International Union of Operating Engineers Local 139 Email Format
ConstructionWisconsin, United States51-200 Employees
The International Union of Operating Engineers Local 139 is a mid-sized labor union in the Wisconsin construction sector. Founded in 1902, it represents more than 10,000 skilled equipment operators and service technicians across the state. The organization is based in Pewaukee and maintains district offices in Madison, Appleton, and Altoona (near Eau Claire), along with a state-certified training school in Coloma. It supports its members through apprenticeship programs administered at the Coloma training center, and offers pre-apprenticeship pathways for high school students through Destinations Career Academy. These programs are part of its broader effort to develop Wisconsin's skilled labor for construction work.