If at all possible, lists should have the names of the pastor, priest, rabbi, or imam. Denominational directories are the best source for this. The most complete list of all congregations is in the Yellow Pages. None have zip codes. Obtaining these from a zip code directory is a volunteer job.
Associations are also a good source.
Some of these are the local affiliates of The National Sunday School Association, National Association of Evangelicals, National Council of Churches and the National Council of Christians and Jews. The most effective method of assuring a good attendance is through follow-up phone calls. This is also the most difficult to implement. A method by which each volunteer has only to make a very few calls to people with whom he or she feels comfortable is the best. Attempts to involve the religious community in victim services can be very rewarding.