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Census data for Frederiksborg County
| 1769 | 6 | 1 | 0 | 1,266 | 609 | 48.10% | 657 | 51.90% | 0 | 0.00% | 1,266 |
| 1787 | 6 | 66 | 1,363 | 41,867 | 21,163 | 50.55% | 20,702 | 49.45% | 2 | 0.00% | 0 |
| 1801 | 6 | 68 | 1,790 | 47,297 | 23,977 | 50.69% | 23,299 | 49.26% | 21 | 0.04% | 0 |
| 1834 | 6 | 68 | 1,935 | 66,949 | 33,686 | 50.32% | 33,259 | 49.68% | 4 | 0.01% | 335 |
| 1840 | 6 | 69 | 1,906 | 70,013 | 35,283 | 50.39% | 34,719 | 49.59% | 11 | 0.02% | 59 |
| 1845 | 6 | 69 | 2,338 | 73,587 | 36,076 | 49.02% | 37,481 | 50.93% | 30 | 0.04% | 606 |
| 1850 | 6 | 69 | 2,399 | 74,939 | 36,715 | 48.99% | 38,173 | 50.94% | 51 | 0.07% | 196 |
| 1855 | 6 | 69 | 3,338 | 30,257 | 14,877 | 49.17% | 15,356 | 50.75% | 24 | 0.08% | 1,991 |
| 1860 | 6 | 69 | 1,852 | 79,442 | 39,432 | 49.64% | 39,996 | 50.35% | 14 | 0.02% | 0 |
| 1870 | 6 | 69 | 5,910 | 76,368 | 37,723 | 49.40% | 38,619 | 50.57% | 26 | 0.03% | 54,541 |
| 1880 | 6 | 69 | 7,914 | 83,018 | 41,093 | 49.50% | 41,902 | 50.47% | 23 | 0.03% | 5,347 |
| 1890 | 6 | 69 | 9,605 | 85,079 | 41,952 | 49.31% | 43,126 | 50.69% | 1 | 0.00% | 6,193 |
| 1901 | 6 | 69 | 46,915 | 90,661 | 44,762 | 49.37% | 45,895 | 50.62% | 4 | 0.00% | 67,940 |
| 1906 | 6 | 69 | 12,157 | 29,070 | 14,642 | 50.37% | 14,423 | 49.61% | 5 | 0.02% | 0 |
| 1911 | 6 | 69 | 14,457 | 10,977 | 5,461 | 49.75% | 5,494 | 50.05% | 22 | 0.20% | 9,300 |
| 1916 | 6 | 69 | 15,418 | 17,015 | 8,604 | 50.57% | 8,409 | 49.42% | 2 | 0.01% | 7,912 |
| 1921 | 6 | 69 | 12,821 | 11,104 | 5,652 | 50.90% | 5,435 | 48.95% | 17 | 0.15% | 5,748 |
| 1925 | 6 | 69 | 20,651 | 10,953 | 5,617 | 51.28% | 5,278 | 48.19% | 58 | 0.53% | 10,009 |
| 1930 | 6 | 69 | 24,093 | 31,097 | 15,718 | 50.55% | 15,365 | 49.41% | 14 | 0.05% | 22,365 |
| 1940 | 6 | 69 | 101,405 | 8,304 | 4,380 | 52.75% | 3,919 | 47.19% | 5 | 0.06% | 0 |
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