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Census data for Strø Herred
| 1787 | 10 | 210 | 5,545 | 2,758 | 49.74% | 2,786 | 50.24% | 1 | 0.02% | 0 |
| 1801 | 11 | 225 | 6,692 | 3,368 | 50.33% | 3,324 | 49.67% | 0 | 0.00% | 0 |
| 1834 | 11 | 246 | 8,981 | 4,566 | 50.84% | 4,415 | 49.16% | 0 | 0.00% | 146 |
| 1840 | 11 | 249 | 9,602 | 4,874 | 50.76% | 4,728 | 49.24% | 0 | 0.00% | 59 |
| 1845 | 11 | 309 | 9,766 | 4,877 | 49.94% | 4,889 | 50.06% | 0 | 0.00% | 0 |
| 1850 | 11 | 305 | 10,054 | 5,003 | 49.76% | 5,048 | 50.21% | 3 | 0.03% | 0 |
| 1855 | 11 | 354 | 1,752 | 867 | 49.49% | 885 | 50.51% | 0 | 0.00% | 0 |
| 1860 | 11 | 219 | 10,117 | 5,041 | 49.83% | 5,070 | 50.11% | 6 | 0.06% | 0 |
| 1870 | 11 | 712 | 9,990 | 4,992 | 49.97% | 4,998 | 50.03% | 0 | 0.00% | 6,062 |
| 1880 | 11 | 924 | 10,412 | 5,176 | 49.71% | 5,236 | 50.29% | 0 | 0.00% | 0 |
| 1890 | 11 | 998 | 10,391 | 5,147 | 49.53% | 5,244 | 50.47% | 0 | 0.00% | 0 |
| 1901 | 11 | 6,554 | 10,729 | 5,375 | 50.10% | 5,354 | 49.90% | 0 | 0.00% | 2,205 |
| 1906 | 11 | 1,425 | 11,059 | 5,582 | 50.47% | 5,477 | 49.53% | 0 | 0.00% | 0 |
| 1911 | 11 | 1,786 | 78 | 40 | 51.28% | 35 | 44.87% | 3 | 3.85% | 0 |
| 1916 | 11 | 1,766 | 2,260 | 1,181 | 52.26% | 1,079 | 47.74% | 0 | 0.00% | 0 |
| 1921 | 11 | 1,517 | 162 | 79 | 48.77% | 81 | 50.00% | 2 | 1.23% | 0 |
| 1925 | 11 | 2,074 | 757 | 406 | 53.63% | 348 | 45.97% | 3 | 0.40% | 0 |
| 1930 | 11 | 2,105 | 1,766 | 926 | 52.43% | 839 | 47.51% | 1 | 0.06% | 0 |
| 1940 | 11 | 11,368 | 2,651 | 1,420 | 53.56% | 1,230 | 46.40% | 1 | 0.04% | 0 |
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