Top 10 Manufacturing Companies in Iowa - IndustrySelect®
2. John Waterloo Works (Waterloo, IA) A major Iowa industrial employer with 4,200 employees, John Waterloo Works focuses on tractor transmissions, axels, gears. OEM components, chassis parts and tractor assembly. Founded in 1837, & Company now employs 74,412 worldwide with revenues of $37 billion. 3.