Yes, using CSV file, admin can import all offline store details with ease using MageDelight's Store Locator Extension for Magento 2. Details of the stores can be modified using CSV as and when required.

Read this guide on How to Configure Store Locator in Magento 2 to setup this extension.

Here are the few more resource to help you get most out of this Magento 2 Store Locator Extension.

• Elevate Ordinary Commerce with Magento 2 Store Locator Extension
• Top 15 Magento 2 Store Locator Extensions (Free and Paid)
• Store Locator Page Guide: Sell Smarter Online & Offline