Put the source to work.
Translate industry labels between U.S. and international classification systems. Use the ISIC-to-NAICS mappings to organize your research while you check the actual work behind each code.
Why it matters
Two partners may describe similar work with different codes. A classification bridge helps organize that conversation without assuming every code has an exact one-to-one match.
Do the two industry labels mean the same work?
Imagine a U.S. company and an international partner describe similar work with different industry codes. A crosswalk helps them translate the labels. A shared code makes the research easier to organize. The actual products, skills, and customer needs still decide whether the firms fit.
The source connects ISIC industry anchors with NAICS mapping rows. Some relationships run from one code to several others. Use the supplier guide and the customer guide to explain the real business behind a classification. A code match can guide a search, while a sample or capability review tests fit.
Three steps you can take
- Identify the classification system and version used by each source.
- Review one-to-many mappings before adding counts or revenue, so the same activity is counted once.
- Describe the product or service in plain words alongside its code.
Read the source: United Nations Statistics Division: ISIC. This reference explains the source or research context; the inventory figures below come from the reviewed NDS package.
Know what you are looking at.
- ISIC industry anchors
- 419
- ISIC-to-NAICS mapping rows
- 1,706
- Master rows without an observed NAICS match
- 2
Use these figures to understand the package reviewed on October 20, 2026. The results section below tells you which comparisons you can explore here and which still need source work. A source guide is different from a complete table of published observations.
How to use the evidence
Preserve one-to-many and many-to-many mapping relationships.
Use explicit aggregation controls so a business or measure is not counted several times because it has several mapping rows.
Find the same industry
across different systems.
A U.S. business may use a NAICS code. An international record may use ISIC or NACE. The crosswalk helps connect those labels so you can research comparable business types.
Search the NAICS ↔ ISIC industry mappings →
| Bridge | Source rows |
|---|---|
| ISIC Rev.4 → NAICS 2022 | 1,706 |
| ISIC Rev.4 → NACE Rev.2.1 | 904 |
| ISIC Rev.4 → ISIC Rev.5 | 611 |
| ISIC Rev.4 master classes | 419 |
Put the bridge to work. Start with the business’s recorded industry code, follow the source mapping, then look for customers, complementary suppliers, and institutions in the target place. A classification match tells you what type of work a business does; the demand and partner evidence comes from the records you connect next.
Mapping notes and source status
The older README says NAICS is pending. The actual uploaded tables contain 1,706 NAICS mappings and agree across all four formats. Option A identifies the U.S. Census concordance as its source; Options B and C identify the ENCORE May 2026 crosswalk.
Mappings can have several branches. Keep source notes and group-level qualifications. Use the row-level mapping table to keep codes with their correct titles. Do not give a business extra weight because it maps to several industries.
Two master classes, 9810 and 9820, have no observed NAICS match. One supplied mapping carries ISIC code 0331, outside the 419-class master; it remains a source review item and has not been reassigned by guesswork.
No business joins or industry opportunity scores are claimed from the crosswalk alone. The review verifies consistency between supplied formats, not an independent certification of every source mapping.
Available results and rankings
- The reviewed crosswalk supports industry interpretation and the design of international industry comparisons.
- The additional NDS Industry Classification Authority V1.0.2 records certified source status, 3,213 governed mapping edges, and 2,542 codes. Its 6,426 directional rows include forward and reverse views of those edges.
Coverage and limits
- A classification match is not evidence of customer demand, an active supply chain, or successful trade.
- Two master rows lack an observed NAICS match.
Other source guides
Commercial Diplomacy Index™ · National Data System · Source and method guide · October 20, 2026