Folketællinger i Frederiksborg amt 1921
Herred liste
| 1921 | Holbo | 13 | 30,77% | 1.263 | 2.635 | 1.313 | 49,83% | 1.322 | 50,17% | 0 | 0,00% | 2.167 |
| 1921 | Horns | 9 | 22,22% | 611 | 969 | 506 | 52,22% | 461 | 47,57% | 2 | 0,21% | 696 |
| 1921 | Lynge-Frederiksborg | 17 | 17,65% | 3.296 | 1.002 | 511 | 51,00% | 491 | 49,00% | 0 | 0,00% | 0 |
| 1921 | Lynge-Kronborg | 12 | 33,33% | 5.607 | 25 | 14 | 56,00% | 8 | 32,00% | 3 | 12,00% | 0 |
| 1921 | Strø | 11 | 27,27% | 1.517 | 158 | 77 | 48,73% | 79 | 50,00% | 2 | 1,27% | 0 |
| 1921 | Ølstykke | 7 | 100,00% | 527 | 6.239 | 3.195 | 51,21% | 3.044 | 48,79% | 0 | 0,00% | 0 |