What is a Google CID? The unique ID behind every Maps business listing

What a Google CID actually is

A Google CID, short for customer ID, is a unique numeric identifier that Google assigns to a single business entity on Google Maps. Every restaurant, dentist, plumber, and hotel that appears on the map has its own CID. Think of it as the primary key for that listing inside Google's local index.

The value is a large integer, often 18 to 20 digits long, for example 17905869374101083665. Unlike a business name or a phone number, the CID does not change when the owner edits the listing, moves the pin slightly, or updates the hours. That stability is exactly what makes it useful for anyone building a structured database of local businesses.

You will most often see the CID surface inside a Google Maps share URL. When you open a business and copy its link, Google returns a canonical address that references the place. That link, and the identifiers behind it, are documented in the official Google Maps URLs guide.

Where you find a CID and how it looks

The CID travels inside Google Maps links in a couple of recognizable shapes. When you share a place, the URL frequently contains a hexadecimal fragment. The last block after the colon is the CID, written in hex. Convert that hex value to decimal and you get the plain numeric customer ID.

For example, a share link may end in a segment such as 0x0:0xf87a4d3e6c1b91. The part after the colon is the hex form of the CID. Tools and scrapers read that fragment, convert it, and store the decimal value alongside the business record so it can be matched later. The point is that the CID is always retrievable from Maps, no private API required.

Because the CID is machine friendly and never depends on spelling, it is the cleanest way to answer the question "have I already seen this business?" when you merge two lists. A name like "Joe's Plumbing" can appear five different ways. The CID appears exactly one way.

CID vs Place ID vs other Google Maps identifiers

Google uses several identifiers for the same place, each born in a different system. The table below lines them up so you can tell them apart at a glance.

The most common point of confusion is CID versus Place ID. Both identify the same business, but they come from different products. The Place ID is the string the Google Places API expects, and it is described in detail in the official Place ID documentation. For a deeper walkthrough of that identifier, see our guide on what a Google Place ID is. If you want the full column list a Maps record can hold, read Google Maps data fields explained.

Why the CID matters for a lead database

If you scrape one city today and the same city again next month, you will pull many of the same businesses twice. Matching on name and address is fragile: punctuation, abbreviations, and suite numbers all drift. Matching on the CID is exact. One CID, one business, one row.

That reliability is the foundation of a value added database rather than a throwaway CSV. When each record carries a stable identifier, you can enrich it over time: add the website, attach reviews, log the last time you contacted the owner, and track status on a map. A raw export cannot do that because it has no anchor. To see the difference in practice, compare fresh Google Maps data against bought lists.

This is where the extension is only the means and the dashboard is the end. Capturing the CID is step one. The value comes from what Vonsel does after: it deduplicates on that key, lets you reopen a previous scrape and add more businesses to it, attaches AI analyzed reviews per business, and drafts a contextual email for each lead based on its real pain points.

Getting the CID without touching code

You can pull a CID by hand. Open the business on Google Maps, copy its share link, and read the identifier from the URL fragment. That works for one listing. It does not scale to a whole city.

The practical route is a browser extension. The free Vonsel Google Maps scraper extension runs inside Chrome, reads each business as you browse a search, and records the identifiers, phone, website, and reviews automatically. It installs like any browser add-on, and Google documents how extensions run in the Chrome extensions developer guide.

Everything lands in your Vonsel dashboard, deduplicated on the CID, ready to filter, enrich, and route. You never open a spreadsheet unless you want to. Explore what the platform does with that data on the features page, or browse more explainers in the database category.