NAICS 331

Primary metal manufacturing

The BLS counted 220 private primary metal manufacturing establishments across the nine counties on this site in 2024. Cook County, IL had the most (109), while Lake County had the most disclosed jobs (9,664). Mills and foundries move heavy metal on runners, skids and heavy-duty pallets, many of them built to order.

220

Establishments, nine counties (2024)^[1]

22,711

Jobs in the 8 counties where the BLS discloses them^[1]

Cook

County with the most establishments^[1]

Primary metal manufacturing by county, 2024 annual averages (private)
County	Establishments	Jobs	Share of county private jobs
Cook County, Illinois	109	5,897	0.3%
DuPage County, Illinois	30	612	0.1%
Kane County, Illinois	20	1,060	0.6%
Lake County, Illinois	13	176	0.1%
McHenry County, Illinois	11	398	0.5%
Will County, Illinois	11	183	0.1%
Kendall County, Illinois	1	not disclosed	n/a
Lake County, Indiana	16	9,664	5.7%
Porter County, Indiana	9	4,721	8.3%

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Sources

BLS Quarterly Census of Employment and Wages, 2024 annual averages. Private ownership. Establishment counts and average employment by county and NAICS industry. Employment the BLS withholds for confidentiality is shown as not disclosed.

Last reviewed 2026-10-27. Not legal advice and not a price quote. See how the figures are built.