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Folketællinger i Ølby sogn
| 1787 | 5 | 208 | 97 | 46,63% | 111 | 53,37% | 0 | 0,00% | 0 |
| 1801 | 6 | 192 | 94 | 48,96% | 98 | 51,04% | 0 | 0,00% | 0 |
| 1834 | 7 | 193 | 91 | 47,15% | 102 | 52,85% | 0 | 0,00% | 0 |
| 1840 | 7 | 186 | 92 | 49,46% | 94 | 50,54% | 0 | 0,00% | 0 |
| 1845 | 11 | 175 | 86 | 49,14% | 89 | 50,86% | 0 | 0,00% | 0 |
| 1850 | 7 | 184 | 92 | 50,00% | 92 | 50,00% | 0 | 0,00% | 0 |
| 1855 | 12 | 206 | 95 | 46,12% | 111 | 53,88% | 0 | 0,00% | 0 |
| 1860 | 7 | 229 | 107 | 46,72% | 122 | 53,28% | 0 | 0,00% | 0 |
| 1870 | 20 | 299 | 149 | 49,83% | 150 | 50,17% | 0 | 0,00% | 0 |
| 1880 | 29 | 334 | 160 | 47,90% | 174 | 52,10% | 0 | 0,00% | 0 |
| 1890 | 30 | 9 | 6 | 66,67% | 3 | 33,33% | 0 | 0,00% | 0 |
| 1901 | 265 | 398 | 204 | 51,26% | 193 | 48,49% | 1 | 0,25% | 398 |
| 1906 | 33 | 456 | 233 | 51,10% | 223 | 48,90% | 0 | 0,00% | 0 |
| 1911 | 50 | 0 | 0 | 0,00% | 0 | 0,00% | 0 | 0,00% | |
| 1916 | 51 | 0 | 0 | 0,00% | 0 | 0,00% | 0 | 0,00% | |
| 1921 | 37 | 0 | 0 | 0,00% | 0 | 0,00% | 0 | 0,00% | |
| 1925 | 42 | 3 | 1 | 33,33% | 2 | 66,67% | 0 | 0,00% | 0 |
| 1930 | 38 | 453 | 236 | 52,10% | 217 | 47,90% | 0 | 0,00% | 0 |
| 1940 | 212 | 0 | 0 | 0,00% | 0 | 0,00% | 0 | 0,00% | |
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