Almost every U.S. business list lets you filter by NAICS code. Used well, the code turns “businesses in Florida” into “roofing contractors in Lee County.” Used carelessly, it produces lists full of companies that do something else. This guide explains what the code is, how to read it and how far to trust it.
What NAICS is
The North American Industry Classification System is, in the words of the U.S. Census Bureau, “the standard used by Federal statistical agencies in classifying business establishments for the purpose of collecting, analyzing, and publishing statistical data related to the U.S. business economy” (Census Bureau, NAICS Codes & Understanding Industry Classification Systems). It was developed jointly in 1997 by Mexico’s statistical institute INEGI, Statistics Canada and the U.S. Office of Management and Budget so that the three countries' industry statistics would be comparable (OMB, 86 FR 72277).
One sentence from that notice is worth remembering whenever you use a code for sales: NAICS “is designed and maintained solely for statistical purposes.” It was not designed as a targeting tool.
How to read a code
NAICS is hierarchical. Each additional digit narrows the activity:
- 2 digits – sector
- 3 digits – subsector
- 4 digits – industry group
- 5 digits – NAICS industry
- 6 digits – national industry
The Census Bureau's own example: 44-45 Retail Trade → 441 Motor Vehicle and Parts Dealers → 4412 Other Motor Vehicle Dealers → 44122 Motorcycle, Boat, and Other Motor Vehicle Dealers → 441222 Boat Dealers. Three sectors span a range of two-digit codes: Manufacturing (31-33), Retail Trade (44-45) and Transportation and Warehousing (48-49).
For a prospect list, choose the level that matches your message. Selling to “construction” (23) is rarely precise enough; selling to “roofing contractors” (238160) usually is.
The code describes an establishment, not a company
NAICS classifies “establishments (individual business locations) by type of economic activity” (86 FR 72277). A company with a factory, a warehouse and a showroom can have three different codes. A business list, by contrast, usually has one row per company and one code per row, a simplification you should be aware of.
A concrete example of the difference between units: for 2022, the Census Bureau counted 523,095 employer firms in Florida but 633,353 establishments (U.S. Census Bureau, Statistics of U.S. Businesses (SUSB) 2022). A firm with five branches is one firm and five establishments. These figures cover businesses with paid employees only. The state registry, by contrast, showed 4,129,182 active business entities as of July 8, 2026 (Division of Corporations, Yearly Statistics). That is several times more, because the registry counts legal entities whether or not they have employees or operations. None of these figures is a count of any list.
NAICS is revised every five years
Revisions “are considered every five years in calendar years ending with 2 and 7” (86 FR 72277). The current edition is NAICS 2022; federal statistics for reference years beginning on or after January 1, 2022 use it. Many company databases and CRM systems still carry 2017 or even older codes, so always ask which edition a list uses.
Two changes in the 2022 edition matter for prospecting:
- Online retail lost its own code. Under NAICS 2017, online sellers were classified in 454110, Electronic Shopping and Mail-Order Houses, part of the subsector Nonstore Retailers. For 2022, the classification committee recommended “eliminating the store/nonstore distinction”: electronic shopping and mail-order houses are “distributed throughout the new structure in the same way as retail stores, delineated by specialized broad product lines, such as groceries, apparel, hardware” (OMB, 86 FR 35350). The reason given: “the internet has developed from a specialized activity to a generic method of delivery for goods and services.” An online clothing store now shares code 458110 with a clothing store on Main Street. You can no longer select “e-commerce companies” by NAICS code.
- Software and hosting were renumbered or renamed. Software Publishers moved from 511210 to 513210, and 518210 was renamed “Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services” (86 FR 35350).
Official statistics lag behind each revision. The Census Bureau's County Business Patterns state that “2017 to 2023 data use 2017 NAICS” (CBP methodology), so the latest county figures still carry the old codes; see Florida business statistics by county.
Where the code in a list comes from
This is the question that determines how much a code is worth. In Florida, the state corporate registry does not record an industry: the contents of articles of incorporation and of the annual report are set by statute (Fla. Stat. § 607.0202, Fla. Stat. § 607.1622), and an industry code is not among them. So a NAICS code in a list of Florida businesses was reported by the business itself on some other form, taken from a license, or assigned by the list's compiler from the company name, a description or the website.
Each route has its typical errors:
- Self-reported codes can be too broad, or may have been chosen once at formation and never updated.
- Codes derived from a name fail for names that say nothing (“Sunshine Holdings LLC”).
- Codes derived from a license are reliable for the licensed activity but exist only for regulated trades.
A good list tells you which route was used and leaves the field empty where no route worked. Ask the seller; if there is no answer, test a sample yourself.
The codes behind our 15 industries
For orientation, this is how the 15 industries of the planned Florida Business Database map to NAICS 2022. The mapping is approximate.
Scroll sideways to see the whole table.
| Industry | NAICS 2022 |
|---|---|
| Professional and Business Services | 54 Professional, Scientific, and Technical Services; 56 Administrative and Support and Waste Management and Remediation Services |
| Construction and Trades | 23 Construction |
| Manufacturing | 31-33 Manufacturing |
| Real Estate and Property Management | 531 Real Estate |
| Utilities and Waste Services | 22 Utilities; 562 Waste Management and Remediation Services |
| Hospitality, Restaurants and Tourism | 72 Accommodation and Food Services; 5615 Travel Arrangement and Reservation Services |
| Agriculture and Food | 11 Agriculture, Forestry, Fishing and Hunting; 311 Food Manufacturing |
| Transportation and Logistics | 48-49 Transportation and Warehousing |
| IT and Software | 5132 Software Publishers; 5415 Computer Systems Design and Related Services; 518 Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services |
| Architecture and Engineering | 5413 Architectural, Engineering, and Related Services |
| Healthcare and Wellness | 62 Health Care and Social Assistance; 8121 Personal Care Services |
| Finance and Insurance | 52 Finance and Insurance |
| Local Government and Public Institutions | 92 Public Administration |
| Automotive and Auto Repair | 441 Motor Vehicle and Parts Dealers; 8111 Automotive Repair and Maintenance |
| E-commerce and Online Retail | 44-45 Retail Trade |
E-commerce and Online Retail has no code of its own in NAICS 2022; it is a subset of Retail Trade that has to be identified by other means.
Practical rules
- Start with the narrowest code that still covers your whole target group, then check the neighboring codes for businesses you would miss.
- Ask for the edition (2017 or 2022) and convert before you merge lists.
- Treat the code as a filter that needs a second check: a keyword in the name, a license type or a look at the website.
- Sample before you scale: review 50 records by hand and count the misclassified ones.
Next step: How to build a Florida B2B prospect list by industry and county. The official code lists are published by the Census Bureau at census.gov/naics; an overview of our industries is on the Florida Business Database page.
