If you go to the following URL you can see the present Middlesex Twp in Butler County. From this page you can also click on Old Township Lines to see the old Butler County Townships. http://www.rootsweb.com/~pabutler/edmcclel/ If you go to this URL for Mercer County and click on Shenango Twp you can see the Borough of West Middlesex. http://www.rootsweb.com/~pamercer/mercmaps/ Ed McClelland, Alexandria, Virginia.