Duplicate Local Listings can seriously impact your rankings on Google Local search. It is important for businesses to ensure that there is only 1 Listing per each address and each Local Listing page uses its own unique Phone Number which must never be shared with other listing. It is best practice to keep your NAP unique as far as Local Listing is concerned.
Duplicate Listings can also become evident when you were unable to delete your previous local listing and created a new listing without even realizing that your old listing is still active on Google. This article will help you resolve all your duplicate listing issues.