Hi there!
Thanks for stopping by to chat with us! 🙂 Good question–Filter Bar does support “City” as a possible filtering option, as well as other location-based filters such as state, country, and venue. You can read more about configuring Filter Bar with the filters of your choice on our Knowledgebase here.
If you’d like to hide certain cities from the city-based filter, this is something you’d likely need to achieve by way of customizations–our Themer’s Guide would be the place to go for more info on how to customize plugin templates for your purposes.
I hope that helps! Let me know if you should have any other questions!