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Folketællinger i Undløse sogn
| 1787 | 23 | 758 | 354 | 46,70% | 404 | 53,30% | 0 | 0,00% | 0 |
| 1801 | 27 | 821 | 403 | 49,09% | 418 | 50,91% | 0 | 0,00% | 0 |
| 1834 | 25 | 978 | 463 | 47,34% | 515 | 52,66% | 0 | 0,00% | 0 |
| 1840 | 33 | 1.105 | 541 | 48,96% | 564 | 51,04% | 0 | 0,00% | 0 |
| 1845 | 40 | 1.190 | 599 | 50,34% | 591 | 49,66% | 0 | 0,00% | 0 |
| 1850 | 39 | 1.257 | 619 | 49,24% | 638 | 50,76% | 0 | 0,00% | 0 |
| 1855 | 56 | 1.281 | 619 | 48,32% | 662 | 51,68% | 0 | 0,00% | 1.281 |
| 1860 | 30 | 1.334 | 651 | 48,80% | 683 | 51,20% | 0 | 0,00% | 0 |
| 1870 | 75 | 1.323 | 645 | 48,75% | 678 | 51,25% | 0 | 0,00% | 1.322 |
| 1880 | 91 | 1.335 | 643 | 48,16% | 692 | 51,84% | 0 | 0,00% | 1.209 |
| 1890 | 100 | 114 | 51 | 44,74% | 63 | 55,26% | 0 | 0,00% | 0 |
| 1901 | 795 | 1.318 | 658 | 49,92% | 660 | 50,08% | 0 | 0,00% | 0 |
| 1906 | 98 | 1.273 | 630 | 49,49% | 643 | 50,51% | 0 | 0,00% | 0 |
| 1911 | 112 | 25 | 15 | 60,00% | 10 | 40,00% | 0 | 0,00% | 0 |
| 1916 | 141 | 1.489 | 821 | 55,14% | 668 | 44,86% | 0 | 0,00% | 0 |
| 1921 | 110 | 0 | 0 | 0,00% | 0 | 0,00% | 0 | 0,00% | |
| 1925 | 169 | 20 | 9 | 45,00% | 11 | 55,00% | 0 | 0,00% | 0 |
| 1930 | 107 | 1.426 | 757 | 53,09% | 669 | 46,91% | 0 | 0,00% | 0 |
| 1940 | 998 | 1.327 | 721 | 54,33% | 606 | 45,67% | 0 | 0,00% | 0 |
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