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Maryland tells you the exact format your license number has to appear in

Most states that require a license number in advertising leave the presentation to you. Maryland does not. The Maryland Home Improvement Commission requires each home improvement advertisement to contain the contractor name and license number, displayed with the "MHIC #" prefix, on contracts, on advertisements, and on both sides of vehicles used for business.

A prescribed format is genuinely useful for local SEO, because it turns an ordinary compliance item into a consistency test you can actually check. Either every listing carries "MHIC #" followed by your number, exactly, or it does not. There is no judgement call and no partial credit, which makes it one of the few audit items on a directory profile with an objectively correct answer.

Maryland is also a small state containing two very different markets. The Washington and Baltimore suburbs carry metro-level competition, while the Eastern Shore and Western Maryland are far less contested. A business serving both is running two campaigns whether it accounts for that or not.

Use the prescribed format as your consistency baseline

Work through every place your business appears and check that the license number is present and formatted as the Commission requires. Google Business Profile description, website footer, service pages, Yelp, Angi, the trade directories, and the vehicle graphics if you are auditing offline too. The prefix is part of the requirement, not decoration.

The reason this doubles as SEO work is that whoever is filling in the license field is also filling in the name, address and phone field, and inconsistencies travel together. In practice a business whose license number is missing on four directories usually has a name or suite-number variation on the same four. Fixing them in one pass is cheaper than fixing them twice.

The Commission also publishes a license search, which makes the number verifiable rather than decorative. A customer comparing two contractors can check yours in seconds, and Google has another public record connecting your listing to a registered entity.

Sources: Maryland Home Improvement Commission — advertising requirements; Maryland Home Improvement Commission. Regulatory detail is provided for orientation and is not legal advice.