Wednesday is the first day of summer, and one delivery service wants to help Atlantans get in the mood.

Postmates is delivering free hamburgers or hot dogs to the first 7,000 new users who download the app and order now through Sunday, according to NationalToday.com. The web site, which "keeps track of the special moments and quirky occasions on the cultural calendar," partnered with the delivery app to rank U.S. cities for their love of the hot dog.

The study used different factors, such as the total number of summer hot dog Postmates deliveries in the past year, to decide. Atlanta came in at No. 19 out of 39, with St. Louis taking the No. 1 spot.

To get your meal, add any hamburger or hot dog offered from the app's selection to your cart. Then use code "summersun" to get up to $20 off.

Postmates launched in Atlanta in May 2015. It services Alpharetta, Atlanta, Decatur, Dunwoody, Johns Creek, Norcross, Roswell and Sandy Springs. Check to see if you live in the delivery zone by entering your address. 

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