Don't be surprised if Thor, Captain America, Iron Man, Hulk and Batman show up at the door sometime soon.
Managers of local costume shops said Marvel's Avengers and DC Comics' Dark Knight are the top picks among children this year.
"We haven't been able to keep them in stock," said Jaclyn Bruce, manager of the Spirit Halloween costume shop in the York Galleria.
Kerry Johnson, manager of the Party City in Springettsbury Township, agreed it's "hard to keep them on the shelf."
And those superheroes also make the most popular costumes at the Spirit Halloween location in the Carlisle Commerce Center in West Manchester Township, according to employee Brandy Dillet.
Monster girls: Most girls are choosing to don outfits from the fleet of Monster High dolls, Johnson said.
"They seriously fly off the shelf like nobody's business," he said.
The other costume shop managers agreed Monster High is a popular theme among young girls, and Disney princess costumes still reign supreme among some of the youngest trick-or-treaters.
Two TV shows having an impact on sales this year. They are AMC's "The Walking Dead," which follows a band of survivors as they navigate their surroundings after a zombie apocalypse; and Cartoon Network's "Adventure Time," which tells the story of 14-year-old Finn and his dog Jake, who live in a magical world among Princess Bubblegum, Lady Rainicorn, The Ice King, Marceline the Vampire Queen and more.
Zombies: Many adults have gone to Spirit in the Galleria looking for zombie costumes and makeup, Bruce said.
"Because of 'The Walking Dead,' zombies were huge last year and this year," she said.
The popularity of "Adventure Time" characters is spiking this year, she said.
"Children and adults both want to wear these costumes," Bruce said.
Covered up: Morphsuits are another popular choice among adults, Johnson said.
Sold in a variety of colors, the spandex suits cover the wearer from head to toe.
"You can see through them, drink through them and breathe through them," he said.
Their shelf life extends beyond Halloween, as many purchasers also wear them to athletic events in their favorite team's colors, Johnson said.
Politics, too: His store has also been selling a decent number of political costumes, he said.
A rack of masks resembling the likeness of President Barack Obama and Gov. Mitt Romney was scantily stocked on Monday.
"The Obama mask sells a little more than the Romney mask," Johnson said.
-- Candy Woodall can also be reached at firstname.lastname@example.org.