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Census data for Ølstykke Herred
| 1787 | 7 | 97 | 3,011 | 1,511 | 50.18% | 1,500 | 49.82% | 0 | 0.00% | 0 |
| 1801 | 7 | 130 | 3,485 | 1,778 | 51.02% | 1,705 | 48.92% | 2 | 0.06% | 0 |
| 1834 | 7 | 132 | 4,656 | 2,345 | 50.37% | 2,311 | 49.63% | 0 | 0.00% | 39 |
| 1840 | 7 | 149 | 4,990 | 2,509 | 50.28% | 2,480 | 49.70% | 1 | 0.02% | 0 |
| 1845 | 7 | 175 | 5,372 | 2,717 | 50.58% | 2,655 | 49.42% | 0 | 0.00% | 0 |
| 1850 | 7 | 165 | 5,523 | 2,754 | 49.86% | 2,769 | 50.14% | 0 | 0.00% | 0 |
| 1855 | 7 | 214 | 5,681 | 2,824 | 49.71% | 2,857 | 50.29% | 0 | 0.00% | 0 |
| 1860 | 7 | 119 | 5,840 | 2,909 | 49.81% | 2,930 | 50.17% | 1 | 0.02% | 0 |
| 1870 | 7 | 312 | 5,968 | 2,994 | 50.17% | 2,974 | 49.83% | 0 | 0.00% | 491 |
| 1880 | 7 | 459 | 5,987 | 3,011 | 50.29% | 2,976 | 49.71% | 0 | 0.00% | 20 |
| 1890 | 7 | 481 | 5,684 | 2,837 | 49.91% | 2,847 | 50.09% | 0 | 0.00% | 97 |
| 1901 | 7 | 3,619 | 5,486 | 2,753 | 50.18% | 2,732 | 49.80% | 1 | 0.02% | 5,152 |
| 1906 | 7 | 488 | 5,776 | 2,941 | 50.92% | 2,832 | 49.03% | 3 | 0.05% | 0 |
| 1911 | 7 | 536 | 5,825 | 2,917 | 50.08% | 2,908 | 49.92% | 0 | 0.00% | 5,617 |
| 1916 | 7 | 558 | 5,862 | 2,904 | 49.54% | 2,957 | 50.44% | 1 | 0.02% | 4,167 |
| 1921 | 7 | 527 | 6,239 | 3,199 | 51.27% | 3,040 | 48.73% | 0 | 0.00% | 2,245 |
| 1925 | 7 | 739 | 6,007 | 3,101 | 51.62% | 2,905 | 48.36% | 1 | 0.02% | 5,777 |
| 1930 | 7 | 550 | 6,607 | 3,463 | 52.41% | 3,143 | 47.57% | 1 | 0.02% | 4,697 |
| 1940 | 7 | 5,679 | 0 | 0 | 0.00% | 0 | 0.00% | 0 | 0.00% | |
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