Townland of Ballyvennaght which contains Slieve Pin Clachan
| Year | Population | Houses |
| 1841 | 256 | 51 |
| 1851 | 237 | 41 |
| 1861 | 214 | 41 |
| 1871 | 213 | 38 |
| 1881 | 202 | 36 |
| 1891 | 186 | 33 |
| 1901 | 152 | 34 |
| 1911 | 120 | 29 |
| 1926 | 102 | 25 |
These figures have been copied from the official Census of Population of Ireland for each of the years.