| BUT POINT | OS1/23/22/143 |
| CAIRSTON | OS1/23/22/80 |
| CAIRSTON ROADS | OS1/23/22/138 |
| CARLINGHILL | OS1/23/22/68 |
| CASTLE OF FOLLY | OS1/23/22/115 |
| CASTLE OF NORTH GAULTON | OS1/23/22/5 |
| CASTLE [a farm] | OS1/23/22/96 |
| CAULDHAME | OS1/23/22/41 |
| CAULDHAME | OS1/23/22/33 |
| CHAPEL (In Ruins) [Stromness] | OS1/23/22/148 |
| CHURCH ROAD [Stromness] | OS1/23/22/134 |
| CHURCH [Stromness] | OS1/23/22/126 |
| CITADEL | OS1/23/22/152 |
| CLOOK | OS1/23/22/109 |
| CLOUSTER | OS1/23/22/121 |
| CLOVIGARTH | OS1/23/22/8 |
| COMMERCIAL BANK OF SCOTLAND [Stromness] | OS1/23/22/139 |
| COMMERCIAL HOTEL [Stromness] | OS1/23/22/133 |
| CONGESQUOY | OS1/23/22/89 |
| COTT | OS1/23/22/42 |
