When autocomplete results are available use up and down arrows to review and enter to select. Touch device users, explore by touch or with swipe gestures.
The Home Depot’s location finder is a typical example. Location Finder, Mchenry, Ecommerce Site, Search Engine Optimization, Internet Marketing, Depot, Example, Business, Online Marketing
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SEO: Store Locators Good for Bots, Good for Shoppers

If you have more than one physical location, in addition to your ecommerce site, you need a store locator. Slapping all your store addresses on a single web page and calling it done doesn’t cut it for shoppers or for natural search performance. An optimal store locator should be searchable for your customers and also crawlable for the search engines.