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Census data for Hjørring County
| 1717 | 7 | 1 | 21 | 0 | 0 | 0.00% | 0 | 0.00% | 0 | 0.00% | |
| 1787 | 7 | 92 | 1,659 | 40,824 | 20,172 | 49.41% | 20,645 | 50.57% | 7 | 0.02% | 0 |
| 1801 | 7 | 93 | 1,622 | 45,375 | 22,059 | 48.61% | 23,308 | 51.37% | 8 | 0.02% | 0 |
| 1834 | 7 | 94 | 1,979 | 62,169 | 30,891 | 49.69% | 31,266 | 50.29% | 12 | 0.02% | 41 |
| 1840 | 7 | 94 | 1,875 | 62,037 | 30,775 | 49.61% | 31,160 | 50.23% | 102 | 0.16% | 1,242 |
| 1845 | 7 | 94 | 2,376 | 68,513 | 32,649 | 47.65% | 34,105 | 49.78% | 1,759 | 2.57% | 649 |
| 1850 | 7 | 95 | 2,288 | 72,506 | 31,664 | 43.67% | 32,743 | 45.16% | 8,099 | 11.17% | 1,354 |
| 1855 | 7 | 95 | 3,536 | 76,001 | 22,487 | 29.59% | 29,778 | 39.18% | 23,736 | 31.23% | 0 |
| 1860 | 7 | 95 | 1,813 | 84,275 | 41,681 | 49.46% | 42,571 | 50.51% | 23 | 0.03% | 0 |
| 1864 | 7 | 95 | 0 | 1 | 0 | 0.00% | 0 | 0.00% | 1 | 100.00% | |
| 1870 | 7 | 95 | 6,556 | 92,417 | 45,932 | 49.70% | 46,483 | 50.30% | 2 | 0.00% | 8,462 |
| 1880 | 7 | 95 | 9,068 | 102,431 | 50,933 | 49.72% | 51,489 | 50.27% | 9 | 0.01% | 61,752 |
| 1890 | 7 | 95 | 12,058 | 111,279 | 55,252 | 49.65% | 56,021 | 50.34% | 6 | 0.01% | 61,727 |
| 1895 | 7 | 95 | 0 | 1 | 0 | 0.00% | 0 | 0.00% | 1 | 100.00% | |
| 1901 | 7 | 95 | 65,799 | 119,867 | 59,444 | 49.59% | 60,202 | 50.22% | 221 | 0.18% | 105,092 |
| 1906 | 7 | 95 | 16,306 | 38,487 | 19,260 | 50.04% | 19,207 | 49.91% | 20 | 0.05% | 0 |
| 1911 | 7 | 95 | 19,165 | 24,722 | 12,402 | 50.17% | 12,168 | 49.22% | 152 | 0.61% | 12,998 |
| 1916 | 7 | 95 | 20,396 | 16,887 | 8,301 | 49.16% | 8,576 | 50.78% | 10 | 0.06% | 12,293 |
| 1921 | 7 | 95 | 16,623 | 73,728 | 37,011 | 50.20% | 36,530 | 49.55% | 187 | 0.25% | 48,217 |
| 1925 | 7 | 95 | 25,341 | 4,490 | 2,192 | 48.82% | 2,069 | 46.08% | 229 | 5.10% | 3,810 |
| 1930 | 7 | 95 | 28,403 | 25,212 | 12,964 | 51.42% | 12,213 | 48.44% | 35 | 0.14% | 20,452 |
| 1940 | 7 | 95 | 83,249 | 11,669 | 6,072 | 52.04% | 5,588 | 47.89% | 9 | 0.08% | 546 |
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