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Census data for Roskilde County
| 1787 | 4 | 54 | 921 | 21,464 | 10,791 | 50.27% | 10,673 | 49.73% | 0 | 0.00% | 31 |
| 1801 | 4 | 55 | 906 | 23,054 | 11,560 | 50.14% | 11,491 | 49.84% | 3 | 0.01% | 0 |
| 1834 | 4 | 55 | 1,012 | 30,429 | 15,327 | 50.37% | 15,093 | 49.60% | 9 | 0.03% | 0 |
| 1840 | 4 | 55 | 900 | 32,437 | 16,313 | 50.29% | 16,111 | 49.67% | 13 | 0.04% | 3,268 |
| 1845 | 4 | 55 | 1,249 | 33,471 | 16,834 | 50.29% | 16,632 | 49.69% | 5 | 0.01% | 0 |
| 1850 | 4 | 55 | 1,205 | 35,097 | 17,623 | 50.21% | 17,465 | 49.76% | 9 | 0.03% | 0 |
| 1855 | 4 | 55 | 1,629 | 20,194 | 10,311 | 51.06% | 9,877 | 48.91% | 6 | 0.03% | 3,665 |
| 1860 | 4 | 55 | 1,229 | 37,716 | 18,896 | 50.10% | 18,815 | 49.89% | 5 | 0.01% | 0 |
| 1870 | 4 | 55 | 3,248 | 33,384 | 16,817 | 50.37% | 16,562 | 49.61% | 5 | 0.01% | 13,224 |
| 1880 | 4 | 55 | 4,333 | 42,548 | 21,106 | 49.61% | 21,441 | 50.39% | 1 | 0.00% | 693 |
| 1890 | 4 | 55 | 5,558 | 12,572 | 6,297 | 50.09% | 6,271 | 49.88% | 4 | 0.03% | 1,011 |
| 1901 | 4 | 55 | 24,037 | 45,914 | 22,715 | 49.47% | 23,158 | 50.44% | 41 | 0.09% | 3,681 |
| 1906 | 4 | 55 | 6,877 | 47,755 | 23,497 | 49.20% | 24,258 | 50.80% | 0 | 0.00% | 432 |
| 1911 | 4 | 55 | 8,174 | 9,472 | 4,643 | 49.02% | 4,824 | 50.93% | 5 | 0.05% | 925 |
| 1916 | 4 | 56 | 9,346 | 6,328 | 3,110 | 49.15% | 3,214 | 50.79% | 4 | 0.06% | 223 |
| 1921 | 4 | 55 | 7,625 | 8,126 | 4,094 | 50.38% | 4,031 | 49.61% | 1 | 0.01% | 378 |
| 1925 | 4 | 55 | 18,229 | 1,917 | 1,014 | 52.90% | 902 | 47.05% | 1 | 0.05% | 1 |
| 1930 | 4 | 55 | 15,077 | 11,328 | 5,961 | 52.62% | 5,360 | 47.32% | 7 | 0.06% | 0 |
| 1940 | 4 | 55 | 50,977 | 5,582 | 2,919 | 52.29% | 2,662 | 47.69% | 1 | 0.02% | 219 |
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