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Folketællinger i Slagelse købstad
| 1787 | 68 | 1.723 | 858 | 49,80% | 865 | 50,20% | 0 | 0,00% | 0 |
| 1801 | 71 | 1.733 | 841 | 48,53% | 890 | 51,36% | 2 | 0,12% | 0 |
| 1834 | 103 | 2.915 | 1.439 | 49,37% | 1.476 | 50,63% | 0 | 0,00% | 0 |
| 1840 | 106 | 3.197 | 1.585 | 49,58% | 1.608 | 50,30% | 4 | 0,13% | 0 |
| 1845 | 142 | 3.567 | 1.780 | 49,90% | 1.783 | 49,99% | 4 | 0,11% | 0 |
| 1850 | 145 | 4.011 | 1.954 | 48,72% | 2.056 | 51,26% | 1 | 0,02% | 0 |
| 1855 | 417 | 0 | 0 | 0,00% | 0 | 0,00% | 0 | 0,00% | |
| 1860 | 163 | 4.919 | 2.357 | 47,92% | 2.562 | 52,08% | 0 | 0,00% | 0 |
| 1870 | 728 | 5.502 | 2.629 | 47,78% | 2.872 | 52,20% | 1 | 0,02% | 5.502 |
| 1880 | 1.072 | 6.134 | 2.911 | 47,46% | 3.223 | 52,54% | 0 | 0,00% | 4.927 |
| 1890 | 1.851 | 6.892 | 3.238 | 46,98% | 3.652 | 52,99% | 2 | 0,03% | 6.743 |
| 1901 | 2.497 | 9.107 | 4.189 | 46,00% | 4.918 | 54,00% | 0 | 0,00% | 7.659 |
| 1906 | 2.634 | 3 | 1 | 33,33% | 2 | 66,67% | 0 | 0,00% | 0 |
| 1911 | 3.009 | 13 | 4 | 30,77% | 9 | 69,23% | 0 | 0,00% | 0 |
| 1916 | 4.050 | 6 | 1 | 16,67% | 5 | 83,33% | 0 | 0,00% | 0 |
| 1921 | 3.121 | 13 | 6 | 46,15% | 7 | 53,85% | 0 | 0,00% | 0 |
| 1925 | 5.181 | 7 | 3 | 42,86% | 4 | 57,14% | 0 | 0,00% | 0 |
| 1930 | 8.292 | 11 | 7 | 63,64% | 4 | 36,36% | 0 | 0,00% | 0 |
| 1940 | 10.702 | 12 | 6 | 50,00% | 6 | 50,00% | 0 | 0,00% | 0 |
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