Census data for Idestrup parish
| 1787 | 20 | 964 | 481 | 49.90% | 483 | 50.10% | 0 | 0.00% | 0 |
| 1801 | 25 | 1,042 | 523 | 50.19% | 519 | 49.81% | 0 | 0.00% | 0 |
| 1834 | 47 | 1,318 | 653 | 49.54% | 665 | 50.46% | 0 | 0.00% | 0 |
| 1840 | 43 | 1,426 | 734 | 51.47% | 692 | 48.53% | 0 | 0.00% | 0 |
| 1845 | 51 | 1,490 | 774 | 51.95% | 716 | 48.05% | 0 | 0.00% | 0 |
| 1850 | 49 | 1,590 | 804 | 50.57% | 786 | 49.43% | 0 | 0.00% | 13 |
| 1855 | 74 | 0 | 0 | 0.00% | 0 | 0.00% | 0 | 0.00% | |
| 1860 | 43 | 1,707 | 874 | 51.20% | 833 | 48.80% | 0 | 0.00% | 0 |
| 1870 | 93 | 0 | 0 | 0.00% | 0 | 0.00% | 0 | 0.00% | |
| 1880 | 129 | 1,817 | 914 | 50.30% | 903 | 49.70% | 0 | 0.00% | 1,231 |
| 1890 | 136 | 1,830 | 928 | 50.71% | 902 | 49.29% | 0 | 0.00% | 0 |
| 1901 | 1,160 | 1,784 | 882 | 49.44% | 902 | 50.56% | 0 | 0.00% | 1,784 |
| 1906 | 152 | 1,417 | 728 | 51.38% | 689 | 48.62% | 0 | 0.00% | 0 |
| 1911 | 163 | 0 | 0 | 0.00% | 0 | 0.00% | 0 | 0.00% | |
| 1916 | 193 | 0 | 0 | 0.00% | 0 | 0.00% | 0 | 0.00% | |
| 1921 | 156 | 0 | 0 | 0.00% | 0 | 0.00% | 0 | 0.00% | |
| 1925 | 206 | 2,107 | 1,073 | 50.93% | 1,034 | 49.07% | 0 | 0.00% | 2,107 |
| 1930 | 151 | 0 | 0 | 0.00% | 0 | 0.00% | 0 | 0.00% | |
| 1940 | 1,056 | 0 | 0 | 0.00% | 0 | 0.00% | 0 | 0.00% | |