When Is It Worth Creating More Than One Delivery Zone?
You should create more delivery zones primarily in the following cases:
Different meal plan pricing for different delivery zones
Different cut-off times for each delivery zone
Separate delivery reports for each zone
Different drivers or different courier companies in different zones (for list-based configuration)
Different delivery times in different zones (for list-based configuration)
So if you want to differentiate the above aspects for particular cities/regions then you should create separate delivery zones for them.