The short answer: a handful of public sources
There is no special database where AI companies store the truth about your business. When ChatGPT or Gemini answers a question about a local place, it is pulling from the same public information any customer could find: your Google Business Profile, your reviews and what they say, the directories that list you, a few trusted roundups and local press, and your own website.
That is the whole list. It is short, and almost every item on it is something you control or can influence. The reason an AI sometimes gets your business wrong is not malice or mystery. One of those sources is wrong, thin, or contradicts the others, and the AI repeated it.
- Your Google Business Profile, the listing that powers the map pin
- Your reviews, both the star count and the words inside them
- Directories and citations that list your name, address and phone
- Trusted best-of lists, local press, and industry roundups
- Your own website, where the AI confirms the details
The Google Business Profile is read the most
For anything local, the Google Business Profile is the single heaviest source. It is the structured, official-looking record of your name, address, phone, hours, category and services, and the assistants treat it as a primary fact sheet. Google AI Overviews are built directly on it. ChatGPT and Gemini lean on it too.
This is why a stale profile causes so much trouble. If you changed your hours and never updated the profile, the AI will quote the old hours with total confidence. Worse, a profile accidentally marked as temporarily closed will get you dropped from recommendations entirely, because no assistant wants to send a customer to a closed door.
Claim the profile if you have not, then make every field exact and current. The name, address and phone should match your website letter for letter. The hours should include holidays. The category should be the one a customer would actually pick.
Reviews tell the AI two different things
Reviews do double duty. The count and the rating tell the AI that you are real and busy, which is how it picks between two similar businesses. The text inside the reviews tells the AI what you are actually good at.
That second part is missed by most owners. AI assistants read the words, not just the stars. If customers keep writing that you are great with anxious dogs, that you open early, or that someone on staff speaks Spanish, the AI can pull those phrases and surface you for exactly those questions. Your reviews are quietly writing your business description for you.
Freshness matters as much as volume. Thirty reviews from the last three months reads as more alive than two hundred from four years ago. A steady trickle beats one old burst.
Directories and citations are the cross-check
Beyond Google, the AI sees your business mentioned across directories: the big general ones for your country and the smaller ones specific to your trade. Each accurate listing is a small vote that your details are correct. When several independent sources agree on your address and phone, the AI trusts that answer.
The flip side is the real risk. A forgotten listing with an old phone number or a former address does not just sit there harmlessly. It is one more source the AI reads, and when sources disagree, the assistant hedges or guesses. You do not need dozens of directories. You need the few that matter to all say the same thing.
Best-of lists and local press carry extra weight
When someone asks for the best in a category rather than a specific business, the AI often reaches for lists that already rank or recommend. A local newspaper roundup, an established city guide, a respected industry directory. Being named in one of those teaches the AI that you belong in the answer to best dentist near me, not just dentist near me.
You cannot manufacture these overnight, and you should be wary of anyone who promises to. But a genuine mention in real local press or a credible industry list is worth more than a long tail of low-quality directory entries, and it is the kind of thing that compounds over time.
Your website is where the AI confirms the facts
Your own site is the assistant's confirmation step. Two things make it easy to read. First, put your name, address, phone, hours and service area in plain text on the page, not locked inside an image or a graphic in the footer. An AI reading a picture of your address is one bad guess away from sending customers to the wrong street.
Second, add LocalBusiness structured data. It is a small block of code that states your core facts in a format machines read without interpreting. It does not change how your site looks to a human, and it removes ambiguity for the AI. If writing that block is the bottleneck, the LocalFox report includes a ready-to-paste version filled in with your own details.
Why each assistant can give a different answer
The sources are mostly shared, but the assistants do not weigh them the same way, which is why you can ask three AIs the same question and get three different lists.
ChatGPT and Perplexity read the live web at the moment you ask. They search, fetch a few pages, and summarize, so they react quickly to a fresh review or an updated page, but they also depend on which sources their search happened to surface that minute. Gemini leans on Google's own understanding of the world, so your Google Business Profile and Google's view of your reviews carry more weight there. Google AI Overviews are built straight on Google's local data, which makes them the most sensitive of all to your profile being correct.
The practical takeaway is reassuring. Because the underlying sources overlap heavily, fixing the basics improves your standing across all of them at once. You are not gaming four separate algorithms. You are correcting one shared set of facts.
Confirm it by the rate, not a single answer
The whole point of the source list above is that AI recommendations are not an opaque verdict. Every answer traces back to something you can find and, in most cases, edit. So once you have cleaned up the sources, check whether it landed instead of assuming. Ask the assistants the questions a real customer would ask, in plain language, and see whether you come up. Do not read too much into one reply. AI answers shift from run to run, so a single check can flatter you or scare you for no real reason.
What actually tells you something is the rate. Ask the same question several times across ChatGPT, Gemini and Perplexity and count how often you are named out of all the runs. Being mentioned in eight of ten runs is a real position. Once in ten is noise. Watch that rate move as you fix sources, and you will know which changes worked.
Doing this by hand is tedious, which is why most owners skip the step that proves whether their effort paid off. A LocalFox report runs each question three times per assistant and reports the mention rate, the wrong facts quoted word for word, and which competitors got named instead. If the AIs are skipping you or getting you wrong, the guide "Why isn't my business showing up in AI search?" covers the usual causes, "How to get your local business recommended by ChatGPT" turns the source list into a fix-it order, and "What is GEO (Generative Engine Optimization)?" explains why this is becoming its own channel.