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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 | 3,367 | 50.31% | 3,325 | 49.69% | 0 | 0.00% | 0 |
| 1834 | 11 | 246 | 8,981 | 4,566 | 50.84% | 4,415 | 49.16% | 0 | 0.00% | 110 |
| 1840 | 11 | 249 | 9,543 | 4,842 | 50.74% | 4,701 | 49.26% | 0 | 0.00% | 0 |
| 1845 | 11 | 309 | 9,766 | 4,886 | 50.03% | 4,880 | 49.97% | 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 | 5,045 | 49.87% | 5,070 | 50.11% | 2 | 0.02% | 0 |
| 1870 | 11 | 712 | 10,905 | 5,427 | 49.77% | 5,478 | 50.23% | 0 | 0.00% | 6,977 |
| 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 | 10,728 | 5,374 | 50.09% | 5,354 | 49.91% | 0 | 0.00% | 1,835 |
| 1906 | 11 | 1,425 | 11,059 | 5,582 | 50.47% | 5,477 | 49.53% | 0 | 0.00% | 0 |
| 1911 | 11 | 1,786 | 890 | 426 | 47.87% | 461 | 51.80% | 3 | 0.34% | 812 |
| 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 | 2,685 | 1,444 | 53.78% | 1,241 | 46.22% | 0 | 0.00% | 0 |
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