Census data for Eysturoy (Østerø)
| 1801 | 8 | 30 | 1,217 | 610 | 50.12% | 602 | 49.47% | 5 | 0.41% | 0 |
| 1834 | 8 | 45 | 1,603 | 804 | 50.16% | 799 | 49.84% | 0 | 0.00% | 1,603 |
| 1840 | 8 | 68 | 1,593 | 789 | 49.53% | 804 | 50.47% | 0 | 0.00% | 352 |
| 1845 | 8 | 60 | 1,909 | 948 | 49.66% | 959 | 50.24% | 2 | 0.10% | 1,909 |
| 1850 | 8 | 52 | 1,994 | 996 | 49.95% | 997 | 50.00% | 1 | 0.05% | 0 |
| 1860 | 8 | 75 | 0 | 0 | 0.00% | 0 | 0.00% | 0 | 0.00% | |
| 1870 | 8 | 188 | 0 | 0 | 0.00% | 0 | 0.00% | 0 | 0.00% | |
| 1880 | 8 | 258 | 2,656 | 1,316 | 49.55% | 1,339 | 50.41% | 1 | 0.04% | 2,656 |
| 1890 | 8 | 422 | 0 | 0 | 0.00% | 0 | 0.00% | 0 | 0.00% | |
| 1901 | 8 | 1,937 | 0 | 0 | 0.00% | 0 | 0.00% | 0 | 0.00% | |
| 1906 | 8 | 478 | 0 | 0 | 0.00% | 0 | 0.00% | 0 | 0.00% | |
| 1911 | 8 | 590 | 0 | 0 | 0.00% | 0 | 0.00% | 0 | 0.00% | |
| 1916 | 8 | 606 | 0 | 0 | 0.00% | 0 | 0.00% | 0 | 0.00% | |
| 1921 | 8 | 462 | 0 | 0 | 0.00% | 0 | 0.00% | 0 | 0.00% | |
| 1925 | 8 | 772 | 24 | 11 | 45.83% | 9 | 37.50% | 4 | 16.67% | 0 |