The Irish population taken from various census results, and estimates.
| Eire | |
| Year | Population |
| 2011 | 4,580,000 |
| 2006 | 4,240,000 |
| 2002 | 3,920,000 |
| 1996 | 3,630,000 |
| 1991 | 3,530,000 |
| 1986 | 3,540,000 |
| 1981 | 3,440,000 |
| 1979 | 3,370,000 |
| 1971 | 2,980,000 |
| 1966 | 2,880,000 |
| 1961 | 2,820,000 |
| 1956 | 2,900,000 |
| 1951 | 2,960,000 |
| 1946 | 2,960,000 |
| 1936 | 2,970,000 |
| 1926 | 2,970,000 |
| 1911 | 3,140,000 |
| 1901 | 3,220,000 |
| 1891 | 3,470,000 |
| 1881 | 3,870,000 |
| 1871 | 4,050,000 |
| 1861 | 4,400,000 |
| 1851 | 5,110,000 |
| 1841 | 6,530,000 |
These population figures show an unusual drop in population, but this was caused by the potato famine and the massive emigration of many Irish to other countries at that time.
70.1 - 873,689
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