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