Very late response, but maybe it will help. As far as I understand it, East Tawas would be the mailing address for all the places you mentioned. If you look up East Tawas on mapquest, it shows you a pinpoint on Bay street. Baldwin Township would be just north of that along Wilber Rd/ Old US 23, and Wilber's southern border is Galion Road I believe. If you are interested, I have access to platt books (not sure how far back, but it will help with the borders) and we probably had some family in the area around the same time. Let me know if I can help further!