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Folketællinger i Mern sogn
| 1787 | 24 | 706 | 360 | 50,99% | 346 | 49,01% | 0 | 0,00% | 0 |
| 1801 | 23 | 801 | 400 | 49,94% | 401 | 50,06% | 0 | 0,00% | 0 |
| 1834 | 39 | 1.134 | 565 | 49,82% | 569 | 50,18% | 0 | 0,00% | 0 |
| 1840 | 34 | 1.150 | 570 | 49,57% | 580 | 50,43% | 0 | 0,00% | 0 |
| 1845 | 31 | 1.157 | 574 | 49,61% | 583 | 50,39% | 0 | 0,00% | 0 |
| 1850 | 35 | 1.138 | 558 | 49,03% | 580 | 50,97% | 0 | 0,00% | 0 |
| 1855 | 36 | 1.208 | 589 | 48,76% | 619 | 51,24% | 0 | 0,00% | 0 |
| 1860 | 22 | 1.270 | 625 | 49,21% | 645 | 50,79% | 0 | 0,00% | 0 |
| 1870 | 75 | 1.328 | 651 | 49,02% | 677 | 50,98% | 0 | 0,00% | 1.328 |
| 1880 | 93 | 1.337 | 625 | 46,75% | 712 | 53,25% | 0 | 0,00% | 1.271 |
| 1890 | 116 | 1.323 | 618 | 46,71% | 705 | 53,29% | 0 | 0,00% | 1.271 |
| 1901 | 851 | 1.235 | 606 | 49,07% | 629 | 50,93% | 0 | 0,00% | 0 |
| 1906 | 109 | 1.358 | 656 | 48,31% | 695 | 51,18% | 7 | 0,52% | 0 |
| 1911 | 123 | 1.324 | 635 | 47,96% | 689 | 52,04% | 0 | 0,00% | 1.134 |
| 1916 | 125 | 1.338 | 625 | 46,71% | 710 | 53,06% | 3 | 0,22% | 1.288 |
| 1921 | 113 | 1.367 | 659 | 48,21% | 708 | 51,79% | 0 | 0,00% | 1.367 |
| 1925 | 143 | 1.375 | 678 | 49,31% | 697 | 50,69% | 0 | 0,00% | 1.375 |
| 1930 | 107 | 1.346 | 698 | 51,86% | 648 | 48,14% | 0 | 0,00% | 942 |
| 1940 | 730 | 1.330 | 701 | 52,71% | 629 | 47,29% | 0 | 0,00% | 1.270 |
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