From 1.30.7 you can also attach a City to State. See below video
Edit Area / City from admin
Edit Area
Attach city and save
Save New Area / City In Front End Submission
If you let the city / area be input fields (synced with google places), the City and Area are saved in the database automatically as linked together.
Set this to yes
These values added will automatically be saved as connected
The city > area connection is used in:
Search:
Properties List / Taxonomy – standard template