Language Details: Clojure

Clojure is a dialect of Lisp that targets the Java Virtual Machine.

Official website (see also: Wikipedia article)
Code Jam 2009 Contestants using Clojure
Qualification Round
Used in 20 solutions by 6 contestants:
Round 1B
Used in 3 solutions by 1 contestants:
Round 1C
Used in 3 solutions by 2 contestants:

Submission Origin

Poland (2 contestants)
Denmark (1 contestant)
Germany (1 contestant)
Japan (1 contestant)
United States (1 contestant)