Official tool is here
https://data.hrsa.gov/tools/rural-health?tab=StateCounty
Better tool is here
https://transparentgov.net/json2tree/esri/server/folder.html?org=https%3A%2F%2Fgisportal.hrsa.gov%2Fserver%2Frest%2Fservices&url=https%3A%2F%2Fgisportal.hrsa.gov%2Fserver%2Frest%2Fservices&select_folder=118&select_layer=1
Example 1
Rural health + By county
https://transparentgov.net/json2tree/datahub.io/hrsa/bycounty.html?backgroundlayerurl=https%3A%2F%2Fgisportal.hrsa.gov%2Fserver%2Frest%2Fservices%2FAnalyzerTool%2FAnalyzerTool%2FMapServer%2F0&layer=Rural+Health+Area&_center_zoom=11&_center_lat=28.859263826249556&_center_long=-82.47285839999995&select_level1value=11&select_level2value=8
Example 2
Rural health + By address
https://transparentgov.net/json2tree/datahub.io/hrsa/byaddress.html?backgroundlayerurl=https%3A%2F%2Fgisportal.hrsa.gov%2Fserver%2Frest%2Fservices%2FAnalyzerTool%2FAnalyzerTool%2FMapServer%2F0&_center_zoom=13&_center_lat=30.12697234655939&_center_long=-95.49481815689214&layer=Rural+Health+Area&search=24776+hidden&select_level2value=5