Look up USGS protected area pad by state, click here use their official map explorer
https://maps.usgs.gov/padusdataexplorer/#/protected-areas
But how about by county?
https://transparentgov.net/json2tree/datahub.io/hrsa/bycounty.html?backgroundlayerurl=https%3A%2F%2Fgis.usgs.gov%2Fpadus%2Frest%2Fservices%2Fpadus3%2FManager_Type%2FMapServer%2F0&select_level1value=6&select_level2value=6
https://transparentgov.net/json2tree/esri/server/folder.html?url=https%3A%2F%2Fgis.usgs.gov%2Fpadus%2Frest%2Fservices&org=USGS+Protected+Areas+PAD%2C%26nbsp%3B%26nbsp%3B&cross=default&timeout=10000&select_folder=11&select_layer=0
You can change layer by click button
Warning: USGS Pad arcgis server have not support CORS yet, how to enable CORS on your Arcgis Server click here
https://developers.arcgis.com/javascript/latest/cors/
choose 'tile', it is 10 times faster than 'image'
https://transparentgov.net/json2tree/datahub.io/hrsa/bycounty.html?backgroundlayerurl=https%3A%2F%2Fgis.usgs.gov%2Fpadus%2Frest%2Fservices%2Fpadus3%2FManager_Type%2FMapServer%2F0&select_level1value=6&select_level2value=6&backgroundtype=tile