Sonic headquarters are here in Oklahoma, where they started. They have spread over a number of states but aren’t everywhere. When my grandson visits from Washington DC he insists that his first and last stops in OK are at Sonic (in between he wants to visit Braum’s which also started here). Sonic IS great. They forgot to mention their bacon cheeseburger on Texas toast. And their shakes made with your choice of crushed candies or cookies (like Oreos). Where are my car keys?