Google CID
A numeric customer ID Google uses internally for a business listing in Google Maps, visible in some Maps URLs.
The CID is a long number that identifies a place in Google Maps and can be used to build a Maps link to it. It is different from the Place ID, which is the identifier Google documents for developers and review links.
SEO tools use the CID to reference a listing unambiguously. For owners it mainly matters when diagnosing duplicates, since two CIDs for one business means two records.
Where this applies
The ranked citation sites for the markets and industries this term shows up in.
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