NAP consistency: definition and pitfalls

Definition : The fact that a business's name, address and phone number are strictly identical across every online source that mentions it.

NAP stands for Name, Address, Phone. NAP consistency means that this trio is rigorously identical everywhere your business appears: your website, your Google Business Profile, Maps, directories, review platforms, social accounts, marketplaces.

The principle is simple. Search engines and AI models have no way of knowing a priori which piece of information is correct: they cross-check. When five sources give the same address, confidence is high. When two contradict each other, doubt sets in — and a system in doubt prefers to cite a business it doesn't doubt. This is a trust signal in the E-E-A-T sense, and it weighs all the more in generative answers, where the shortlist is often just two or three names.

Inconsistencies are rarely deliberate. They accumulate: a move never propagated, an old number lingering, a directory filled in six years ago, a previous website never taken down, a registered company name on one side and a trading name on the other. The most frequent cases:

Name: "Dupont Ltd" on the site, "Chez Dupont" on the profile, "Dupont Paris 11" in a directory. Pick one form — the one on your shopfront — and hold to it.
Address: inconsistent abbreviations ("St" / "Street"), an address line present here and missing there, an old address still live.
Phone: a mobile in one place and a landline in another; or a call-tracking number that differs from the real one.

The good news: fixing NAP requires no technical skill, only an hour of methodical inventory. Search your business name and your old phone number on Google, list every listing that surfaces, and align them one by one on a single reference. Then declare that reference cleanly on your site through LocalBusiness markup, geo-coordinates included. It is the best effort-to-result job in local SEO, and among the most neglected.

Common mistakes

Fixing the Google profile and stopping there: forgotten directories keep broadcasting the old information and sustain the contradiction.
Using a call-tracking number: handy for measuring calls, damaging for consistency if that number does not appear identically everywhere.
Leaving an old website live: a previous site still online with outdated details competes with you and blurs your identity.
Skipping geo-coordinates: in LocalBusiness markup they remove all ambiguity about location — decisive when several businesses share a similar name in one town.

Common mistakes

And for your business, concretely.