As of February 9, 2017, all of Dunkin' Donuts locations are franchisee owned and operated. Within its Northeast home base, Dunkin' Donuts is very popular, and particularly dominant within the six New England states, especially Massachusetts. In addition to its stand-alone shops, Dunkin' Donuts shops can be found within many gas stations, supermarkets, mall and airport food courts, and Walmart stores. Dunkin' Donuts is continuing to grow by adding more locations around the U.S., including the regions where it has been long established. In July 2013, Dunkin' Donuts opened its 500th restaurant in New York City. This location is combined with a Baskin-Robbins. While the greatest number of shops are located in the Northeastern United States, Dunkin' Donuts has since slowly expanded across to the west coast, with more shops planned for the next few years. In the U.S., there are at least 82 franchisees west of the Mississippi River, mostly in central Iowa, which is expected to have approximately 20 new locations over the next 6 years. Arizona, Nevada, New Mexico, and Texas are all expected to see new locations over the next several years as well.

What's the best answer to this question: is there a dunkin donuts in all 50 states?
no