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Census data for Svendborg købstad
| 1787 | 46 | 2,025 | 973 | 48.05% | 1,052 | 51.95% | 0 | 0.00% | 0 |
| 1801 | 49 | 1,942 | 914 | 47.06% | 1,028 | 52.94% | 0 | 0.00% | 1 |
| 1834 | 132 | 3,360 | 1,605 | 47.77% | 1,755 | 52.23% | 0 | 0.00% | 0 |
| 1840 | 105 | 3,577 | 1,710 | 47.81% | 1,867 | 52.19% | 0 | 0.00% | 0 |
| 1845 | 119 | 3,918 | 1,869 | 47.70% | 2,044 | 52.17% | 5 | 0.13% | 0 |
| 1850 | 157 | 4,556 | 2,142 | 47.01% | 2,399 | 52.66% | 15 | 0.33% | 0 |
| 1855 | 1,780 | 5,275 | 2,631 | 49.88% | 2,632 | 49.90% | 12 | 0.23% | 4,924 |
| 1860 | 233 | 5,544 | 2,738 | 49.39% | 2,799 | 50.49% | 7 | 0.13% | 0 |
| 1870 | 1,004 | 0 | 0 | 0.00% | 0 | 0.00% | 0 | 0.00% | |
| 1880 | 1,815 | 7,350 | 3,630 | 49.39% | 3,720 | 50.61% | 0 | 0.00% | 1 |
| 1890 | 3,053 | 8,755 | 4,191 | 47.87% | 4,564 | 52.13% | 0 | 0.00% | 0 |
| 1901 | 4,310 | 11,755 | 5,528 | 47.03% | 6,204 | 52.78% | 23 | 0.20% | 11,080 |
| 1906 | 4,329 | 65 | 43 | 66.15% | 22 | 33.85% | 0 | 0.00% | 0 |
| 1911 | 5,018 | 3 | 2 | 66.67% | 1 | 33.33% | 0 | 0.00% | |
| 1916 | 5,398 | 26 | 2 | 7.69% | 1 | 3.85% | 23 | 88.46% | 0 |
| 1921 | 4,116 | 5 | 0 | 0.00% | 0 | 0.00% | 5 | 100.00% | |
| 1925 | 8,436 | 4 | 0 | 0.00% | 0 | 0.00% | 4 | 100.00% | |
| 1930 | 8,548 | 15,129 | 7,069 | 46.72% | 7,869 | 52.01% | 191 | 1.26% | 14,161 |
| 1940 | 13,921 | 124 | 66 | 53.23% | 54 | 43.55% | 4 | 3.23% | 0 |
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