Alliance members come from the following churches and organizations:
| St. Anthony, East Falmouth | Our Lady of Victory, Centerville |
| Bay Community Alliance, Bourne | River of Life Ministries, Yarmouth |
| Christ the King, Mashpee | Sacred Heart, Yarmouth Port |
| Corpus Christi, East Sandwich | St. Elizabeth Ann Seton, North Falmouth |
| Grace Church, Dennis | St. Joan of Arc, Orleans |
| Holy Redeemer, Chatham | Cape Faith Church, Barnstable |
| Falmouth Baptist Church, Falmouth | St. Joseph, Falmouth |
| Knights of Columbus | St. Margaret of Scotland, Buzzards Bay |
| Our Lady of the Assumption, Osterville | St. Peter the Apostle, Provincetown |
| Lighthouse Christian Fellowship, Sandwich | St. Pius X, South Yarmouth |
| Our Lady of the Cape, Brewster | Friends of the Unborn, Quincy |
| St. John the Evangelist, Bourne | St. Francis Xavier, Hyannis |
| Cape Cod Church, Falmouth | Holy Trinity, Harwich |
| Our Lady of Lourdes, Wellfleet | The New Testament Church of Cedarville, Plymouth |