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Folketællinger i Køge købstad
| 1787 | 48 | 1.366 | 648 | 47,44% | 718 | 52,56% | 0 | 0,00% | 0 |
| 1801 | 74 | 1.527 | 760 | 49,77% | 767 | 50,23% | 0 | 0,00% | 0 |
| 1834 | 81 | 930 | 480 | 51,61% | 450 | 48,39% | 0 | 0,00% | 0 |
| 1840 | 66 | 2.094 | 1.035 | 49,43% | 1.055 | 50,38% | 4 | 0,19% | 0 |
| 1845 | 84 | 2.250 | 1.138 | 50,58% | 1.112 | 49,42% | 0 | 0,00% | 0 |
| 1850 | 100 | 2.435 | 1.209 | 49,65% | 1.220 | 50,10% | 6 | 0,25% | 0 |
| 1855 | 140 | 2.659 | 1.377 | 51,79% | 1.282 | 48,21% | 0 | 0,00% | 0 |
| 1860 | 257 | 2.734 | 1.414 | 51,72% | 1.320 | 48,28% | 0 | 0,00% | 0 |
| 1870 | 552 | 3.116 | 1.580 | 50,71% | 1.536 | 49,29% | 0 | 0,00% | 2.084 |
| 1880 | 607 | 3.437 | 1.708 | 49,69% | 1.729 | 50,31% | 0 | 0,00% | 3.419 |
| 1890 | 899 | 3.551 | 1.706 | 48,04% | 1.844 | 51,93% | 1 | 0,03% | 3.541 |
| 1901 | 1.160 | 4.310 | 2.170 | 50,35% | 2.120 | 49,19% | 20 | 0,46% | 4.000 |
| 1906 | 1.200 | 4.352 | 2.041 | 46,90% | 2.311 | 53,10% | 0 | 0,00% | 0 |
| 1911 | 1.401 | 4.495 | 2.116 | 47,07% | 2.378 | 52,90% | 1 | 0,02% | 4.464 |
| 1916 | 1.526 | 4.698 | 2.109 | 44,89% | 2.582 | 54,96% | 7 | 0,15% | 4.674 |
| 1921 | 1.275 | 5.867 | 2.935 | 50,03% | 2.931 | 49,96% | 1 | 0,02% | 5.008 |
| 1925 | 2.031 | 0 | 0 | 0,00% | 0 | 0,00% | 0 | 0,00% | |
| 1930 | 3.573 | 2 | 1 | 50,00% | 1 | 50,00% | 0 | 0,00% | |
| 1940 | 5.832 | 10 | 5 | 50,00% | 5 | 50,00% | 0 | 0,00% | 0 |
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