You can merge locations into one listing in two (2) ways:
If the addresses match:
Contact Google Support to merge both locations.
If the addresses do NOT match:
One solution is to mark the second location as a Duplicate or Permanently Closed.
Follow the steps below:
2. Click the Suggest an Edit option.
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Note: You can only suggest an edit to a location if you have an account and are logged in to Google.
3. Click Close or Remove.
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or Duplicate of another place.
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Permanently Closed
You can also add helpful resources to support your claim.
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Duplicate of another place
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Google will then reach out to you via email whether your edits have been approved or not.