Manufacturing capacity for King County, WA

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

The Census counts 141 establishments in King County across the classes this site tracks.

plastics product plants: 27
machine shops: 80
sheet metal shops: 27
tool and die shops: 4
people employed: 3,378

How this compares to Washington

King County141
Washington580

How this compares to Washington

Washington overall: 580 establishments across the five classes, of which machine shops are the largest. King 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 King County, WA the custom manufacturing establishments was 141.

Cite as: "Injection Molding Cost Checker Capacity Index: King County, WA", updated 2026-09-09, https://injectionmoldingcostchecker.com/capacity/washington/king-county-wa/.

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Custom manufacturing establishments · King County, WA · 2022

141

manufacturing establishments	3,378

Source: Injection Molding Cost Checker Capacity Index: King County, WA

<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; King County, WA &middot; 2022</figcaption><p style="margin:0;font-size:26px;font-weight:700;color:#0f172a;background:#ffffff;">141<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;">3,378</td></tr></tbody></table><p style="margin:12px 0 0;font-size:12px;color:#64748b;background:#ffffff;">Source: <a href="https://injectionmoldingcostchecker.com/capacity/washington/king-county-wa/#stats" style="color:#2563eb;background:#ffffff;text-decoration:underline;">Injection Molding Cost Checker Capacity Index: King County, WA</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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