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Folketællinger i Skælskør købstad
| 1787 | 24 | 501 | 239 | 47,70% | 262 | 52,30% | 0 | 0,00% | 0 |
| 1801 | 30 | 567 | 277 | 48,85% | 290 | 51,15% | 0 | 0,00% | 0 |
| 1834 | 40 | 850 | 408 | 48,00% | 442 | 52,00% | 0 | 0,00% | 0 |
| 1840 | 28 | 942 | 480 | 50,96% | 462 | 49,04% | 0 | 0,00% | 0 |
| 1845 | 32 | 965 | 514 | 53,26% | 451 | 46,74% | 0 | 0,00% | 0 |
| 1850 | 50 | 1.146 | 584 | 50,96% | 554 | 48,34% | 8 | 0,70% | 0 |
| 1855 | 2 | 22 | 8 | 36,36% | 14 | 63,64% | 0 | 0,00% | 22 |
| 1860 | 49 | 1.533 | 746 | 48,66% | 786 | 51,27% | 1 | 0,07% | 0 |
| 1870 | 319 | 1.704 | 830 | 48,71% | 874 | 51,29% | 0 | 0,00% | 1.704 |
| 1880 | 377 | 1.928 | 931 | 48,29% | 997 | 51,71% | 0 | 0,00% | 1.923 |
| 1890 | 647 | 2.272 | 1.073 | 47,23% | 1.199 | 52,77% | 0 | 0,00% | 2.272 |
| 1901 | 844 | 2.561 | 1.206 | 47,09% | 1.354 | 52,87% | 1 | 0,04% | 1.336 |
| 1906 | 861 | 2.544 | 1.196 | 47,01% | 1.348 | 52,99% | 0 | 0,00% | 0 |
| 1911 | 935 | 95 | 42 | 44,21% | 49 | 51,58% | 4 | 4,21% | 0 |
| 1916 | 1.066 | 0 | 0 | 0,00% | 0 | 0,00% | 0 | 0,00% | |
| 1921 | 819 | 0 | 0 | 0,00% | 0 | 0,00% | 0 | 0,00% | |
| 1925 | 1.206 | 4 | 2 | 50,00% | 1 | 25,00% | 1 | 25,00% | 0 |
| 1930 | 1.792 | 2.862 | 1.365 | 47,69% | 1.497 | 52,31% | 0 | 0,00% | 2.708 |
| 1940 | 1.937 | 0 | 0 | 0,00% | 0 | 0,00% | 0 | 0,00% | |
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