Oregon is the 10th most expensive state in the U.S. for fast food, with affordability rankings generally aligning with the overall cost of living in the state, according to researchers. The cheapest state in the country for fast food is Mississippi, scoring 10/10, offering consistently budget-friendly takeout prices for residents. California ranks as the most expensive, with an overall score of 0.41. McDonald’s is the Most Expensive Fast Food OutletThe most expensive fast food outlet in the Beaver state is McDonald’s, where prices were higher than average at 5.11. The Top 10 Least Affordable States for Fast Food