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Census data for Ølstykke Herred
| 1787 | 7 | 97 | 3,011 | 1,510 | 50.15% | 1,501 | 49.85% | 0 | 0.00% | 0 |
| 1801 | 7 | 130 | 3,485 | 1,780 | 51.08% | 1,703 | 48.87% | 2 | 0.06% | 0 |
| 1834 | 7 | 132 | 4,473 | 2,249 | 50.28% | 2,224 | 49.72% | 0 | 0.00% | 39 |
| 1840 | 7 | 148 | 4,990 | 2,506 | 50.22% | 2,483 | 49.76% | 1 | 0.02% | 31 |
| 1845 | 7 | 175 | 5,372 | 2,714 | 50.52% | 2,658 | 49.48% | 0 | 0.00% | 0 |
| 1850 | 7 | 165 | 5,523 | 2,764 | 50.05% | 2,759 | 49.95% | 0 | 0.00% | 0 |
| 1855 | 7 | 214 | 5,681 | 2,821 | 49.66% | 2,860 | 50.34% | 0 | 0.00% | 0 |
| 1860 | 7 | 119 | 5,840 | 2,912 | 49.86% | 2,927 | 50.12% | 1 | 0.02% | 0 |
| 1870 | 7 | 312 | 5,968 | 3,001 | 50.28% | 2,966 | 49.70% | 1 | 0.02% | 491 |
| 1880 | 7 | 459 | 5,967 | 3,002 | 50.31% | 2,965 | 49.69% | 0 | 0.00% | 0 |
| 1890 | 7 | 481 | 5,684 | 2,835 | 49.88% | 2,849 | 50.12% | 0 | 0.00% | 97 |
| 1901 | 7 | 3,619 | 5,487 | 2,764 | 50.37% | 2,722 | 49.61% | 1 | 0.02% | 5,356 |
| 1906 | 7 | 488 | 5,776 | 2,959 | 51.23% | 2,811 | 48.67% | 6 | 0.10% | 0 |
| 1911 | 7 | 536 | 5,659 | 2,830 | 50.01% | 2,829 | 49.99% | 0 | 0.00% | 5,581 |
| 1916 | 7 | 558 | 5,870 | 2,918 | 49.71% | 2,950 | 50.26% | 2 | 0.03% | 4,338 |
| 1921 | 7 | 527 | 6,240 | 3,195 | 51.20% | 3,045 | 48.80% | 0 | 0.00% | 2,292 |
| 1925 | 7 | 856 | 6,005 | 3,098 | 51.59% | 2,905 | 48.38% | 2 | 0.03% | 5,878 |
| 1930 | 7 | 550 | 6,609 | 3,461 | 52.37% | 3,144 | 47.57% | 4 | 0.06% | 6,128 |
| 1940 | 7 | 5,679 | 0 | 0 | 0.00% | 0 | 0.00% | 0 | 0.00% | |
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