"Jayme remains missing and endangered and has been added to the top of the FBI's Missing Persons list, and is now on digital billboards nationwide", the sheriff's department said in a statement Sunday.
The sheriff's department received a 911 call from Jayme's mother early on the morning of October 15.
Jayme, said police, disappeared after the shooting and is considered to be in danger and not a runaway.
Closs went missing last week after a mysterious 911 call was made from her home in Barron, Wisconsin - where her parents, 56-year-old James and 46-year-old Denise, were found murdered.
Thirteen-year-old Jayme Closs has been missing for one week.
He said when the deputies arrived at the house, James was found dead at the door.
Meanwhile, deputies searched the area around the family's home with drones and infrared equipment and talked to Jayme's friends and middle school classmates, hoping to develop some leads.
On Friday, investigators released a log of the 911 call, which was inaudible except for screaming in the background.
Closs' parents were shot and their deaths have been ruled homicides, Fitzgerald said Wednesday.
Over a thousand tips have poured in to the Federal Bureau of Investigation and local police in the past seven days, while details of a 911 call made from the cell phone of Jayme's mother has shed new light on the exact time that the teenager disappeared from her family home.
"They are the experts in breaking down 911 tapes, looking at our phones and taking care of all evidence in that manner", he said.
Hours earlier, Fitzgerald asked for 100 volunteers to participate in Thursday's search, which took place about 3 miles from the family's home, according to CNN affiliate WCCO.
The gun used to kill the Closs parents has not been located.
In the week since she vanished, over 1,200 tips have been submitted, the sheriff's office said. Anyone with information can call the tip line at 1-855-744-3879.