- M. Barrows & company (Boston) (1)
- Malleable Iron Range Co (Beaver Dam, Wis, 1925) (1)
- Methodis Episcopal Church (Fonda Iowa) (1)
- Minneapolis Public Schools, Cooking Department (Minneapolis, Minnesota) (1)
- Minnesota Extension Service, University of Minnesota; St. Paul, Minnesota (14)
- Minnesota Macaroni Co (St. Paul, Minn) (1)
- Minute Tapioca Co (Orange, Mass, 1915) (1)
- Monon Printing Co (Monon, Indiana) (1)