Manufacturers in Wisconsin: cheese, paper, machinery and the most factory-heavy workforce in the US

This report is for buyers looking for a Wisconsin supplier, people researching or choosing a manufacturing employer in the state, and B2B sellers covering Wisconsin. It gives the federal count, the three industries that make Wisconsin distinctive, the regional split, the public companies based here and a worked plan for the dairy plants. For the Milwaukee area in detail, see manufacturers in Milwaukee.

Wisconsin manufacturing at a glance

Census County Business Patterns (CBP), 2023, manufacturing (NAICS 31 to 33) in Wisconsin:

Ranking the CBP state file ourselves, Wisconsin is eighth by manufacturing employees and first by manufacturing's share of private-sector jobs (18.2%, against 8.8% nationally; Indiana is second at 17.9%). The Wisconsin Economic Development Corporation (WEDC), using a different dataset (Lightcast, fourth quarter of 2025), counts more than 8,900 manufacturing companies and more than 470,000 manufacturing jobs, and ranks the state first for manufacturing employment per capita.

What makes Wisconsin different

Cheese and dairy

Food is Wisconsin's largest manufacturing employer. Within it, 228 dairy product plants employ 28,286 people, and 176 of those are cheese plants with 22,740 employees. That's 31.8% of the 553 cheese plants in the US and 37.8% of cheese manufacturing jobs; California, next, has 56. Meat and poultry processing adds 135 plants and 18,089 jobs. Dairy plants average 124 employees, large enough to have maintenance, quality and sanitation teams of their own.

Paper in the Fox Valley

Wisconsin has 200 paper plants with 26,617 employees: 31 pulp, paper and paperboard mills and 169 converted paper product plants (boxes, bags, tissue and other products made from purchased paper). Three Fox River counties, Brown (Green Bay), Outagamie (Appleton) and Winnebago (Oshkosh), have 76 of the paper plants and 12,341 of the jobs.

Machinery and electrical equipment

Machinery employs 61,414 people in 942 plants, and electrical equipment and appliance plants are the largest of any Wisconsin subsector, averaging 143.6 employees. Inside that group, 81 electrical equipment plants (motors, generators, switchgear and controls) employ 13,070.

Where the plants are

The Milwaukee area (Milwaukee, Waukesha and Washington counties) has 2,013 plants, 24% of the state. The Fox Valley and lakeshore counties (Brown, Outagamie, Winnebago, Sheboygan) add 1,264, and their plants are bigger: Winnebago and Sheboygan average about 90 employees. The other 64 counties with manufacturing hold about 5,200 plants between them, so a Wisconsin territory is never just its cities.

Plant size

Banded, Wisconsin has 4,826 plants under 20 employees, 2,432 from 20 to 99 and 1,221 at 100 or more. The count is of establishments with paid employees: each plant counts separately, head offices are classified as offices, and owner-only shops are excluded. Employment is for the week of March 12, 2023.

Public manufacturers headquartered in Wisconsin

Wisconsin is the business address of 28 listed companies with manufacturing SIC codes in SEC EDGAR. Here are the ten with the most revenue, with headquarters and revenue taken from each company's latest 10-K:

Revenue is company-wide. WEDC also names private manufacturers among the state's advanced manufacturing employers, including Ariens, Menasha Corporation, Milwaukee Tool, SC Johnson, Schreiber and Waupaca Foundry.

Finding Wisconsin manufacturers by name

Selling to Wisconsin manufacturers

Each cluster buys differently. Dairy and meat plants run around the clock with sanitation shifts, so maintenance and food safety vendors sell to the plant manager and the quality lead. Paper mills plan big maintenance outages well ahead. Machinery and electrical plants in the southeast behave like the metalworking shops of the Midwest: engineering-led, with purchasing at the larger sites.

Worked example: a clean-in-place validation service for dairy plants

Illustrative example. The business and its numbers are invented to show the method; the plant counts are from CBP.

Kettle Moraine Sanitation (kettlemoraine.example) tests and documents clean-in-place systems in dairy plants.

• Wisconsin dairy product plants: 228, averaging 124 employees.
• Kettle Moraine assumes three in four have their own CIP systems and a quality team worth calling: about 171.
• Two contacts each (plant manager and quality or sanitation lead) is 342 people; a 7% reply rate gives about 24 conversations, and one trial per four conversations, 6 plants.

The time goes on finding which plants are adding capacity or changing products. Bebop can search for "Wisconsin cheese and dairy plants with 50 to 499 employees that announced an expansion or are hiring a sanitation supervisor" and research each one.

Subject: CIP records before [Company]'s next audit

Hi [first name],

I saw [Company] is [expanding the [town] plant / adding a new line]. New lines are where clean-in-place cycles drift out of validation without anyone noticing.

We test and document CIP circuits for Wisconsin dairy plants and leave you audit-ready records. Would a one-day check in [month] help?

[Your name], Kettle Moraine Sanitation

Next step: compare these companies with the national leaders in the largest manufacturing companies.