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Folketællinger i Sundby sogn
| 1880 | 0 | 0 | 0 | 0,00% | 0 | 0,00% | 0 | 0,00% | |
| 1885 | 1.093 | 8.389 | 4.117 | 49,08% | 4.268 | 50,88% | 4 | 0,05% | 7.495 |
| 1890 | 27 | 294 | 146 | 49,66% | 126 | 42,86% | 22 | 7,48% | 0 |
| 1895 | 1.931 | 9.497 | 4.511 | 47,50% | 4.501 | 47,39% | 485 | 5,11% | |
| 1901 | 3.348 | 16.815 | 8.283 | 49,26% | 8.529 | 50,72% | 3 | 0,02% | 145 |
| 1906 | 5.293 | 100 | 52 | 52,00% | 48 | 48,00% | 0 | 0,00% | 0 |
| 1911 | 6.174 | 79 | 37 | 46,84% | 34 | 43,04% | 8 | 10,13% | 0 |
| 1916 | 13.948 | 40 | 9 | 22,50% | 31 | 77,50% | 0 | 0,00% | 0 |
| 1921 | 6.335 | 137 | 54 | 39,42% | 73 | 53,28% | 10 | 7,30% | 0 |
| 1925 | 36.756 | 71 | 35 | 49,30% | 29 | 40,85% | 7 | 9,86% | 0 |
| 1930 | 35.969 | 966 | 481 | 49,79% | 484 | 50,10% | 1 | 0,10% | 501 |
| 1940 | 48.017 | 115 | 53 | 46,09% | 62 | 53,91% | 0 | 0,00% | 0 |
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