Also called Name address phone consistency, Citation consistency.
NAP consistency means a business's name, address, and phone number appear identically everywhere they are published, from the website to the Google Business Profile to third-party directories.
Search engines and AI assistants treat contradictions as a reason to doubt a business is real, and an unverifiable business does not get ranked or recommended.
The mismatches are almost never deliberate. A suite number added on one listing and not another, a tracking number in a directory, an old address left behind after a move, a legal name in one place and a trading name in another. Each is trivial and the aggregate is a business that looks slightly different everywhere it appears.
This matters more now than it did five years ago. A search engine could rank you despite some noise; an assistant deciding whether to put one name in front of a homeowner is doing a verification job, and inconsistency is exactly the signal that makes a source risky to cite.
Fix the Google Business Profile and the website first, since those carry the most weight, then work outward through the directories that actually appear when you search your own business name. Chasing hundreds of low-quality citations is a job vendors sell and rarely worth buying.
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