You know you've always wondered. Alas, we have no Waffle Houses in Iowa - it would appear that our allotment went mostly to Alabama, Mississippi and Georgia, where there are fewer than 200,000 residents per Waffle House. Artist Cat and Girl is selling an 11x14" print of this enlightening map for $12 if you find it's a must-have for your house (kitchen art, maybe?).
Link
If you want one in Iowa, franchise opportunities are no doubt available.
Do you really think the food at a Tim Horton's, for instance, is more nutritious? WH isn't haute cuisine, it's a 24/7/365 grill. And I'll have my hash browns scattered and covered, please.