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Name Description
HU02 Two-digit Hydrologic Regions
HU04 Four-digit Hydrologic Subregion
HU06 Six-digit Hydrologic Basins
HU08 Eight-digit Hydrologic Subbasins
HU10 Ten-digit Watersheds
National Aquifers National Aquifers of the United States
Reference Gages US Reference Stream Gage Monitoring Locations
States U.S. States
Counties U.S. Counties
American Indian/Alaska Native Areas/Hawaiian Home Lands (AIANNH) Native American Lands
Core-based statistical areas (CBSA) U.S. Metropolitan and Micropolitan Statistical Areas
Urban Areas Urbanized Areas and Urban Clusters (2010 Census)
Places U.S. legally incororated and Census designated places
Public Water Systems U.S. Public Water Systems