I found Prairie Township, Washington County, Arkansas at the following location http://www.city-data.com/township/Prairie-Washington-AR.htmlhttp://www.city-data.com/township/Prairie-Washington-AR.html It showed Prairie township to be on Highway 112. That web address showed a map with the location. All I did was go to www.google.com and type in Prairie Township, Washington County, Arkansas. I have found several obscure townships by doing that. Good luck.