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Census data for Bornholm County
| 1787 | 4 | 23 | 694 | 17,704 | 8,279 | 46.76% | 9,403 | 53.11% | 22 | 0.12% | 0 |
| 1801 | 4 | 24 | 688 | 19,516 | 9,223 | 47.26% | 10,291 | 52.73% | 2 | 0.01% | 0 |
| 1834 | 4 | 24 | 809 | 24,653 | 12,048 | 48.87% | 12,604 | 51.13% | 1 | 0.00% | 52 |
| 1840 | 4 | 24 | 743 | 24,333 | 11,871 | 48.79% | 12,458 | 51.20% | 4 | 0.02% | 19 |
| 1845 | 4 | 24 | 728 | 26,579 | 12,731 | 47.90% | 13,833 | 52.04% | 15 | 0.06% | 0 |
| 1850 | 4 | 24 | 802 | 28,592 | 13,822 | 48.34% | 14,751 | 51.59% | 19 | 0.07% | 798 |
| 1855 | 4 | 24 | 1,130 | 28,954 | 14,008 | 48.38% | 14,945 | 51.62% | 1 | 0.00% | 29 |
| 1860 | 4 | 24 | 636 | 29,300 | 14,071 | 48.02% | 15,229 | 51.98% | 0 | 0.00% | 3,247 |
| 1870 | 4 | 24 | 2,242 | 31,549 | 15,078 | 47.79% | 16,469 | 52.20% | 2 | 0.01% | 0 |
| 1880 | 4 | 24 | 3,448 | 35,685 | 17,325 | 48.55% | 18,360 | 51.45% | 0 | 0.00% | 0 |
| 1890 | 4 | 24 | 4,571 | 39,058 | 18,825 | 48.20% | 20,233 | 51.80% | 0 | 0.00% | 7 |
| 1901 | 4 | 24 | 27,759 | 41,224 | 20,036 | 48.60% | 21,133 | 51.26% | 55 | 0.13% | 34,565 |
| 1906 | 4 | 24 | 14,668 | 12,821 | 6,406 | 49.96% | 6,414 | 50.03% | 1 | 0.01% | 0 |
| 1911 | 4 | 24 | 16,068 | 5,386 | 2,689 | 49.93% | 2,690 | 49.94% | 7 | 0.13% | 2,285 |
| 1916 | 4 | 24 | 17,159 | 1,434 | 710 | 49.51% | 723 | 50.42% | 1 | 0.07% | 1,156 |
| 1921 | 4 | 24 | 12,863 | 37,992 | 18,522 | 48.75% | 19,465 | 51.23% | 5 | 0.01% | 13,520 |
| 1925 | 4 | 24 | 21,794 | 143 | 60 | 41.96% | 69 | 48.25% | 14 | 9.79% | 0 |
| 1930 | 4 | 24 | 13,726 | 11,698 | 6,118 | 52.30% | 5,578 | 47.68% | 2 | 0.02% | 6,756 |
| 1940 | 4 | 24 | 26,650 | 46,967 | 23,746 | 50.56% | 23,217 | 49.43% | 4 | 0.01% | 0 |
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