Industrial directory
An industrial directory is a listing service where buyers search for suppliers by capability, material, process or location. Thomas, IQS Directory and MacRAE'S are long-established US examples, and suppliers usually pay for placement within them.
In practice
A directory listing buys three separate things, and they are worth separating because they no longer all hold equally. It puts you in front of buyers who start their search inside the directory. It lends you the directory's own search authority, so the listing may rank for capability-plus-region terms your own site cannot. And for a company with a weak website, it acts as a findable page when you do not really have one.
That third reason is the least comfortable and, for a lot of suppliers, the real one. It is also the one worth fixing rather than renting, because a directory sending traffic to a site that cannot convert it is paying to hand buyers to whoever is listed next to you.
Directories have picked up a new channel rather than losing relevance. When we pulled Google's AI Overview for industrial directory searches in August 2026, most of the cited sources were directories and trade publications. Reach is real. The catch is that the citation goes to the directory, and your listing is a line item inside somebody else's asset, on terms and at a price they set.
The recurring difficulty is attribution. Most suppliers renew without knowing what the listing produced, because enquiries arrive through the same phone number and inbox as everything else. That is fixable, and it is worth fixing before the renewal rather than after.
A test you can run in 30 days at no cost: give the listing its own phone number and its own landing page, ask every inbound enquiry where they found you for a month, then pull the last twenty jobs you won from customers who did not already know you and trace how each started. If none trace to the directory, the enquiry count is not telling you what you assumed.
Common questions
Are industrial directories still worth paying for?
Sometimes, and the answer is specific rather than general. They still work where a capability is genuinely hard to describe in plain search terms, where buyers in that vertical start there by habit, or where your own site cannot yet rank for anything. They are not worth it when the enquiries arriving are outside your target size and no closed work traces back to them.
What are the main industrial directories in the US?
Thomas, IQS Directory and MacRAE'S are the long-established general ones, alongside trade association member directories and regional economic development listings. Which matter depends heavily on the vertical, so ask a few existing customers where they looked before they found you.
Do AI assistants use industrial directories?
They do. When we pulled Google's AI Overview for industrial directory searches in August 2026, most cited sources were directories or trade publications. That is genuine reach, though the citation credits the directory rather than your company, which is the argument for publishing your capabilities somewhere an assistant can read them directly.