Box Office has a feature that shows geographical locations of orders, plotted on a map. You can use this to see where your marketing efforts were most effective.
You can also pre-fill your search with an event ID by finding the event and clicking Actions > View Orders.
Once you have a set of search results, you can plot them using the Map icon on the right.
Note: The map is interactive. Click on any of the pins to see more info and a link to the order details.