SIC 4491 — Marine Cargo Handling
Description & Classification
SIC code 4491 representing 'Marine Cargo Handling' is an industry category in the Standard Industrial Classification (SIC) system under U.S. OSHA and Federal procurement registers.
Modern NAICS Crosswalk
Trace the modern equivalent classifications in the 2022 North American Industry Classification System (NAICS) database:
- NAICS 488320 - Marine Cargo Handling (via SIC1987:4491→NAICS1997:48832→2002:488320→2007:488320→2012:488320→2017:488320→2022:488320)
- NAICS 488310 - Port and Harbor Operations (via SIC1987:4491→NAICS1997:48831→2002:488310→2007:488310→2012:488310→2017:488310→2022:488310)
Classification Details
| SIC Code | 4491 |
|---|---|
| Industry Title | Marine Cargo Handling |
| Division | Division E: Transportation, Communications, Electric, Gas, and Sanitary Services |
| Major Group | Major Group 44: Water Transportation |
| Source / Verified | US Census 1987 SIC Concordance / 2026-06-28 |
Related Resources & Compliance Guides
Further regulatory reference links for legacy SIC code 4491:
- SIC Codes Complete Compliance Guide — Detailed history and active legal applications of the SIC classification framework.
- Why Legacy SIC Codes Persist Guide — How credit systems and the SEC still rely on SIC metadata.
- SIC ↔ NAICS Crosswalk Tool — Trace industrial code conversions dynamically.
- SIC Major Group 44 Hub — View other legacy industries in this business division.
Related Industries in Major Group 44
Frequently Asked Questions (FAQ)
What industry does SIC code 4491 represent?
SIC 4491 is 'Marine Cargo Handling', a 4-digit Standard Industrial Classification (SIC) code under Major Group 44: Water Transportation (Division E: Transportation, Communications, Electric, Gas, and Sanitary Services); it maps to modern 2022 NAICS code(s): 488320 (Marine Cargo Handling), 488310 (Port and Harbor Operations).
What is the modern 2022 NAICS mapping for SIC 4491?
SIC code 4491 maps to modern NAICS codes: 488320 - Marine Cargo Handling, 488310 - Port and Harbor Operations.