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Folketællinger i Alrø sogn
| 1787 | 9 | 226 | 115 | 50,88% | 111 | 49,12% | 0 | 0,00% | 0 |
| 1801 | 9 | 212 | 106 | 50,00% | 106 | 50,00% | 0 | 0,00% | 0 |
| 1834 | 11 | 273 | 143 | 52,38% | 130 | 47,62% | 0 | 0,00% | 0 |
| 1840 | 9 | 287 | 150 | 52,26% | 137 | 47,74% | 0 | 0,00% | 0 |
| 1845 | 14 | 298 | 156 | 52,35% | 142 | 47,65% | 0 | 0,00% | 0 |
| 1850 | 7 | 291 | 148 | 50,86% | 143 | 49,14% | 0 | 0,00% | 0 |
| 1855 | 8 | 0 | 0 | 0,00% | 0 | 0,00% | 0 | 0,00% | |
| 1860 | 9 | 289 | 151 | 52,25% | 138 | 47,75% | 0 | 0,00% | 0 |
| 1870 | 14 | 249 | 133 | 53,41% | 116 | 46,59% | 0 | 0,00% | 249 |
| 1880 | 21 | 270 | 142 | 52,59% | 128 | 47,41% | 0 | 0,00% | 0 |
| 1890 | 28 | 0 | 0 | 0,00% | 0 | 0,00% | 0 | 0,00% | |
| 1901 | 203 | 277 | 145 | 52,35% | 132 | 47,65% | 0 | 0,00% | 277 |
| 1906 | 23 | 283 | 143 | 50,53% | 139 | 49,12% | 1 | 0,35% | 0 |
| 1911 | 33 | 0 | 0 | 0,00% | 0 | 0,00% | 0 | 0,00% | |
| 1916 | 33 | 0 | 0 | 0,00% | 0 | 0,00% | 0 | 0,00% | |
| 1921 | 28 | 0 | 0 | 0,00% | 0 | 0,00% | 0 | 0,00% | |
| 1925 | 29 | 0 | 0 | 0,00% | 0 | 0,00% | 0 | 0,00% | |
| 1930 | 26 | 0 | 0 | 0,00% | 0 | 0,00% | 0 | 0,00% | |
| 1940 | 154 | 0 | 0 | 0,00% | 0 | 0,00% | 0 | 0,00% | |
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