Manufacturing in St. Clair County, Illinois
This register lists 313 facilities in St. Clair, Illinois. The Bureau of Labor Statistics counted 156 establishments in St. Clair in 2025.
SUMMARIZED FROM THE FEDERAL FIGURES ON THIS PAGE
Map, cities and benchmark
Biggest cities
Federal labor statistics counted at least 156 manufacturing establishments in St. Clair County in 2025, employing about 4,092 people, counting only the industry subsectors the Bureau of Labor Statistics discloses at this level. This registry lists 313.
Facilities6 FACILITIES
Listing 6 of 13: the facilities with a website, a size band or two sources on record. The rest are in site search.
| Facility | City | Industry | NAICS | Employees | Status |
|---|---|---|---|---|---|
| Martin Steel Fabrication, INC. | Mascoutah | Fabricated Metal Product Manufacturing | 332312 | 1–19 | ACTIVE |
| Avmats Midamerica, LLC | Mascoutah | Fabricated Metal Product Manufacturing | 332812 | — | ACTIVE |
| Wehmeyer Seed Company | Mascoutah | Miscellaneous Manufacturing | 339999 | — | LIKELY ACTIVE |
| Boeing CO Bldg 850 & 858 | Mascoutah | Transportation Equipment Manufacturing | 336411 | — | LIKELY ACTIVE |
| Boeing CO | Mascoutah | Transportation Equipment Manufacturing | 336411 | — | UNVERIFIED |
| Kilian Corporation | Mascoutah | Nonmetallic Mineral Product Manufacturing | 327320 | 20–99 | UNVERIFIED |
