My Durr ancestors are from Co. Roscommon, Ireland. We think they emigrated first to Wisconsin before settling in northern Illinois. Durr (with an umlaut) is also a German surname, so I'm not sure if this is even the same family. I should be receiving some information from the genealogical society in Lee Co., IL soon, so will post that information. If you are indeed looking for the Irish Durr name, I'll let you know if I find a connection with your information. I know how frustrating the search can be.