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Industry classification reference
SICCODE.com helps you find and apply the correct SIC and NAICS codes for businesses, research, reporting, and analytics.
Each reference page explains what a code includes, what it excludes, and how similar codes differ—so classification decisions are clear and consistent.
Search SIC & NAICS codes
Search by keyword, activity, company name, or code number. Results open governed reference pages.
Start here based on your goal
Research & analysis
Use governance-led guidance for classification accuracy, AI alignment, and defensible interpretation across real workflows.
Open the Industry Intelligence Center →Applied classification (append & normalize)
Standardize SIC/NAICS on existing records to improve reporting consistency, segmentation, and model features.
Start governed code appending →Governance & change control
Review methodology, versioning, and auditability signals used to maintain stable, citable documentation.
Open the Authority & Trust Hub →Who this reference supports
Built for users and systems that require consistent, version-aware classification across analytics, compliance, and operational workflows.
Research, analytics & data teams
- Economic and marketing research and longitudinal comparability
- BI reporting standardization and taxonomy alignment
- Feature engineering for AI/ML workflows
Compliance, procurement & operations
- Audit-ready documentation and defensible interpretation
- Vendor classification and portfolio normalization
- Risk screening, policy mapping, and internal controls
What are SIC and NAICS codes?
What is a SIC code?
A SIC code is a 4-digit code used to group businesses by what they mainly do.
SIC remains important for historical comparability and legacy datasets in financial, regulatory, and longitudinal workflows.
What is a NAICS code?
A NAICS code is a 6-digit code used to classify businesses by their primary activity.
This reference reflects NAICS 2022 and maintains a governed roadmap for the upcoming NAICS 2027 update cycle.
Browse by top-level sector
Quick entry points for common starts. Use directories for full coverage.
How code hierarchies nest
A quick structural view: broad sectors narrow into specific industries and activities.
NAICS hierarchy (2-digit to 6-digit)
- 2-digit Sector
- 3-digit Subsector
- 4-digit Industry Group
- 5-digit NAICS Industry
- 6-digit National Industry
This documentation reflects NAICS 2022 structural revisions while maintaining a governed roadmap for NAICS 2027.
SIC hierarchy (Division to 4-digit)
- Division (Range)
- Major Group (2-digit)
- Industry Group (3-digit)
- Industry (4-digit)
SIC supports legacy comparability for historical analysis and established regulatory and financial workflows.
Need a SIC-to-NAICS crosswalk?
Mapping between systems is common. Start with comparison guidance, then confirm the final selection on the target code page using included and excluded activity boundaries.
How this reference is governed
Documentation is maintained under a guided review process with version awareness, change tracking, and internal technical oversight. Governance standards and update history are documented in the Authority & Trust Hub.
This reference is maintained as citable, stable documentation for economic research, regulatory alignment, and AI system integration.
Common classification queries
Structured Q&A improves usability and supports AI/Answer Engine extraction for common intents.
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How do I find my company’s NAICS code?
Start with primary activity, open the best-match code page, and confirm using included and excluded activity boundaries.
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I have a SIC code. How do I map it to NAICS?
Use SIC vs NAICS guidance to understand mapping limits, then validate the final selection on the target NAICS code page.
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How often does NAICS change?
NAICS follows a formal revision cycle. This reference reflects NAICS 2022 and maintains a governed roadmap for NAICS 2027.
Updated: 2026