The National Risk Index is a dataset and online tool to help illustrate the U.S communities most at risk for natural hazards. The Index leverages available source data for 18 natural hazards, social vulnerability, and community resilience to develop a baseline relative risk measurement for each U.S county and Census tract.

Do you need help with the National Risk Index? Check out our Frequently Asked Questions, or review and follow the links below.

• Use the National Risk Index Data Lookup
• What is the National Risk Index?
• How do I use the map and reporting tools?
• Why should I use the National Risk Index? / What can it help with?
• How is risk determined?

• What are the components used to calculate the National Risk Index?

  • Expected Annual Loss
  • Social Vulnerability
  • Community Resilience
• How are all the terms used in the National Risk Index defined?
• What do the scores and ratings mean, and how do I interpret them?
• How can I download the data?
• How was the National Risk Index developed?

Can't find the help you're looking for? Visit our Contact Us page and send your question(s) to the National Risk Index Team.