts of New England. These areas experience few hurricanes, minimal earthquake activity, low wildfire exposure, and infrequent flooding.

Counties like Loving County, Texas have composite risk scores near the bottom of the national distribution. For people who prioritize safety from natural disasters in their relocation decisions, these counties represent the lowest-risk options available.

How to Use This Data

Risk scores are relative rankings, not absolute predictions. A high risk score does not mean a disaster will occur this year — it means the county has historically faced more hazard exposure, higher expected losses, and greater vulnerability than most other US counties.

• Home buyers: Compare risk scores between counties you are considering. Higher-risk counties may require additional insurance coverage (flood, wind, earthquake).
• Homeowners: Review your county's individual hazard scores to ensure you carry appropriate insurance. Many standard homeowner policies exclude flood and earthquake damage.
• Emergency preparedness: Focus your planning on the specific hazard types that score highest in your county. A county with high tornado risk requires different preparation than one with high earthquake risk.
• Insurance decisions: Risk scores correlate with insurance costs. Understanding your county's risk profile helps you evaluate whether your coverage is adequate and competitively priced.

Methodology

Risk data comes from the FEMA National Risk Index (NRI), a publicly available dataset that scores every US county on natural hazard risk. Scores on RiskByCounty use percentile-rank methodology — a county scoring 95 faces more natural disaster risk than 95% of all US counties. Individual hazard scores (flood, wildfire, tornado, earthquake, hurricane) are percentile ranks within each hazard category. The composite risk score incorporates all 18 FEMA hazard types, expected annual loss, social vulnerability, and community resilience.