About Flood Insurance Data

What this is

Flood Insurance Data is an independent, non-commercial project that makes the U.S. government's own flood-insurance records readable one place at a time. For each county we publish what existing NFIP policyholders actually pay, how that compares with FEMA's full-risk price, the claims history, the flood risk, and the community discounts that lower the bill — every figure drawn from a public federal dataset, with its exact source and the date it was pulled.

How the numbers are made and checked

• Compiled directly from FEMA's OpenFEMA APIs and the U.S. Census Bureau — no estimates, no modelled or private data.
• Every page is built by code and must pass an automated correctness gate before it ships: percentiles and sums are recomputed, counts are reconciled to FEMA's official policy figure, every ratio's denominator is disclosed, and nothing publishes if a check fails. The methodology defines every term.
• We show aggregates only — never an individual property, policy, or quote.
• Corrections: a public contact address is being set up; every figure links to its official federal source so any number can be checked against the record it came from.

Independence

This site is not affiliated with or endorsed by FEMA or any government agency, and has no relationship with any insurer, agent, or lead-generation service. It does not sell insurance, generate quotes, or earn commissions on policies. It is a reference, not a sales page. Any advertising, if added later, will be disclosed here.