What Are NAICS Codes?
NAICS stands for North American Industry Classification System. It's a standardized numbering system used by the United States, Canada, and Mexico to classify business establishments by their primary type of economic activity.
Each NAICS code is a 6-digit number. The first two digits identify the economic sector (e.g., 23 = Construction). Each subsequent digit narrows the classification: subsector, industry group, industry, and national industry.
For example, let's break down NAICS code 561720:
56561561756172561720The 2022 NAICS revision (currently in use for 2026) contains 1,012 national industries. Your business will typically fall under 3 to 8 codes, depending on how diverse your services are.
Key Concept
Why NAICS Codes Matter in Government Contracting
NAICS codes aren't just bureaucratic labels. They directly impact three critical things in your GovCon journey:
Size Standards
Each NAICS code has a small business size standard — either annual revenue or employee count. You might be 'small' under one code but not another. This determines set-aside eligibility.
Opportunity Matching
Federal agencies tag every solicitation with a NAICS code. If your SAM.gov profile doesn't include that code, you won't appear in their search results.
Set-Aside Eligibility
WOSB set-asides are only available for certain NAICS codes. If your primary code isn't on the SBA's WOSB list, you can't compete for those reserved contracts.
Here's a real example of why this matters: A construction company with $30 million in annual revenue might be "small" under NAICS 236220 (Commercial Building Construction, size standard: $45M) but "large" under NAICS 541330 (Engineering Services, size standard: $25.5M for certain subcategories).
That means the same company can compete for small business set-asides in construction but not in engineering. Choosing the right primary NAICS code is a strategic decision, not just an administrative one.
Critical Warning
How to Find Your NAICS Codes
There are two ways to identify your NAICS codes: manual research and automated tools. Here's both:
Option A: Manual Research
Go to the Census Bureau's NAICS search at naics.com/search or census.gov/naics
Search by keyword for your business activities (e.g., 'janitorial', 'IT consulting', 'construction')
Read the full description of each code to ensure it matches your actual work
Check the SBA size standards table to confirm you qualify as 'small' under each code
Look at SAM.gov opportunities tagged with those codes to verify they match the kind of work you want to pursue
Option B: Use the CapturePilot Quick Checker
Instant NAICS Identification
Enter your business name or describe what you do. Our engine cross-references your description against all 1,012 NAICS codes and returns the best matches with size standards, set-aside eligibility, and current federal spending volume for each code.
Run Quick CheckerWhether you go manual or automated, the goal is the same: identify every NAICS code where (a) you can genuinely perform the work, and (b) you qualify as a small business.
Top NAICS Codes for Small Business GovCon
These five NAICS codes consistently offer the most opportunity for small businesses entering the federal market. Each has high volume, strong set-aside percentages, and accessible entry points:
Janitorial Services
5617202.7 billion sq ft of federal real estate needs cleaning. High recurring revenue, low barrier to entry, and a massive small business set-aside percentage. Many contracts are 5+ years with options.
Tip: Focus on SDVOSB/WOSB set-asides for VA and DoD facilities first.
Computer Systems Design Services
541512The largest NAICS by federal spending. Covers IT modernization, cloud migration, systems integration, and custom software development. Every agency is buying this.
Tip: Specialize in a niche (cloud, cybersecurity, data analytics) rather than being a generalist.
Commercial/Institutional Building Construction
236220Military base construction, federal building renovations, VA medical center upgrades. Large dollar values and long performance periods. SDVOSB set-asides are common.
Tip: Build past performance through subcontracting with large primes first.
Engineering Services
541330Environmental engineering, civil engineering, systems engineering. Government agencies rely on contracted engineers for nearly every infrastructure project.
Tip: Pair with construction NAICS codes for design-build opportunities.
Security Guards and Patrol Services
561612Federal buildings, military installations, VA hospitals, and courthouses all require contracted security. Steady, recurring revenue with clear performance metrics.
Tip: Get your employees cleared early — cleared security guards command premium rates.
Market Intelligence
Multiple NAICS Codes Strategy
Most businesses should register with 3 to 8 NAICS codeson SAM.gov. But not all codes are created equal. Here's how to think strategically:
Primary Code = Your Bread and Butter
Choose the one NAICS code that best represents your primary revenue-generating activity. This is what the SBA uses if your size status is challenged. Make it count.
Secondary Codes = Expansion Lanes
Add codes for adjacent services you can legitimately perform. An IT company (541512) might also add cybersecurity consulting (541519) and data processing (518210).
Strategic Codes = Set-Aside Access
Some codes have higher small business set-aside percentages or are on the WOSB eligible list. If you can genuinely perform the work, adding these codes opens new doors.
Remove Irrelevant Codes
Don't list 20 codes 'just in case.' Contracting officers view unfocused profiles with suspicion. Quality over quantity — only list codes where you have real capability.
Review your NAICS codes annually. As your business grows, you may want to add new codes or drop ones where you no longer qualify as small.
Common NAICS Code Mistakes
These mistakes cost small businesses real contract opportunities:
Listing every remotely related NAICS code. Stick to 3-8 codes where you have demonstrable capability. A 20-code profile screams 'we don't know what we do.'
Choosing the wrong primary NAICS code. Your primary code determines your size standard. Pick the one that best represents your main revenue source AND keeps you under the size threshold.
Not checking size standards before selecting codes. You might be small under NAICS 236220 ($45M) but large under 541330 ($25.5M). Check the SBA table for every code you list.
Ignoring the WOSB eligible NAICS list. If you're a women-owned business, check whether your codes are on the SBA's WOSB eligible list. Not all codes qualify.
Using outdated NAICS codes from the 2017 revision. The 2022 NAICS revision changed several codes. Make sure you're using the current version — search census.gov/naics.
Copying a competitor's NAICS codes without analysis. Their business is not your business. Your codes should reflect your actual capabilities, past performance, and strategic direction.
Never updating codes as your business evolves. Review during your annual SAM.gov renewal. Add codes for new services, remove codes where you've exceeded the size standard.
Pro Tip
Find Your NAICS Codes in 30 Seconds
Our Quick Checker analyzes your business and returns verified NAICS codes with size standards, set-aside eligibility, and federal spending data for each code.
- Enter your business name or description
- Get verified NAICS codes with size standards
- See set-aside eligibility per code
- View active federal spending volume
- Compare against registered competitors
No login required for Quick Check. Free forever.