| Castle Methodist Church | | — | — | — | |
| Castle Oaks Covenant Church | | — | — | — | |
| Castle Rock Baptist Church | | — | — | — | |
| Castle Rock Christian Church | | — | 542 Huntington Avenue South, Castle Rock, WA 98611 | — | |
| Castle Rock Seventh-day Church | | — | 7531 Old Pacific Highway North, Castle Rock, 98611 | — | |
| Castle Rock United Methodist | | — | — | — | |
| Castle Run Church | | — | — | — | |
| Castle Saunderson Church of Ireland | | — | — | — | |
| Castle Shannon United Methodist Church | | — | 3750 Myrtle Avenue, Pittsburgh, PA 15234 | — | |
| Castle Square United Reformed Church | | — | Castle Street, Pontypridd, CF37 1TA | — | |
| Castle Street Church Of Scotland | | — | — | — | |
| Castle Street Methodist Church | | — | Castle Street, Cambridge, CB3 0AH | — | |
| Castle View Church | | — | — | — | |
| Castlebar Christian Fellowship | | — | — | — | |
| Castleberry Baptist Church | | — | 1250 North Jim Wright Freeway, White Settlement, TX 76108 | — | |
| Castleberry Church | | — | — | — | |
| Castleberry Church of Christ | | — | — | — | |
| Castleberry Memorial Chapel | | — | — | — | |
| Castleberry Memorial Congregational Church | | — | — | — | |
| Castleberry Road Baptist Church | | — | — | — | |
| Castledaly Church | | — | — | — | |
| Castlederg Baptist | | — | Upper Strabane Road, Strabane | — | |
| Castlederg Elim Church | | — | Fyfin Road, Castlederg | — | |
| Castlederg Free Presbyterian Church | | — | — | — | |
| Castlederg Methodist Church | | — | The Diamond | — | |
| Castledowns Baptist Church | | — | — | — | |
| Castlefields Church | | — | Traffic Street, Derby, DE1 2NL | — | |
| Castlefleming (C of I) | | — | — | — | |
| Castleford Christadelphian Hall | | — | Nicholson Street, WF10 5DQ | — | |
| Castlegar Baptist Church | | — | — | — | |
| Castlegar Mennonite Church | | — | — | — | |
| Castlehead Parish Church | | — | — | — | |
| Castlehill Parish Church | | — | Ayr, KA7 3LW | — | |
| Castlemaine Church of Christ | | — | — | — | |
| Castlemaine Uniting Church | | — | — | — | |
| Castleman Run Church | | — | — | — | |
| Castlemont Bible Chapel | | — | 2530 90th Avenue, Oakland | — | |
| Castlereagh Baptist Church | | — | Castlereagh Road, Belfast | — | |
| Castlereagh Fellowship | | — | — | — | |
| Castlereagh Gospel Hall | | — | Church Road, Belfast | — | |
| Castlereagh Presbyterian Church | | — | Church Road, Castlereagh | — | |
| Castlerock Presbyterian Church | | — | Circular Road | — | |
| Castles Chapel | | — | — | — | |
| Castleterra Parish Church | | — | — | — | |
| Castlethorpe SS Simon and Jude | | — | North Street, Castlethorpe, MK19 7EW | — | |
| Castleton Baptist Church | | — | 12 St Mellons Road, Cardiff, CF3 2TX | — | |
| Castleton Baptist Church Fellowship | | — | Newport | — | |
| Castleton Chapel | | — | — | — | |
| Castleton Church of the Nazarene | | — | — | — | |
| Castleton Community Church | | — | 5825 East 91st Street, Indianapolis, IN 46250 | — | |