Blue Book

The Blue Book record

America's industrial directory, now read by AI too

Every US industrial company in the record is listed under one or more of these 3,224 categories. Choose one below to see how AI assistants answer buyers looking for a supplier in it, state by state.

Find your categoryNew here? See how we measure AI visibility

The record, by the numbers

536,645

Companies listed

3,224

Industry categories

37

Index cells published

Latest finding

Aluminum Fabrication & Machining Services in Ohio

30 of 173 companies named
Measured September 24, 2026Read the finding

How to use the directory

  1. Step 1

    Find your industry

    Search or browse the categories below. Every company in the record is listed under at least one.

  2. Step 2

    Choose a state

    One category in one state is one cell of the AI Visibility Index.

  3. Step 3

    See who AI names

    Each published cell shows which companies AI assistants name when a buyer asks for a supplier.

Browse all categories

Categories are listed A to Z. Choose one to pick a state and open its AI Visibility report.

3,224 categories
marks a category with a published Index report for at least one state.The number beside each category is how many companies it lists.

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