Full-service restaurant (FSR) sales in the United States have steadily risen over the past 20 years, reaching 291.61 billion U.S. dollars in 2017. In the same year, Denny’s sales contributed 2.73 billion dollars to the FSR industry. There are almost two thousand Denny’s restaurants operating worldwide, the majority of which are franchises. Some of the countries that Denny's has spread to include Canada, Puerto Rico, Mexico, New Zealand. However, most of the Denny’s establishments are located in the United States.
Denny’s was ranked seventh amongst the top full-service restaurants in the United States, in terms of sales, coming after other FSR chains such as Applebee’s, Olive Garden, and Buffalo Wild Wings Grill & Bar. In terms of units, the company ranked even higher, with the third highest amount of units in the United States, after Applebee’s and IHOP.