NAICS Code Lookup

Business classification follows the work performed at an establishment, not the words in a company name. A bakery with a retail counter, a software consultancy that also resells equipment, and a construction company with several trades may each need a code based on the activity that best represents the location being reported.

The North American Industry Classification System (NAICS) gives that activity a place in a hierarchy. U.S. statistical agencies use it to collect and publish economic data, while registrations, procurement systems, lenders, insurers, and analysts may also ask for a code. The receiving organization can impose its own instructions, so a plausible search result is a starting point rather than an official assignment.

Revision year matters as much as digit count. Codes can be created, combined, split, or retired when NAICS is revised. A 2017 code found in an old account may therefore be useful for reconciliation but wrong for a new 2022 filing. Record the revision with the code whenever datasets or forms may be compared later.

Words alone can also mislead. Official definitions include activities that a short title does not reveal and exclude others that sound similar. Check the full definition, examples, and exclusions for the leading candidate, then compare nearby codes when the establishment earns meaningful revenue from more than one activity.

How to Use This Tool:

Start with the establishment's main activity and choose a search mode that matches the evidence you already have.

1. Enter a two- to six-digit code, an official title, or a short activity phrase in Code or activity.
2. Choose Smart activity search for ordinary descriptions. Use Exact code or title to validate a known value, Code starts with to browse a branch, or Title contains all words for literal title matching.
3. Open Advanced only when you need to change the 2022 revision scope, hierarchy depth, sector, candidate count, or minimum score. Keep All sectors when the broad sector is uncertain.
4. Compare the leading candidates and read the hierarchy path. If nothing survives the filters, shorten the activity phrase, restore all sectors, include more hierarchy levels, or lower the score threshold.
5. Verify the final candidate against the official 2022 definition and the receiving agency's instructions before filing or joining datasets.

Interpreting Results:

The first row is the strongest match under the selected local rule, not a Census determination or probability. Close scores mean several titles or keyword hints fit the phrase. Compare those candidates instead of treating rank one as settled.

• Confirm that every broader hierarchy level describes the establishment.
• Treat Retired 2017-only rows as historical evidence, not current 2022 choices.
• Use the change indicator as a prompt to inspect the revision notes; it does not explain the full change by itself.
• Recheck the primary activity when the establishment spans products, services, or locations that could be classified separately.

Technical Details:

The lookup searches an in-browser copy of the 2022 U.S. structure and a bounded set of codes present only in the 2017 reconciliation data. The searchable rows contain codes, official titles, hierarchy levels, change indicators, and selected keyword hints. They do not contain the complete Census definitions, inclusions, exclusions, or agency-specific filing rules.

Lookup Core

Revision scope, hierarchy level, and sector are applied before ranking. Results with no positive match or a score below Minimum score are removed, then the leading 5 to 30 rows are kept. Equal scores prefer current rows, then six-digit national industries, then numeric code order.

Rule Core

Smart search normalizes punctuation and case, removes common words such as “the” and “services,” and adds every applicable signal. An exact code contributes 300 points; a code prefix starts at 220 and loses one point for each extra digit. An exact title contributes 260, while a contained phrase contributes 180. All query words in the title add 140; if they appear only across title, keyword hints, and sector evidence, they add 100 instead.

Each remaining query word adds 24 points when found in the title, 16 in keyword hints, and 6 in the sector title. A six-digit national industry gains 5 points and a retired row loses 15. Scores are rounded to whole points, although every declared contribution is already integral. The 0-to-100 minimum-score control is only a local filter; scores can exceed 100 and have no official confidence meaning.

Hierarchy and revision boundaries

Sector ranges are normalized so codes beginning 31, 32, or 33 map to sector 31-33; 44 and 45 map to 44-45; and 48 and 49 map to 48-49. A hierarchy path is formed from the leading code's two-, three-, four-, five-, and six-digit prefixes where those rows exist. Missing rows are shown as gaps rather than silently invented.

Accuracy and Privacy Notes:

Activity text and ranking stay in the browser against local reference data. That protects the query from a lookup service, but it does not make the result authoritative or keep the 2022 edition current after a later NAICS revision.

• Do not enter confidential client or operational detail when a short activity phrase will distinguish the establishment.
• Use current Census definitions and the form owner's instructions for the final assignment.
• Do not compare codes across revision years without a concordance or documented reconciliation.

Worked Examples:

References:

• North American Industry Classification System, U.S. Census Bureau.
• 2022 NAICS United States Manual, U.S. Census Bureau, 2022.