The caucuses are open only to Democrats and the registration cut-off was Feb. 22. Wyoming has a total of 18 delegates (12 pledged) and 4 alternates.
"Delegates" are the delegates to the Wyoming Democratic Party 2008 State Convention in Jackson on May 23-24. Statewide, there are a total of 319 delegates to the state convention.
Here's a list of the registered voters in Wyoming as of March 4, 2008 (pdf.) Out of more than 200,000 registered voters, 59,000 are Democrats. Laramie has the most, with 11,000. Obama campaigned in Laramie, Hillary did not.
Natrona (Casper) has 8,000. Both campaigned there yesterday. Cheyenne (Albany) has 5,400. Hillary campaigned there yesterday.
I'm wondering which way Sweetwater will go. It has 7,500 registered Dems and Bill Clinton campaigned there.