 In 2011, 652 congregations from all 50 states and the District of Columbia as well as 13 countries participated in Evolution Weekend activities.Zimmerman and the Clergy Letter Project maintain a list of 1,052 scientists from all 50 states, the District of Columbia, Puerto Rico, and 32 countries, who have agreed to serve as "technical consultants to clergy members who have questions about the science associated with all aspects of evolution.