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Census data for Roskilde County
| 1787 | 4 | 54 | 957 | 21,464 | 10,807 | 50.35% | 10,657 | 49.65% | 0 | 0.00% | 0 |
| 1801 | 4 | 55 | 906 | 23,054 | 11,586 | 50.26% | 11,465 | 49.73% | 3 | 0.01% | 46 |
| 1834 | 4 | 55 | 1,012 | 29,565 | 14,918 | 50.46% | 14,645 | 49.53% | 2 | 0.01% | 0 |
| 1840 | 4 | 55 | 900 | 32,425 | 16,313 | 50.31% | 16,106 | 49.67% | 6 | 0.02% | 3,255 |
| 1845 | 4 | 55 | 1,249 | 33,471 | 16,850 | 50.34% | 16,615 | 49.64% | 6 | 0.02% | 0 |
| 1850 | 4 | 55 | 1,205 | 35,097 | 17,666 | 50.33% | 17,422 | 49.64% | 9 | 0.03% | 715 |
| 1855 | 4 | 55 | 1,629 | 15,848 | 8,106 | 51.15% | 7,740 | 48.84% | 2 | 0.01% | 1,338 |
| 1860 | 4 | 55 | 1,404 | 37,716 | 18,911 | 50.14% | 18,800 | 49.85% | 5 | 0.01% | 0 |
| 1870 | 4 | 55 | 3,294 | 9,358 | 4,760 | 50.87% | 4,592 | 49.07% | 6 | 0.06% | 7,240 |
| 1880 | 4 | 55 | 4,437 | 42,503 | 21,104 | 49.65% | 21,398 | 50.34% | 1 | 0.00% | 17,805 |
| 1890 | 4 | 55 | 5,558 | 11,533 | 5,795 | 50.25% | 5,731 | 49.69% | 7 | 0.06% | 8,884 |
| 1901 | 4 | 55 | 24,037 | 47,027 | 23,145 | 49.22% | 23,563 | 50.11% | 319 | 0.68% | 42,472 |
| 1906 | 4 | 55 | 7,553 | 48,573 | 23,891 | 49.19% | 24,677 | 50.80% | 5 | 0.01% | 48 |
| 1911 | 4 | 55 | 8,174 | 8,701 | 4,172 | 47.95% | 4,520 | 51.95% | 9 | 0.10% | 6,996 |
| 1916 | 4 | 56 | 9,346 | 5,207 | 2,345 | 45.04% | 2,848 | 54.70% | 14 | 0.27% | 4,930 |
| 1921 | 4 | 55 | 7,625 | 8,188 | 4,116 | 50.27% | 4,063 | 49.62% | 9 | 0.11% | 7,100 |
| 1925 | 4 | 55 | 18,218 | 2,042 | 1,071 | 52.45% | 955 | 46.77% | 16 | 0.78% | 265 |
| 1930 | 4 | 55 | 15,077 | 11,293 | 5,930 | 52.51% | 5,342 | 47.30% | 21 | 0.19% | 6,405 |
| 1940 | 4 | 55 | 50,977 | 5,409 | 2,791 | 51.60% | 2,543 | 47.01% | 75 | 1.39% | 302 |
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