During the summer of 1920, F. Scott Fitzgerald and his wife, Zelda, lived in a rental house on South Compo Road in Westport, CT. A writer and a filmmaker make an argument that Gatsby was inspired by Westport, CT, and that Westport was really the inspiration for the fictional setting of the West Egg. It is not clear where the writer, Richard Webb, Jr., believes the fictional East Egg is supposed to be, or how to reconcile the Westport location with the Valley of Ashes. https://www.ctpost.com/living/article/Is-Westport-the-West-Egg-in-the-F-Scott-12926064.php This theory is published in Boats Against the Current (Centennial Edition): The Honeymoon Summer of Scott and Zelda: Westport, Connecticut 1920, Prospecta Press, 2018. https://www.amazon.com/Boats-Against-Current-Honeymoon-Connecticut/dp/1632260972 Richard Webb, Jr. has a presentation linked here: https://www.youtube.com/watch?v=l-f5CvfI6p4