Primary Metal Manufacturing in Illinois

NAICS 331 · IL

This register lists 550 facilities in Illinois. The Bureau of Labor Statistics counted 336 establishments in the Primary Metal Manufacturing industry in Illinois in 2025. Mapleton Foundry in Mapleton employed 1,186 people in 2025.

SUMMARIZED FROM THE FEDERAL FIGURES ON THIS PAGE

Plants in Illinois11 FACILITIES

Listing 11 of 15: the facilities with a website, a size band or two sources on record. The rest are in site search.

Facility	City	Employees	Status
CACustom Aluminum Products	Genoa	100–499	● ACTIVE
UWUnified Wire and Cable, INC.	Dekalb	20–99	◐ LIKELY ACTIVE
DCDuro Cast INC	Somonauk	20–99	◐ LIKELY ACTIVE
NENehring Electrical Works/Conex Cable	Dekalb	100–499	◐ LIKELY ACTIVE
ESElgiloy Specialty Metals	Sycamore	—	◐ LIKELY ACTIVE
NENehring Electrical Works CO	Dekalb	—	◐ LIKELY ACTIVE
CCConex Cable LLC	Dekalb	20–99	◇ UNVERIFIED
DCDuro Cast	Somonauk	20–99	◐ LIKELY ACTIVE
NENehring Electric	Dekalb	—	◐ LIKELY ACTIVE
WIWest Irving Die INC	Sandwich	—	◇ UNVERIFIED
Combined Metals Company LLC - Sycamore	Sycamore	20–99	◐ LIKELY ACTIVE

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