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Arcgis Online Open Data (live) ( slow, real time sync with ESRI Server)
Note:
Most of city/county/state host their arcgis portal on domain hub.arcgis.com or opendata.arcgis.com. However, some of organization host their arcgis port other than ESRI arcgis.com (ex: use amazon cloud EC2). Those will NOT show on this listing, but will show on the other listing Esri open data 1000+ organization