Flood map data
FEMA’s National Flood Hazard Layer supplies effective digital flood zones, map panels and letters of map change where available. The official Map Service Center supplies the FIRMette and related map products. An unavailable digital response is shown as unavailable.
Insurance statistics
FEMA’s FloodSmart agent resource publishes the HUDEX policy-and-loss geography workbook and the NFIP zone workbook. Both snapshots on this site are dated August 31, 2026. The raw workbooks are retained in the local research directory, and import scripts provide a reproducible transformation.
Address and geographic data
The Census Geocoder returns address matches and county geography. The 2025 Gazetteer supplies county and place internal points. The 2024 Census population estimates rank the launch city pages; the national place-code list identifies counties.
Definitions and rules
Zone meanings are checked against FEMA map-reading training and official flood-zone guidance. Insurance requirements, the waiting period, elevation certificates and letters of map change are linked to FEMA and FloodSmart guidance.