The Hickory House clientele is quite diverse. On both occasions I saw police officers, truckers, farmers and professionals. I even spotted a local television personality having a quiet lunch. Most diners seems to be regulars. As for atmosphere, well, don't expect much.
More emphasis is placed on keeping the food good and the prices low than on atmosphere and decor.
You even have to step outside to gain access to the restrooms. The service is mixed. Diners seat themselves. Menus are available for breakfast service, but you need to ask for one. Our servers were friendly and pleasant and quick to refill our beverages.