How can I add a predictive drop down of US cities in product listings?

[jlintvet]

Currently use Globo product options for our listings. I need/want to add a dropdown of all US cities for the customer to select from. But I want it to be predictive ... think that is the term. Like the 'location' drop down on this page https://welltolddesign.com/products/home-town-maps-rocks-glass where it asks you to start typing in your city. I reached out to Globo and that is not supported by their platform. Any ideas how to do this or an app that we can use? Thank you. 

[jlintvet]

Anyone have any ideas. I have one sku that can be personalized by city. Looking for a predictive drop down list. Any ideas?