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Census data for 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% | 4,040 |
| 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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