1913 is a year referenced in the series. Events of the year include:
- Mabel Thompson committed suicide in January 19, aged 28. ("Boardwalk Empire", "A Return to Normalcy")
- Manny Horvitz begins working with Waxey Gordon. Their relationship goes awry by 1921. ("What Does the Bee Do?")
- Victor Sickles contacts Eli Thompson, interested in joining some police force in New Jersey. He eventually becomes Sheriff of Tabor Heights. ("Spaghetti and Coffee")