A map, by Pantry & Larder, shows the cost of a Big Mac at each McDonald’s in the United States, as of early 2023. As you might expect, the prices are higher on the east and west coasts. The most expensive Big Mac was in Lee, Massachusetts for $8.09. I assume shipping to Hawaii and Alaska brings prices up in those states.
But what’s going on in Montana and Arizona? Based on Regional Price Parity, Montana tends to cost less compared to the national average, and Arizona is right in the middle. Then again, when you adjust for cost of living, the two states are right next to each other towards the bottom for income, so I guess it makes sense.