Arcgis Server
https://public.gis.lacounty.gov/public/rest/services
Everything
https://transparentgov.net/json2tree/esri/server/folder.html?org=https%3A%2F%2Fpublic.gis.lacounty.gov%2Fpublic%2Frest%2Fservices&url=https%3A%2F%2Fpublic.gis.lacounty.gov%2Fpublic%2Frest%2Fservices&arcgis_online_token=&timeout=9000&select_folder=29&select_layer=&select_folder_text=Open_Data+%3Csup%3EMapServer%3C%2Fsup%3E&select_layer_text=25+%26%23x21E2%3B+School+Districts+%3Csup%3EFeature+Layer%3Csub%3E+esriGeometryPolygon%3C%2Fsub%3E%3C%2Fsup%3E
Just the boundadry
https://public.gis.lacounty.gov/public/rest/services/LACounty_Dynamic/Political_Boundaries/MapServer/
https://transparentgov.net/json2tree/esri/server/folder.html?org=https%3A%2F%2Fpublic.gis.lacounty.gov%2Fpublic%2Frest%2Fservices%2FLACounty_Dynamic%2FPolitical_Boundaries%2FMapServer%2F&url=https%3A%2F%2Fpublic.gis.lacounty.gov%2Fpublic%2Frest%2Fservices%2FLACounty_Dynamic%2FPolitical_Boundaries%2FMapServer%2F&arcgis_online_token=&timeout=9000&select_folder=1&select_layer=
Arcgis online
https://data.lacounty.gov/search
https://services.arcgis.com/RmCCgQtiZLDCtblq/arcgis/rest/services
Due to very large amount of data on this REST api endpoint, you need to increase the response time limit from 1 second to 9 sec
https://transparentgov.net/json2tree/esri/server/folder.html?org=https%3A%2F%2Fservices.arcgis.com%2FRmCCgQtiZLDCtblq%2Farcgis%2Frest%2Fservices&url=https%3A%2F%2Fservices.arcgis.com%2FRmCCgQtiZLDCtblq%2Farcgis%2Frest%2Fservices&arcgis_online_token=&timeout=9000
Public work arcgis server
https://dpw.gis.lacounty.gov/dpw/rest/services/PW_Open_Data/MapServer
Note this public work arcgis server is not visible due to gis admin limit same origin.
https://transparentgov.net/json2tree/esri/server/folder.html?org=https%3A%2F%2Fdpw.gis.lacounty.gov%2Fdpw%2Frest%2Fservices%2FPW_Open_Data%2FMapServer&url=https%3A%2F%2Fdpw.gis.lacounty.gov%2Fdpw%2Frest%2Fservices%2FPW_Open_Data%2FMapServer&arcgis_online_token=&timeout=9000&select_folder=1&select_layer=43&select_folder_text=PW_Open_Data+%3Csup%3EMapServer%3C%2Fsup%3E&select_layer_text=43+%26%23x21E2%3B+eGIS_Boundaries_Political.EGIS.DPW_CITY_BOUNDARIES+%3Csup%3EFeature+Layer%3Csub%3E+esriGeometryPolygon%3C%2Fsub%3E%3C%2Fsup%3E
Los Angeles County eGIS Hub
https://transparentgov.net/json2tree/esri/online/hub.html?url=https%3A%2F%2Fegis-lacounty.hub.arcgis.com&org=Los+Angeles+County+CA+enterprise+eGIS+Hub&_center_lat=34.049039&_center_long=-118.246521&_center_zoom=17&filter_by=
Los Angeles County emergency Hub
https://transparentgov.net/json2tree/esri/online/hub.html?url=https%3A%2F%2Femergency-lacounty.hub.arcgis.com&org=Los+Angeles+County+CA+Emergency+Hub&_center_lat=34.049039&_center_long=-118.246521&_center_zoom=17&filter_by=
Other Los Angeles County GIS
https://transparentgov.net/json2tree/esri/arcgisServerList.html?filter_by=angeles+county