Maptitude is the best mapping software for business intelligence! The Maptitude Country Packages include point landmark databases that have thousands of retail stores and restaurants, including coffee shops in the United States. The map below shows the concentration of coffee shops by state where you can see that coffee shops are more prevalent in the colder climate states. The greatest concentration can be found in Rhode Island, followed closely by Massachusetts (home of Dunkin Donuts) and Washington (home of Starbucks).
The two largest chains by far are Starbucks and Dunkin Donuts, followed by Tim Horton's, Caribou, and The Coffee Bean & Tea Leaf. The chain with the most stores in each state is also shown on the map. Starbucks is predominant in 35 states, including the entire western half of the country, Dunkin Donuts is predominant in 14 states, mostly in the Northeast and South coast, and Caribou Coffee is predominant in its home state of Minnesota.
There is an updated October 2021 version of this map that also includes Canadian provinces.
Map: Created with Maptitude Mapping Software by Caliper, February 2016