This is just a start. The following churches participated in the initial Great Co-Mission conference or have joined since.

Church Address Additional Information
 Paoli Presbyterian Church 225 S. Valley Road
Paoli, PA 19301
The Church of the Good Samaritan 212 West Lancaster Avenue
Paoli, PA 19301
 Central Presbyterian Church  100 W. Uwchlan Ave.
DowningtownPA 19335
Blue Route Vineyard  425 W Front Street
Media, PA 19063
 Narberth Presbyterian Church  205 Grayling Avenue 
Narberth, PA 19072
Ardmore Presbyterian  5 W Montgomery Ave, Ardmore, PA 19003  
 Paoli United Methodist Church
81 Devon Road
PaoliPA 19301
Mount Zion AME Church
 380 North Fairfield Road
Devon, PA 19301
Second Presbyterian 114 S. Walnut St.
West Chester, Pa 1938
Westminster Presbyterian  10 W Pleasant Grove Rd
West Chester, PA 19382
 Valley Forge Presbyterian  191 Town Center Rd
King of Prussia, PA 19406
Main Line Christian Assembly 25 Ruthland Avenue
Malvern, PA 19355
 First Presbyterian  130 W Miner St
West Chester, PA 19382
St John's Presbyterian  7 Berkley Rd
Devon, PA 19333