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NAICS
NAICS Codes

Official North American industry classification system for business reporting and analysis.

NAICS Code Lookup / Directory NAICS Classification & Reference Center
SIC
SIC Codes

Established U.S. industry classification system widely used across business, reporting, analytics, and cross-dataset comparability.

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Code Systems
Code Systems

Standard classification systems used to organize industries, products, occupations, and business identifiers across U.S. and global datasets

Industry Codes
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Specialized Business Codes
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Classification Conversion Tools

Convert industry codes between classification systems

U.S Industry Codes SIC → NAICS NAICS → SIC
International Industry Codes ISIC → NAICS NAICS → ISIC
Industry Intelligence Center
Industry Intelligence Center

Industry research, structure, and applied insights built on governed NAICS & SIC classification standards.

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Governance
Governance

Governance at SICCODE.com defines how industry classification data is maintained, reviewed, and validated over time. It documents the standards, verification frameworks, and editorial controls used to ensure consistent and neutral application of NAICS and SIC classifications.

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What Is an SIC 6-Digit Code?
All NAICS SIC Companies
SIC 6-Digit NAICS 8-Digit ISIC (International) NACE (Europe) SOC (Occupations) Extended SOC (O*NET)

SIC 6-Digit Codes for "17-3020"

SIC Marketing Level codes provide more specific industry categories within official 4-digit SIC classifications, supporting more precise industry segmentation, market research, and business targeting. For official SIC classification, use the 4-digit SIC code.

Search this keyword in NAICS 8-Digit codes.

companies

Verified U.S. companies available for purchase in this industry. Counts are based on primary business classifications.

Industry SIC 6-Digit U.S. companies Add

Construction Companies

Parent: General Contractors-Single-Family Houses

 SIC Marketing Level 1521-44 companies 52,276companies

Other classifications

Search "17-3020" in Extended NAICS →

Sources & methodology

NAICS definitions: U.S. Census Bureau, 2022

SIC definitions: OSHA SIC Manual

Classification methodology →

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Classification & Data Governance

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Industry research, structure, governance alignment, and applied industry classification insights, across marketing, compliance, analytics, and enterprise decision-making.

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Sector-level NAICS & SIC classification hubs defining scope, boundaries, examples, and cross-industry distinctions.

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Code lookups, conversions, and research utilities for NAICS, SIC, ISIC, and related classification systems.

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Governed industry classification reference.

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