...
Pittsburgh Clojure Users GroupWestern Mass. Developer's Group
There are a number of people who at least tinker with Clojure (and JRuby,
and Scala, and F#, and mad-scientist experimental PHP hacks, etc)
Functional Programming Connoisseurs (Western Massachusetts & surrounds)
Welcoming all FP-ers (Erlang/Scheme/Scala/Haskell/etc etc etc), but Clojure fans generally form a plurality.
Midwest
...
Italia - Italian Clojure User Group
Netherlands
...
Amsterdam Clojurians (Twitter: @amsclj)
Norway
Oslo Socially Functional Programmers
Slovakia - Bratislava Clojure
...