If you are looking for the “government contractor” NAICS code, the most important thing to understand is that there is no single code for all contractors. Instead, you must choose the NAICS code that accurately describes the specific product or service you provide to the government.
In the federal marketplace, contractors are classified by their Primary Business Activity. While businesses often have multiple codes, you must designate one as your primary when registering in the System for Award Management (SAM.gov).
Most Common NAICS Codes for Government Contractors
| Industry Type | NAICS Code | Industry Title |
| Professional Services | 541611 | Administrative Management and General Management Consulting Services |
| IT/Computer Systems | 541512 | Computer Systems Design Services |
| Construction | 236220 | Commercial and Institutional Building Construction |
| Engineering | 541330 | Engineering Services |
| Janitorial/Facilities | 561720 | Janitorial Services |
| Security Services | 561612 | Security Guards and Patrol Services |
What Do These Contractor Codes Cover?
Government agencies post solicitations based on these codes to find qualified vendors. Depending on your business, you might fall under:
- 541611 (Management Consulting): This is one of the most common codes. It covers businesses providing strategic planning, site selection, and general business process improvement.
- 541512 (IT Systems Integration): Used for contractors who design and manage computer networks, integrate hardware and software, and provide office automation.
- 236220 (Commercial Construction): The primary code for contractors building or renovating federal buildings, barracks, and schools.
- 541330 (Engineering): Covers civil, mechanical, and electrical engineering firms providing technical designs and feasibility studies.
The important distinction here is what you do, not who you sell to. Even if 100% of your revenue comes from the government, your NAICS code is based on your industry (e.g., HVAC repair or software development).
How Do I Choose the Correct Code for Contracting?
To qualify for set-aside contracts (such as Small Business, 8(a), or Veteran-Owned), you must select the code that generates the most revenue for your firm.
Steps to find your code:
- Identify the core service your business provides.
- Consult the 2022 NAICS list to find the 6-digit code that matches.
- Check the SBA Size Standards for that specific code. Each code has a different “size limit” (either by employee count or annual revenue) that determines if you qualify as a “Small Business.”
You may need multiple codes if:
- You provide a variety of services (e.g., you do both IT consulting and staff augmentation).
- A specific government contract is posted under a secondary code that still fits your capabilities.
Where Will You Need These Codes?
SAM.gov Registration. You cannot bid on federal contracts without an active SAM.gov profile. You must list your primary NAICS code and all secondary codes here to be visible to contracting officers.
SBA Small Business Certification. To qualify for “Small Business Set-Asides,” the SBA will look at your primary NAICS code to verify that you fall below the maximum revenue or employee threshold for that industry.
DSBS (Dynamic Small Business Search). This is the “search engine” used by government buyers to find local contractors. Your listed NAICS codes act as keywords that help them find you.
Past Performance and Rating. Your CPARS (Contractor Performance Assessment Reporting System) ratings are tied to the NAICS code under which the contract was performed.
541611 in the NAICS Hierarchy (Common Contractor Example)
Every NAICS code sits inside a structured hierarchy. Here is an example of the hierarchy for Management Consulting, a top code for service contractors:
| Level | Code | Title |
| Sector | 54 | Professional, Scientific, and Technical Services |
| Subsector | 541 | Professional, Scientific, and Technical Services |
| Industry Group | 5416 | Management, Scientific, and Technical Consulting Services |
| NAICS Industry | 54161 | Management Consulting Services |
| National Industry | 541611 | Administrative Management and General Management Consulting Services |
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