Top 19 Injection Molding Manufacturers in Wisconsin 2026

McDonald Plastic Molding, Inc.

Monroe, Wisconsin

McDonald Plastic Molding, Inc. is headquartered in Monroe, Wisconsin, with additional manufacturing facilities in Cuba City and Darlington.

PREMOLD CORP

Oconomowoc, Wisconsin

Premold Corp was founded in 1995 by Ken Schweitz in Oconomowoc, Wisconsin. The privately owned company operates two facilities in Oconomowoc and a third in Monterrey, Mexico.

Vital Plastics, LLC

Baldwin, Wisconsin100+ employees

Vital Plastics, LLC was founded in 1994 in Baldwin, Wisconsin, located east of the Twin Cities metro area along Interstate 94. The company operates two manufacturing facilities in Baldwin and has grown to become a custom plastic injection molding and assembly solutions provider.

Applied Molding Technologies, LLC was founded in 2006 in Frederic, Wisconsin. The shop provides thermoplastic injection molding on all-electric presses ranging from 55 to 850 tons of clamp force, and thermoset compression, transfer, and injection molding on presses from 150 to 300 tons.

Dutchland Plastics

Oostburg, Wisconsin

Dutchland Plastics has operated from Oostburg, Wisconsin since 1967, building a rotational molding business that now spans a nearly 200,000-square-foot facility there and a second plant in Canastota, New York. The firm specializes in high-volume rotational molding of large plastic parts, producing pieces up to 500 pounds and 17 feet long.

Green Bay Plastics

Green Bay, Wisconsin

Green Bay Plastics, Inc. was incorporated in 1957 in Green Bay, Wisconsin, initially as part of Mosinee Paper Corporation.

Intek Plastics

Eau Claire, Wisconsin

Intek Plastics operates from Eau Claire, Wisconsin. The company provides full-spectrum plastic manufacturing, including precision injection molding, multi-material and co-extrusion, plastic prototyping via 3D printing and cast urethane molding, and in-house tooling.

Midwest Precision Molding

Lake Geneva, Wisconsin

The company has provided plastic injection molding services for over 40 years, with CEO Larry Austin the business since at least 2016 when he acquired Tri-Tec Corp. in nearby Darien and expanded the Plasti-Coil building.

New Berlin Plastics was founded in 1975 by William Aukofer and Robert Zeman in New Berlin, Wisconsin. After relocations in 1976 and 1982, the company moved into a 100,000-square-foot facility in 1998 that serves as its headquarters and manufacturing site.

PMC Plastic Molded Concepts

Eagle, Wisconsin

Plastic Molded Concepts (PMC) operates from Eagle, Wisconsin, where it was founded in 1976. The company has spent nearly five decades developing injection molding expertise, focusing on engineered resins for mission-critical components.