These people carry with them a great deal of knowledge on local needs and services; they are familiar with local professional and volunteer organizations that operate in your area.
In the book Understanding Your Community by Monte Sahlin there is an entire chapter that explains how to do this. It includes a list of 50 civic leader roles that typically exist in communities in the United States, with specific questions for each of these roles. You can order this book at Center for Creative Ministry or AdventSource.