Highwood, Ill., officials believe they broke the record for most jack-o-lanterns lit at one time, a record Boston set in 2006 with 30,128 pumpkins.
Most of the pumpkins, gutted by volunteers last week, were placed on blue scaffolding that reached eight levels high in some spots.
"I think we've got it," said Eric Falberg, a councilman who organized the event. "Judging by the scaffolding, we have at least 30,000, and we aren't done yet."
The city will look over photos and videos to determine an exact number that will be submitted to Guinness World Records.
Highwood resident Nely Castrejon, 11, said she is not convinced the town broke the record, which it missed last year by about 4,000 pumpkins.
"No way, it won't happen. There were more last year," said the girl.
Castrejon's 13-year-old sister Erica disagreed. "No, there were a lot more empty shelves last year," she said.
Highwood is not the only town going for the record this year. Keene, N.H., the first town to hold the title, is also looking to set a new record.