"The Dundies" originally aired on NBC in the United States on September 20, 2005. In its original American broadcast, the episode received a 4.3/10% share among adults between the ages of 18 and 49. This means that it was seen by 2.4% of all 18- to 49-year-olds, and 6% of all 18- to 49-year-olds watching television at the time of the broadcast. The episode was seen by 9.0 million viewers, making it the highest-rated episode of the series since the show's pilot episode.