| Abbreviation | Definition |
|---|---|
| MGBC | Martinsburg Grace Brethren Church |
| MGBC | Mountain Grove Baptist Church |
| MGBC | Myrtle Grove Baptist Church |
| MGC | Milliken Gospel Church |
| MGCB | Mechanic Grove Church of the Brethren |
| MHCC | Melrose Highlands Congregational Church |
| MHSC | Messiah Healing Sabbath Church |
| MIBC | Mackinac Island Bible Church |
| MICA | MeLord's International Christian Academy |
| MICC | Mercer Island Covenant Church |
| MIPC | Merritt Island Presbyterian Church |
| MKC | Meserete Kristos Church |
| MLC | Memorial Lutheran Church |
| MLCC | Moses Lake Christian Church |
| MLFC | Miracle Life Family Church |
| MMBC | Macedonia Missionary Baptist Church |
| MMBC | Marquette Manor Baptist Church |
| MMBC | Monroe Missionary Baptist Church |
| MNCC | Mexican National Catholic Church |
| MOBC | Mortdale Oatley Baptist Church |