for administrative boundaries, you can often download official boundaries from government GIS open data portals. in the case of Clinton Township, NJ, you can get such boundaries from NJ’s state GIS portal. here’s the relevant dataset, filtered for the particular township: https://njogis-newjersey.opendata.arcgis.com/datasets/a1b13541f0484415b06cf9c8969bfd6c_0/explore?filters=eyJNVU4iOlsiQ0xJTlRPTiBUV1AiXX0%3D.
you should be able to export KML from here with just a few clicks:
