What Are NAICS Codes?
NAICS (North American Industry Classification System) codes are six-digit numbers that classify every business in the United States, Canada, and Mexico by industry. The federal government uses NAICS codes to categorize procurement opportunities, determine small business size standards, and organize spending data. Every federal solicitation on SAM.gov is tagged with at least one NAICS code.
For example, 541512 is "Computer Systems Design Services," 236220 is "Commercial and Institutional Building Construction," and 722310 is "Food Service Contractors." There are over 1,000 unique codes covering every industry from agriculture to space exploration.
When you register your business on SAM.gov, you select the NAICS codes that describe your work. These codes determine which contract opportunities you see, which set-aside programs you qualify for, and what "small business" means for your industry (size standards vary by NAICS code).
Why NAICS Codes Matter for Federal Contracting
Your NAICS codes affect federal contracting in three critical ways. First, they determine your search results. When you search SAM.gov or any contract database by NAICS code, you only see opportunities tagged with those codes. Wrong codes mean missed opportunities.
Second, NAICS codes define your size standard. The SBA assigns a size standard to each NAICS code — either a maximum number of employees or maximum average annual revenue — that determines whether your business qualifies as "small" for that industry. A company that's small under one NAICS code might be large under another.
Third, set-aside eligibility depends on your NAICS code and corresponding size standard. An 8(a) set-aside for NAICS 541512 (Computer Systems Design) has a size standard of $34 million in average annual revenue. The same certification under NAICS 236220 (Building Construction) has a size standard of $45 million. Choosing the right code matters.
The Traditional Way to Find Your Codes
The traditional approach to identifying your NAICS codes involves browsing the Census Bureau's NAICS manual, searching by keyword, and reading detailed descriptions to find the best match. The manual has a hierarchical structure: two-digit sector codes (like 54 for Professional Services) break down into three-digit subsectors, four-digit industry groups, five-digit industries, and six-digit national industries.
This process works but it's tedious, especially for businesses that span multiple industries or use different terminology than what appears in the classification manual. A company that describes itself as "we build mobile apps" needs to figure out that the government calls that 541511 (Custom Computer Programming Services) or 541512 (Computer Systems Design Services) — and that the distinction matters for size standard purposes.
Many businesses end up either choosing codes that are too broad (missing niche opportunities), too narrow (excluding relevant work), or simply wrong (misrepresenting their industry to the government).
Finding Your NAICS Codes in Seconds with AI
AI-powered tools eliminate the guesswork. Instead of browsing a classification manual, you describe your business in your own words and the AI identifies the matching NAICS codes. It understands that "we make mobile apps" maps to 541511, "we clean offices" maps to 561720, and "we do cybersecurity audits" maps to 541512 and 541519.
FedOverwatch's AI advisor Fede performs NAICS identification automatically as part of its contract matching process. Describe your business and Fede returns your top NAICS codes with plain-English explanations, relevant size standards, and matching federal opportunities — all in a single conversation. No manual browsing, no classification expertise required.
The AI also catches secondary codes that humans often miss. A marketing agency might focus on 541810 (Advertising Agencies) but overlook 541613 (Marketing Consulting), 541430 (Graphic Design), and 541922 (Commercial Photography) — each of which opens up additional federal opportunities.
Getting Your Codes Right Matters
Incorrect or incomplete NAICS codes have real consequences. If you're registered under 541511 but a perfect opportunity is posted under 541512, you won't see it in a NAICS-filtered search. If you're claiming small business status under a code where your revenue exceeds the size standard, you could face a size protest that disqualifies you from an award.
Review your NAICS codes annually. As your business evolves, your codes should evolve too. Adding a new service line? Make sure the corresponding NAICS code is on your SAM.gov profile. Growing beyond the size standard for one code? You may still qualify as small under a different code for the same work.
When in doubt, let AI help. Describe your current capabilities and let a tool like Fede confirm that your registered codes match what you actually do. It takes 30 seconds and could save you from missing thousands of dollars in opportunities.
Start with the Right Codes
NAICS codes are the foundation of federal contract search. Getting them right opens the door to opportunities you'd otherwise never see. Getting them wrong closes doors you didn't know existed.
Skip the manual classification exercise. Visit fedoverwatch.com/lp/fede, describe your business to Fede, and get your NAICS codes identified in seconds. It's free, it's instant, and it might change how you think about what the government buys.