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Census data for København County
| 1787 | 4 | 98 | 7,047 | 111,955 | 57,073 | 50.98% | 54,829 | 48.97% | 53 | 0.05% | 0 |
| 1801 | 4 | 99 | 6,191 | 125,018 | 64,088 | 51.26% | 60,761 | 48.60% | 169 | 0.14% | 144 |
| 1834 | 4 | 98 | 3,193 | 60,957 | 29,558 | 48.49% | 31,391 | 51.50% | 8 | 0.01% | 56 |
| 1835 | 4 | 98 | 0 | 1 | 1 | 100.00% | 0 | 0.00% | 0 | 0.00% | |
| 1840 | 4 | 99 | 11,546 | 156,958 | 79,801 | 50.84% | 76,599 | 48.80% | 558 | 0.36% | 4,156 |
| 1845 | 4 | 99 | 8,345 | 162,522 | 78,632 | 48.38% | 83,521 | 51.39% | 369 | 0.23% | 8,929 |
| 1846 | 4 | 99 | 0 | 1 | 1 | 100.00% | 0 | 0.00% | 0 | 0.00% | |
| 1850 | 4 | 101 | 11,018 | 168,384 | 80,060 | 47.55% | 87,902 | 52.20% | 422 | 0.25% | 7,273 |
| 1855 | 4 | 101 | 19,112 | 52,143 | 25,709 | 49.30% | 26,283 | 50.41% | 151 | 0.29% | 17,481 |
| 1860 | 4 | 101 | 9,273 | 175,542 | 84,609 | 48.20% | 90,231 | 51.40% | 702 | 0.40% | 61,632 |
| 1864 | 4 | 101 | 0 | 2 | 2 | 100.00% | 0 | 0.00% | 0 | 0.00% | |
| 1870 | 4 | 101 | 19,409 | 15,240 | 7,846 | 51.48% | 7,295 | 47.87% | 99 | 0.65% | 12,708 |
| 1880 | 4 | 119 | 33,840 | 312,004 | 147,184 | 47.17% | 164,685 | 52.78% | 135 | 0.04% | 191,479 |
| 1885 | 4 | 119 | 28,521 | 325,881 | 150,909 | 46.31% | 174,854 | 53.66% | 118 | 0.04% | 239,248 |
| 1890 | 4 | 119 | 48,599 | 126,389 | 58,480 | 46.27% | 59,288 | 46.91% | 8,621 | 6.82% | 15,856 |
| 1895 | 4 | 119 | 40,185 | 31,957 | 15,074 | 47.17% | 15,426 | 48.27% | 1,457 | 4.56% | |
| 1901 | 4 | 120 | 87,604 | 295,581 | 137,291 | 46.45% | 157,086 | 53.14% | 1,204 | 0.41% | 283,571 |
| 1906 | 4 | 120 | 90,608 | 40,199 | 19,652 | 48.89% | 20,475 | 50.93% | 72 | 0.18% | 0 |
| 1911 | 4 | 120 | 101,453 | 13,205 | 6,491 | 49.16% | 6,499 | 49.22% | 215 | 1.63% | 9,685 |
| 1916 | 4 | 120 | 208,532 | 24,319 | 12,822 | 52.72% | 11,290 | 46.42% | 207 | 0.85% | 5,897 |
| 1921 | 4 | 120 | 98,377 | 54,916 | 26,288 | 47.87% | 28,452 | 51.81% | 176 | 0.32% | 46,881 |
| 1925 | 4 | 120 | 471,084 | 54,304 | 22,646 | 41.70% | 29,647 | 54.59% | 2,011 | 3.70% | 47,713 |
| 1930 | 4 | 120 | 503,970 | 38,191 | 17,838 | 46.71% | 20,298 | 53.15% | 55 | 0.14% | 34,064 |
| 1940 | 4 | 120 | 967,388 | 16,413 | 7,800 | 47.52% | 8,460 | 51.54% | 153 | 0.93% | 5 |
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