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Census data for Århus County
| 1787 | 6 | 63 | 722 | 23,784 | 11,811 | 49.66% | 11,972 | 50.34% | 1 | 0.00% | 0 |
| 1801 | 6 | 63 | 1,023 | 25,165 | 12,540 | 49.83% | 12,622 | 50.16% | 3 | 0.01% | 0 |
| 1834 | 6 | 63 | 1,260 | 36,487 | 18,300 | 50.15% | 18,175 | 49.81% | 12 | 0.03% | 209 |
| 1840 | 6 | 63 | 1,179 | 38,387 | 19,205 | 50.03% | 19,171 | 49.94% | 11 | 0.03% | 0 |
| 1845 | 6 | 63 | 1,547 | 40,149 | 20,189 | 50.29% | 19,937 | 49.66% | 23 | 0.06% | 0 |
| 1850 | 6 | 63 | 1,423 | 41,132 | 20,631 | 50.16% | 20,487 | 49.81% | 14 | 0.03% | 557 |
| 1855 | 6 | 63 | 5,445 | 5,714 | 2,878 | 50.37% | 2,805 | 49.09% | 31 | 0.54% | 2,569 |
| 1860 | 6 | 63 | 2,170 | 48,437 | 24,527 | 50.64% | 23,907 | 49.36% | 3 | 0.01% | 35 |
| 1870 | 6 | 63 | 4,804 | 8,334 | 4,226 | 50.71% | 4,101 | 49.21% | 7 | 0.08% | 0 |
| 1880 | 6 | 63 | 7,456 | 68,314 | 34,106 | 49.93% | 34,200 | 50.06% | 8 | 0.01% | 1,474 |
| 1890 | 6 | 63 | 11,542 | 16,400 | 8,177 | 49.86% | 8,208 | 50.05% | 15 | 0.09% | 4,964 |
| 1895 | 6 | 63 | 0 | 1 | 0 | 0.00% | 0 | 0.00% | 1 | 100.00% | |
| 1901 | 6 | 63 | 39,771 | 99,041 | 48,911 | 49.38% | 50,030 | 50.51% | 100 | 0.10% | 45,100 |
| 1906 | 6 | 63 | 16,812 | 38,724 | 18,667 | 48.21% | 20,041 | 51.75% | 16 | 0.04% | 838 |
| 1911 | 6 | 63 | 19,989 | 2,873 | 1,415 | 49.25% | 1,456 | 50.68% | 2 | 0.07% | 2,776 |
| 1916 | 6 | 63 | 20,975 | 11,705 | 5,701 | 48.71% | 5,994 | 51.21% | 10 | 0.09% | 6,339 |
| 1921 | 6 | 63 | 16,426 | 4,966 | 2,403 | 48.39% | 2,285 | 46.01% | 278 | 5.60% | 3,000 |
| 1925 | 6 | 63 | 28,510 | 1,067 | 535 | 50.14% | 486 | 45.55% | 46 | 4.31% | 0 |
| 1930 | 6 | 63 | 60,154 | 10,436 | 5,343 | 51.20% | 5,016 | 48.06% | 77 | 0.74% | 8,304 |
| 1940 | 6 | 63 | 107,564 | 453 | 222 | 49.01% | 225 | 49.67% | 6 | 1.32% | 0 |
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