When you want to target “manufacturing” or “financial services,” you need a consistent way to define what those industries actually contain. That’s the job of standardized industry classification codes — and the two you’ll meet most often are SIC and NAICS.
The difference in brief
SIC (Standard Industrial Classification) is the older four-digit system, still widely used and embedded in many legacy databases. NAICS (North American Industry Classification System) is the more modern six-digit standard, with finer granularity and better coverage of newer industries — especially in technology and services.
- SIC — broad, legacy, four digits, ubiquitous in older datasets.
- NAICS — granular, current, six digits, better for modern verticals.
- Many quality databases map both, so you can segment either way.
Why accurate mapping matters
Industry codes are only as useful as they are accurate. A company miscoded into the wrong vertical pollutes every segment it touches. The strongest databases combine code-based classification with AI-assisted validation, so your industry segments reflect what companies actually do — letting you prioritize the highest-value verticals with confidence.
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