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Folketællinger i Korsør købstad
| 1787 | 46 | 1.269 | 604 | 47,60% | 665 | 52,40% | 0 | 0,00% | 0 |
| 1801 | 79 | 1.219 | 578 | 47,42% | 641 | 52,58% | 0 | 0,00% | 0 |
| 1834 | 57 | 1.402 | 678 | 48,36% | 722 | 51,50% | 2 | 0,14% | 0 |
| 1840 | 1 | 441 | 214 | 48,53% | 227 | 51,47% | 0 | 0,00% | 441 |
| 1845 | 60 | 1.612 | 819 | 50,81% | 793 | 49,19% | 0 | 0,00% | 0 |
| 1850 | 60 | 1.815 | 1.169 | 64,41% | 645 | 35,54% | 1 | 0,06% | 0 |
| 1855 | 132 | 16 | 5 | 31,25% | 8 | 50,00% | 3 | 18,75% | |
| 1860 | 87 | 2.961 | 1.479 | 49,95% | 1.482 | 50,05% | 0 | 0,00% | 0 |
| 1870 | 681 | 137 | 51 | 37,23% | 54 | 39,42% | 32 | 23,36% | |
| 1880 | 772 | 4.989 | 2.465 | 49,41% | 2.466 | 49,43% | 58 | 1,16% | 0 |
| 1890 | 1.302 | 2.343 | 1.141 | 48,70% | 1.202 | 51,30% | 0 | 0,00% | 2.309 |
| 1901 | 1.815 | 6.146 | 3.057 | 49,74% | 3.089 | 50,26% | 0 | 0,00% | 4.884 |
| 1906 | 2.078 | 2.942 | 1.447 | 49,18% | 1.495 | 50,82% | 0 | 0,00% | 0 |
| 1911 | 2.626 | 3 | 2 | 66,67% | 1 | 33,33% | 0 | 0,00% | |
| 1916 | 2.879 | 19 | 10 | 52,63% | 9 | 47,37% | 0 | 0,00% | 0 |
| 1921 | 2.179 | 0 | 0 | 0,00% | 0 | 0,00% | 0 | 0,00% | |
| 1925 | 3.761 | 18 | 14 | 77,78% | 3 | 16,67% | 1 | 5,56% | |
| 1930 | 5.904 | 0 | 0 | 0,00% | 0 | 0,00% | 0 | 0,00% | |
| 1940 | 6.498 | 4 | 2 | 50,00% | 2 | 50,00% | 0 | 0,00% | 0 |
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