However, In Furry Tales, Jon is supposed to be 20 going on 21.
Jon's neighbor had a dog when Jon was a child named "Scraps" who chased a stick into a thresher. Garfield remarked that he lived up to his name.
A few comic strips have Jon wearing contact lenses.
The most common meal that Jon is seen eating is mashed potatoes, peas, and meatloaf. Garfield tends to steal it from him. The reasons vary from Garfield preferring Jon's dinner over his own dinner (cat food in a green bowl), or Garfield still being hungry after eating his own dinner.
There is an ongoing comic strip that began in 2008 entitled "Garfield Minus Garfield", in which Jon is the main character featured and most of the other characters have been removed. In the strip Garfield is depicted as Jon's imaginary friend who only he can see. A running gag has Jon appearing to be talking to himself or having sudden mood swings making him appear insane, or sometimes depressed and seemingly suicidal. Jim Davis is a fan of the strip and sometimes contributes to the site.
Jim Davis says that Jon cannot understand Garfield's thoughts but rather his actions. This is because he wanted a realistic cat and not one that talks.
On the fourth Friday of November, Jon and Garfield have Candy Cane Karaoke Night.
Since Jon's only sibling Doc Boy is not shown to be married or have kids, it is unknown how Jon has nieces and nephews, as shown in some of the comic strips, one episode of Garfield and Friends, and The Garfield Show.
On December 3rd, 1999, Jon Arbuckle attempted to chat under the name Stephano. As Stephano, he claims to be "very rich and macho." However, no one else on chat falls for this, as they all leave the chat room quickly.
Jon's favorite coffee is decaffeinated.
Jon has occasionally shown religious aspects of his life, e.g. when shown praying in the April 29, 1987 strip and with his family at dinner in A Garfield Christmas.
In the earlier years of the comic strip, Jon could occasionally be seen with a pipe.
Jon took his mother to his high school prom. Another year he went with his friend Wheezer.
In the DTV films, Jon is shown to have freckles.
Jon's license plate in the DTV movies is Jon 731.
In The Big Sneeze, tests reveal that Jon is allergic to "Antelope, goldenrod and grilled asparagus".