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Ask Jack: NAICS & SIC Code Finder

Deterministic NAICS & SIC code finder · 100% static · not AI · zero hallucination. Describe your business or enter a code number for instant, cited results.

Ask Jack Automated Tool
Deterministic · Instant

Hi! I'm Jack. Describe your business in plain English (e.g. "I run a roofing LLC" or "law firm") or type a code (e.g. "541511"). I'll return your official NAICS 2022 & SIC 1987 codes with zero hallucination.

Jack (Automated Bot)
1. Describe

Type your trade or service in plain English or enter any 4-digit SIC or 6-digit NAICS code.

2. Deterministic Match

Local indexed token matching maps your query to official Census 2022 & OSHA 1987 manuals.

3. Open & Verify

Click result cards to view full size standards, IRS tax codes, definitions, and crosswalk paths.

How the Smart NAICS & SIC Finder Works

Selecting the correct industry code is critical for federal contracting (SAM.gov), IRS Schedule C tax filing, SBA small business set-aside qualification, and business credit reporting. However, official government manuals contain thousands of technical classifications that can be difficult to navigate.

Our Smart Finder translates natural language phrasings like "I run a roofing business" directly into the official 6-digit NAICS 2022 code (238160) and legacy 4-digit SIC equivalent (1761). It runs entirely inside your web browser using static indexes — ensuring instant answers with guaranteed zero data hallucination.

Looking to verify a company's legal registration or active state standing? Consult our official 50-State Secretary of State Business Verification Directory.

Frequently Asked Questions

Is this finder AI-powered or does it send data to an external server?
No. The Smart Finder is a 100% client-side, deterministic matching engine. It processes your input locally in your browser using indexed government concordance tables. It makes zero API calls to external LLMs or third-party servers, guaranteeing complete privacy and absolute accuracy.
How do I select the right primary NAICS code for SAM.gov registration?
Under Federal Acquisition Regulation (FAR) rules, your primary NAICS code must represent the business activity that accounts for the largest portion of your annual revenue. You can also register multiple secondary NAICS codes on your SAM.gov profile to highlight ancillary services.
What is the difference between NAICS codes and legacy SIC codes?
SIC (Standard Industrial Classification) is a legacy 4-digit system established in 1937, while NAICS (North American Industry Classification System) is the modern 6-digit federal standard introduced in 1997. Federal agencies and SAM.gov require NAICS codes, whereas banks and credit registries like Dun & Bradstreet still reference SIC codes.
What happens if the finder cannot locate a match for my query?
Our engine adheres to strict zero-hallucination rules. If an exact industry match is not found, the tool honestly notifies you and suggests trying broader industry keywords (e.g., 'restaurant' or 'consulting') or exploring our complete Sector Directory.