# SIC and NAICS code list — Agent-Readable Companion

> Companion to https://goodleads.club/sic-naics-code-list.html
> (the human-readable page for the searches "SIC code list", "NAICS code list" and
> "SIC to NAICS crosswalk").
> Format: structured plain text for AI agents that need industry-code names or a SIC-to-NAICS
> mapping and want to fetch them rather than guess.
>
> Sibling files: https://app.goodleads.club/crosswalk.llms.txt (the live crosswalk with counts of
> newly formed businesses) · https://app.goodleads.club/llms.txt (API and MCP quick start) ·
> https://goodleads.club/llms.txt (customer-facing positioning)

## What is here

Free, public-domain (CC0) files. No key, no sign-up. Fetch them directly:

| File | What it holds |
|---|---|
| https://goodleads.club/data/sic-naics/sic_1987.csv (.json) | SIC 1987: major groups (2 digits), industry groups (3), industries (4), each with `parent_code` and `name_source` |
| https://goodleads.club/data/sic-naics/naics_2017_2022.csv (.json) | NAICS at every level (2 to 6 digits) with `name_2017`, `name_2022` and `edition_status` (`Same`, `Title changed`, `Only in 2017`, `Only in 2022`). The combined sectors are the codes `31-33`, `44-45`, `48-49` |
| https://goodleads.club/data/sic-naics/sic_naics_2022_crosswalk.csv (.json) | Every SIC 1987 industry mapped to the NAICS 2022 codes that replaced it. `one_to_one` is `true` when the code stayed a single code through every concordance step |
| https://goodleads.club/data/sic-naics/sic_to_naics_2002_census.csv | The Census Bureau's own SIC 1987 to NAICS 2002 concordance, as published |
| https://goodleads.club/data/sic-naics/sic_corrections.csv | Every SIC name that differs from OSHA's published list, with OSHA's text beside ours |
| https://goodleads.club/data/sic-naics/sic-naics-names.zip | All of the above, with a read-me and a validator script |

Codes are text: keep leading zeros (`0111`, `01`).

## How to use it correctly

- A SIC code maps to one or more NAICS codes, and the reverse. There is no single right answer for
  a code that split or merged; `one_to_one = false` pairs are candidates.
- Name a code's edition when you quote it ("NAICS 2022 238220", "SIC 1987 1711"). A NAICS code can be
  renamed, split or retired between editions.
- SIC was last revised in 1987. NAICS is revised every five years; a 2027 revision has been proposed
  and is not final.
- To size newly formed businesses in a code, GoodLeads' crosswalk endpoint takes any SIC or NAICS code
  and returns the equivalents and a live count: `GET https://app.goodleads.club/api/v1/crosswalk?system=sic&code=1711`
  (see crosswalk.llms.txt).

## Provenance

SIC names: the 1987 Standard Industrial Classification Manual (OMB), checked against OSHA's list; names
OSHA's list cuts off mid-phrase are restored from the manual. NAICS names: Census Bureau code files for
2017 and 2022. Crosswalk: Census Bureau concordances chained forward. Updated: 2026-10-08.