About
Datum is a directory of public government ArcGIS REST endpoints in the United States. 9,242 endpoints across 5,459 organizations, every state.
Government GIS is published across separate Enterprise portals and ArcGIS Online organizations that share no common index. This is that index.
What is here
Data portals
Catalog pages rather than services. State and metro ones are on each state page.
- Census TIGER/Line www.census.gov
- Data.gov geospatial catalog.data.gov
- NOAA Digital Coast coast.noaa.gov
- The National Map apps.nationalmap.gov
- USGS EarthExplorer earthexplorer.usgs.gov
Attribution and license
This directory was compiled using the List of Federal, State, County and City ArcGIS Servers by Joseph Elfelt (mappingsupport.com) as reference material. That list is copyright © Joseph Elfelt.
Per his terms, this work is free for everyone, and commercial products based on it are prohibited without his specific written permission. Anything derived from this must carry the same notice.
Contributions to this project are released under CC BY-NC 4.0 so they stay compatible with the above.
Datum contributes periodically to the server list via web scraping, targeted searches, and ArcGIS Hub monitoring.
Basemap: USGS shaded relief, public domain. Boundaries: US Census Bureau cartographic boundary files.