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Census data for Fleskum Herred
| 1787 | 17 | 381 | 9,518 | 4,686 | 49.23% | 4,798 | 50.41% | 34 | 0.36% | 0 |
| 1801 | 17 | 401 | 10,558 | 5,197 | 49.22% | 5,361 | 50.78% | 0 | 0.00% | 0 |
| 1834 | 17 | 521 | 13,675 | 6,679 | 48.84% | 6,993 | 51.14% | 3 | 0.02% | 0 |
| 1840 | 17 | 403 | 13,905 | 6,684 | 48.07% | 7,211 | 51.86% | 10 | 0.07% | 0 |
| 1845 | 17 | 529 | 14,269 | 6,997 | 49.04% | 7,268 | 50.94% | 4 | 0.03% | 38 |
| 1850 | 17 | 476 | 14,757 | 7,171 | 48.59% | 7,582 | 51.38% | 4 | 0.03% | 33 |
| 1855 | 17 | 2,903 | 16,626 | 8,220 | 49.44% | 8,308 | 49.97% | 98 | 0.59% | 0 |
| 1860 | 17 | 1,134 | 17,923 | 8,870 | 49.49% | 9,032 | 50.39% | 21 | 0.12% | 120 |
| 1870 | 17 | 2,378 | 8,882 | 4,511 | 50.79% | 4,371 | 49.21% | 0 | 0.00% | 5,354 |
| 1880 | 17 | 3,165 | 23,484 | 11,540 | 49.14% | 11,944 | 50.86% | 0 | 0.00% | 0 |
| 1890 | 17 | 5,202 | 29,202 | 14,248 | 48.79% | 14,954 | 51.21% | 0 | 0.00% | 0 |
| 1901 | 17 | 13,289 | 43,266 | 21,091 | 48.75% | 22,165 | 51.23% | 10 | 0.02% | 29,806 |
| 1906 | 17 | 7,733 | 2,139 | 1,091 | 51.01% | 1,048 | 48.99% | 0 | 0.00% | 0 |
| 1911 | 17 | 8,882 | 2,065 | 1,056 | 51.14% | 1,000 | 48.43% | 9 | 0.44% | 1,874 |
| 1916 | 17 | 10,317 | 9,734 | 4,853 | 49.86% | 4,860 | 49.93% | 21 | 0.22% | 8,504 |
| 1921 | 17 | 7,923 | 8,634 | 4,383 | 50.76% | 4,245 | 49.17% | 6 | 0.07% | 1,263 |
| 1925 | 17 | 11,477 | 169 | 71 | 42.01% | 76 | 44.97% | 22 | 13.02% | 0 |
| 1930 | 17 | 31,054 | 2,108 | 1,137 | 53.94% | 968 | 45.92% | 3 | 0.14% | 1,627 |
| 1940 | 17 | 51,704 | 2,974 | 1,599 | 53.77% | 1,373 | 46.17% | 2 | 0.07% | 0 |
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