U.S. States: Wisconsin: Marathon County
You found some information I didn't have. I lived in Stratford from about 1935 to about 1955, but wasn't of the age of "awareness" until about the start of World War II. My dad was veterinarian in Stratford and his territory covered some of the area you mentioned.
The village of Halder still exists, about half way between Stratford and Mosinee on State Hy. 153. Of course the City of Mosinee still exists. There still are Towns (townships) of Emmett, Mosinee, and of course Green Valley and Bergen.
Again, good luck on your searches.