Homeland Security’s HIFLD Open data site
Arranged by categories, the Geospatial Management Office hosts public domain data for community preparedness, resiliency, research, and more: Agriculture, Borders, Boundaries, Chemicals, Commercial, Communications, Education, Emergency Services, Energy, Finance, Food Industry, Geonames, Government, LandScan, Law Enforcement, Mail Shipping, Mining, National Flood Hazard, Natural Hazards, Public Health, Public Venues, Transportation Air, Transportation Ground, Transportation Water, and Water Supply.