I assumed a 2 hour drive and used an app that told me population within each zip in a 2 hour drive (the furthest I've driven for one, I drove it 3 times, and every time it felt worth it due to the savings on full builds), and excluded overlaps as best I could. I started at the top, and got through 10 of them before I hit 30% of the US population. There are many to go. MC knows where to put their stores. If you feel this is a worthy debate point, define your criteria better, and I will complete the test with those criteria. But I think this why MC is cited so often. They tend to be where those who want them are. Or close enough.