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Folketællinger i Mern sogn
| 1787 | 24 | 706 | 362 | 51,27% | 344 | 48,73% | 0 | 0,00% | 0 |
| 1801 | 23 | 801 | 399 | 49,81% | 402 | 50,19% | 0 | 0,00% | 0 |
| 1834 | 39 | 1.134 | 565 | 49,82% | 569 | 50,18% | 0 | 0,00% | 0 |
| 1840 | 34 | 1.150 | 571 | 49,65% | 579 | 50,35% | 0 | 0,00% | 0 |
| 1845 | 31 | 1.157 | 574 | 49,61% | 583 | 50,39% | 0 | 0,00% | 0 |
| 1850 | 35 | 1.138 | 559 | 49,12% | 579 | 50,88% | 0 | 0,00% | 0 |
| 1855 | 36 | 1.208 | 588 | 48,68% | 619 | 51,24% | 1 | 0,08% | 0 |
| 1860 | 22 | 1.270 | 622 | 48,98% | 648 | 51,02% | 0 | 0,00% | 0 |
| 1870 | 75 | 1.328 | 651 | 49,02% | 677 | 50,98% | 0 | 0,00% | 1.328 |
| 1880 | 93 | 1.337 | 614 | 45,92% | 723 | 54,08% | 0 | 0,00% | 1.337 |
| 1890 | 116 | 1.323 | 617 | 46,64% | 706 | 53,36% | 0 | 0,00% | 1.323 |
| 1901 | 851 | 1.235 | 608 | 49,23% | 627 | 50,77% | 0 | 0,00% | 1.235 |
| 1906 | 109 | 1.358 | 662 | 48,75% | 689 | 50,74% | 7 | 0,52% | 0 |
| 1911 | 123 | 1.324 | 634 | 47,89% | 690 | 52,11% | 0 | 0,00% | 1.235 |
| 1916 | 125 | 1.338 | 621 | 46,41% | 710 | 53,06% | 7 | 0,52% | 1.338 |
| 1921 | 113 | 1.367 | 660 | 48,28% | 707 | 51,72% | 0 | 0,00% | 1.367 |
| 1925 | 143 | 1.375 | 681 | 49,53% | 694 | 50,47% | 0 | 0,00% | 1.375 |
| 1930 | 107 | 1.346 | 697 | 51,78% | 649 | 48,22% | 0 | 0,00% | 1.225 |
| 1940 | 730 | 1.331 | 699 | 52,52% | 632 | 47,48% | 0 | 0,00% | 1.331 |
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