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Census data for Skast Herred
| 1787 | 20 | 119 | 7,633 | 3,691 | 48.36% | 3,941 | 51.63% | 1 | 0.01% | 0 |
| 1801 | 20 | 297 | 8,491 | 4,069 | 47.92% | 4,420 | 52.06% | 2 | 0.02% | 18 |
| 1834 | 20 | 302 | 9,863 | 4,838 | 49.05% | 5,025 | 50.95% | 0 | 0.00% | 86 |
| 1840 | 20 | 379 | 10,105 | 4,969 | 49.17% | 5,135 | 50.82% | 1 | 0.01% | 755 |
| 1845 | 20 | 414 | 10,508 | 5,138 | 48.90% | 5,369 | 51.09% | 1 | 0.01% | 315 |
| 1850 | 20 | 322 | 10,955 | 5,320 | 48.56% | 5,624 | 51.34% | 11 | 0.10% | 0 |
| 1855 | 20 | 473 | 11,189 | 531 | 4.75% | 559 | 5.00% | 10,099 | 90.26% | 442 |
| 1860 | 20 | 280 | 11,945 | 5,919 | 49.55% | 6,023 | 50.42% | 3 | 0.03% | 0 |
| 1870 | 20 | 847 | 11,536 | 5,889 | 51.05% | 5,638 | 48.87% | 9 | 0.08% | 9,909 |
| 1880 | 20 | 1,256 | 16,348 | 8,176 | 50.01% | 8,171 | 49.98% | 1 | 0.01% | 12,127 |
| 1890 | 20 | 1,445 | 18,411 | 9,202 | 49.98% | 9,202 | 49.98% | 7 | 0.04% | 9,728 |
| 1901 | 20 | 14,042 | 29,259 | 14,474 | 49.47% | 14,764 | 50.46% | 21 | 0.07% | 27,909 |
| 1906 | 20 | 5,125 | 1,823 | 936 | 51.34% | 876 | 48.05% | 11 | 0.60% | 0 |
| 1911 | 20 | 6,399 | 1,180 | 597 | 50.59% | 579 | 49.07% | 4 | 0.34% | 1,140 |
| 1916 | 20 | 5,604 | 5 | 5 | 100.00% | 0 | 0.00% | 0 | 0.00% | 5 |
| 1921 | 20 | 5,762 | 1,279 | 667 | 52.15% | 609 | 47.62% | 3 | 0.23% | 1,099 |
| 1925 | 20 | 9,239 | 6,381 | 3,238 | 50.74% | 3,098 | 48.55% | 45 | 0.71% | 6,080 |
| 1930 | 20 | 17,169 | 5,088 | 2,490 | 48.94% | 2,598 | 51.06% | 0 | 0.00% | 5,017 |
| 1940 | 20 | 32,716 | 21,419 | 10,777 | 50.32% | 10,640 | 49.68% | 2 | 0.01% | 755 |
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