Karlie here from the Shopify Support Team! What you can do is look into an app that would offer a store locator feature for your storefront. There are quite a few apps in the Shopify App Store that would provide your store with a store locator feature, like so, but I would recommend specifically looking into the apps;
If neither of those apps work for you, then you could look into hiring a developer to create a feature like that. I would suggest looking into our Shopify Experts, here. Shopify Experts are developers, designers, marketers and photographers who you can hire to help you with different aspects of your storefront with Shopify.
I hope this has answered your question. If not, or if you have any further questions please let me know. I will be happy to help!