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Census data for Holbæk Købstad
| 1787 | 42 | 1,199 | 576 | 48.04% | 623 | 51.96% | 0 | 0.00% | 0 |
| 1801 | 59 | 1,332 | 677 | 50.83% | 655 | 49.17% | 0 | 0.00% | 0 |
| 1834 | 62 | 2,007 | 1,034 | 51.52% | 973 | 48.48% | 0 | 0.00% | 0 |
| 1840 | 65 | 2,110 | 1,121 | 53.13% | 989 | 46.87% | 0 | 0.00% | 0 |
| 1845 | 65 | 2,351 | 1,195 | 50.83% | 1,156 | 49.17% | 0 | 0.00% | 0 |
| 1850 | 102 | 2,638 | 1,317 | 49.92% | 1,319 | 50.00% | 2 | 0.08% | 103 |
| 1855 | 122 | 635 | 318 | 50.08% | 295 | 46.46% | 22 | 3.46% | 0 |
| 1860 | 105 | 2,971 | 1,452 | 48.87% | 1,519 | 51.13% | 0 | 0.00% | 0 |
| 1870 | 484 | 7 | 5 | 71.43% | 2 | 28.57% | 0 | 0.00% | 0 |
| 1880 | 596 | 3,288 | 1,594 | 48.48% | 1,694 | 51.52% | 0 | 0.00% | 1,773 |
| 1890 | 1,066 | 0 | 0 | 0.00% | 0 | 0.00% | 0 | 0.00% | |
| 1901 | 1,295 | 4,620 | 2,188 | 47.36% | 2,432 | 52.64% | 0 | 0.00% | 4,311 |
| 1906 | 1,568 | 5,332 | 2,524 | 47.34% | 2,808 | 52.66% | 0 | 0.00% | 0 |
| 1911 | 1,785 | 21 | 10 | 47.62% | 10 | 47.62% | 1 | 4.76% | 0 |
| 1916 | 2,785 | 0 | 0 | 0.00% | 0 | 0.00% | 0 | 0.00% | |
| 1921 | 3,088 | 14 | 4 | 28.57% | 9 | 64.29% | 1 | 7.14% | 0 |
| 1925 | 4,872 | 0 | 0 | 0.00% | 0 | 0.00% | 0 | 0.00% | |
| 1930 | 8,898 | 12,968 | 6,339 | 48.88% | 6,626 | 51.10% | 3 | 0.02% | 12,542 |
| 1940 | 8,944 | 247 | 116 | 46.96% | 131 | 53.04% | 0 | 0.00% | 0 |
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