Language Details: Lisp

Lisp is a family of computer programming languages with a long history and a distinctive, fully parenthesized Polish prefix notation.

Lisp article on Wikipedia
Code Jam 2008 Contestants using Lisp
Qualification Round
Used in 58 solutions by 16 contestants:
Round 1A
Used in 10 solutions by 3 contestants:
Round 1B
Used in 5 solutions by 3 contestants:
Round 1C
Used in 8 solutions by 4 contestants:
Round 2
Used in 9 solutions by 3 contestants:
Round 3
Used in 6 solutions by 2 contestants:
AMER Semifinal
Used in 3 solutions by 1 contestants:

Submission Origin

United States (9 contestants)
Germany (2 contestants)
Japan (2 contestants)
Canada (1 contestant)
France (1 contestant)
Hungary (1 contestant)
Mexico (1 contestant)