I stumbled upon this interactive, which visualizes the locations of more than 18,000 international Starbucks locations using Google Fusion Tables and custom JavaScript. Here’s the USA view: 

Europe and Asia:

And Washington, DC. Notice the lack of locations in my ‘hood, Brookland, which is represented in the red circle. Bummer. Fortunately, there’s a nice coffee shop nearby called Cafe Sureia. 

Download the data.