The information viewed in Contacts is not located in a single file, nor a single directory.
[Copied from another thread I responded to recently:
https://discussions.apple.com/thread/5822404?answerId=24658329022#24658329022]
This MIGHT be include all the files you need, but there might also be Preferences files needed from another directory.
Also, I migrated my data from an older OS X version (10.6.8) where the app was called Address Book. On brand new systems, it is called Contacts, and the correct directory might be named Contacts.
NOTE: Be sure to replace Macintosh HD below with the actual hard drive name if not Macintosh HD, and username below with the actual user's name...
Transfer all the files from Macintosh HD/Users/username/Library/Application Support/AddressBook/
That WILL INCLUDE each of these three subdirectories where the necessary files and data are stored:
Macintosh HD/Users/username/Library/Application Support/AddressBook/images
Macintosh HD/Users/username/Library/Application Support/AddressBook/Metadata
Macintosh HD/Users/username/Library/Application Support/AddressBook/Sources