Manufacturing Companies in Illinois: 124 Verified Firms
Secwyn has verified 124 manufacturing companies based in Illinois. The largest groups are All Other Plastics Product Manufacturing (15); Machine Shops (8); and Sheet Metal Work Manufacturing (6). By headcount, 75% have 51–200 employees, 19% have 201–500 employees, and 6% fall in other size bands. Elk Grove Village has the most (8), followed by Chicago (7) and Addison (5). Of the 31 whose customers we could confirm, 100% sell to businesses and 6% to consumers.
Company size
- 51–200 employees93 · 75%
- 201–500 employees23 · 19%
- 501–1,000 employees7 · 6%
- 5,000+ employees1 · 1%
Who they sell to, among the 31 companies where we could confirm it: businesses 100%, consumers 6%, government 3%. A company can sell to more than one.
Top cities
- Elk Grove Village8 · 6%
- Chicago7 · 6%
- Addison5 · 4%
- Rockford5 · 4%
- McHenry4 · 3%
- Aurora3 · 2%
- Waukegan3 · 2%
- Wheeling3 · 2%
Cities with fewer than 3 companies are not listed.
Largest sub-industries
| Sub-industry | NAICS | Companies |
|---|---|---|
| All Other Plastics Product Manufacturing | 326199 | 15 |
| Machine Shops | 332710 | 8 |
| Sheet Metal Work Manufacturing | 332322 | 6 |
| Commercial Printing (except Screen and Books) | 323111 | 5 |
| All Other Industrial Machinery Manufacturing | 333248 | 4 |
| Metal Crown, Closure, and Other Metal Stamping (except Automotive) | 332119 | 4 |
| Bolt, Nut, Screw, Rivet, and Washer Manufacturing | 332722 | 3 |
| Construction Machinery Manufacturing | 333120 | 3 |
A sample of these companies
A few of the 124 manufacturing companies in Illinois. Names, websites and contacts are shown after you sign up.
Company #1 · name shown after sign-up
Cutting Tool and Machine Tool Accessory Manufacturing · 51–200 employees
Company #2 · name shown after sign-up
Commercial Printing (except Screen and Books) · 51–200 employees
Company #3 · name shown after sign-up
All Other Miscellaneous Textile Product Mills · 51–200 employees · Chicago
Company #4 · name shown after sign-up
Fluid Power Valve and Hose Fitting Manufacturing · 51–200 employees · Rockford
Company #5 · name shown after sign-up
All Other Industrial Machinery Manufacturing · 51–200 employees · Chicago
Company #6 · name shown after sign-up
Machine Shops · 51–200 employees · Elk Grove Village
Find the Illinois manufacturing companies that fit what you sell
Describe what you sell and Secwyn shows the companies most likely to buy it, with the reasons for each match. Sign up free and your first 3 company reveals are on us: name, website, description with its source, contact channels and the roles to contact.
How Secwyn verifies these companies
- Every company description is a sentence visible on the company's own website. Inside the product, each one links to its source page.
- Each company has a NAICS industry code, the US government standard for classifying businesses.
- All companies are based in the United States. Location and size come from public sources, including company filings and People Data Labs.
Data updated October 6, 2026.