Official tool is here, you have to type full address, then click search button at bottom
https://data.hrsa.gov/tools/rural-health?tab=StateCounty
You can do the same with much easier way here
Step 1: type an address
https://transparentgov.net/json2tree/datahub.io/usgs/where_is_what_image.html?backgroundlayerurl=https%3A%2F%2Fgisportal.hrsa.gov%2Fserver%2Frest%2Fservices%2FAnalyzerTool%2FAnalyzerTool%2FMapServer%2F0&layer=Rural+Health+Area&_center_zoom=4&_center_lat=50.407487258042956&_center_long=-88.21712762955262
Step 2: result is automatically showing
https://transparentgov.net/json2tree/datahub.io/usgs/where_is_what_image.html?backgroundlayerurl=https%3A%2F%2Fgisportal.hrsa.gov%2Fserver%2Frest%2Fservices%2FAnalyzerTool%2FAnalyzerTool%2FMapServer%2F0&layer=Rural+Health+Area&_center_zoom=15&_center_lat=34.2539062742527&_center_long=-117.27617300005518
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=106&select_layer=0&arcgis_online_token=
Results is here