20240215 15045500 1.0 TRUE 150000000 5000 ItemDescription Governmental Unit Boundaries USGS. Data Refreshed January, 2025. Selectable Polygons web feature service (WFS) for certain Governmental Unit boundaries, Map Index boundaries, and Hydrologic Unit boundaries. See https://apps.nationalmap.gov/help/ for assistance with The National Map viewer, download client, services, or metadata. map indices index reference grid 1x1 degree 30x60 minute 100K 1:100 000 15 minute 63K 1:62 500 7.5 minute 24K 1:24 000 3.75 minute United States US NGP-TNM REST WFS 20241213