Manufacturing capacity for St. Clair County, MI

Name: Injection Molding Cost Checker Capacity Index: St. Clair County, MI
Creator: Injection Molding Cost Checker
Published: 2026-09-09
License: https://injectionmoldingcostchecker.com/terms

The Census counts 42 establishments in St.

Clair County across the classes this site tracks.

plastics product plants: 10
machine shops: 23
tool and die shops: 9
people employed: 1,246

How this compares to Michigan

St. Clair County42
Michigan1,939

How this compares to Michigan

Michigan overall: 1,939 establishments across the five classes, of which machine shops are the largest. St. Clair County sits below the state's typical county for these classes.

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Sources, citation and related pages

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In St. Clair County, MI the custom manufacturing establishments was 42.

Cite as: "Injection Molding Cost Checker Capacity Index: St. Clair County, MI", updated 2026-09-09, https://injectionmoldingcostchecker.com/capacity/michigan/st-clair-county-mi/.

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Custom manufacturing establishments · St. Clair County, MI · 2022

manufacturing establishments	1,246

Source: Injection Molding Cost Checker Capacity Index: St. Clair County, MI

<figure style="margin:0;max-width:340px;padding:16px 18px;border:1px solid #e2e8f0;border-radius:10px;background:#ffffff;color:#0f172a;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;line-height:1.4;"><figcaption style="margin:0 0 6px;font-size:11px;letter-spacing:.04em;text-transform:uppercase;color:#64748b;background:#ffffff;">Custom manufacturing establishments &middot; St. Clair County, MI &middot; 2022</figcaption><p style="margin:0;font-size:26px;font-weight:700;color:#0f172a;background:#ffffff;">42<span style="font-size:14px;font-weight:400;color:#64748b;"></span></p><table style="width:100%;border-collapse:collapse;margin:10px 0 0;font-size:13px;background:#ffffff;border:0;"><tbody style="background:#ffffff;"><tr style="background:#ffffff;"><th scope="row" style="text-align:left;font-weight:400;color:#64748b;background:#ffffff;border:0;padding:3px 0;">manufacturing establishments</th><td style="text-align:right;font-weight:600;color:#0f172a;background:#ffffff;border:0;padding:3px 0;">1,246</td></tr></tbody></table><p style="margin:12px 0 0;font-size:12px;color:#64748b;background:#ffffff;">Source: <a href="https://injectionmoldingcostchecker.com/capacity/michigan/st-clair-county-mi/#stats" style="color:#2563eb;background:#ffffff;text-decoration:underline;">Injection Molding Cost Checker Capacity Index: St. Clair County, MI</a></p></figure>

Source: US Census Bureau, County Business Patterns 2022 (state file, all legal forms of organisation)

www2.census.gov ()

Methodology: Establishment, employment and annual payroll counts for the five NAICS classes this hub's processes are counted in, read from the Census Bureau's keyless County Business Patterns state file for 2022. No NAICS class means 'injection moulding shop', so every class is labelled with its Census name and never with a process name: 326199 is All Other Plastics Product Manufacturing, the class injection moulders share with other plastics converters. Machine Shops (332710) and Sheet Metal Work Manufacturing (332322) publish for all 50 states; Special Die and Tool (333514) and Metal Stamping (332119) are suppressed in smaller states and their absence is recorded rather than filled. Payroll is Census annual payroll in thousands of dollars. This index counts CAPACITY, not vendors we have any relationship with.

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