Folketællinger i Frederiksborg amt 1921
Herred liste
| 1921 | Holbo | 13 | 46,15% | 1.263 | 2.685 | 1.331 | 49,57% | 1.345 | 50,09% | 9 | 0,34% | 2.554 |
| 1921 | Horns | 9 | 22,22% | 611 | 969 | 507 | 52,32% | 460 | 47,47% | 2 | 0,21% | 902 |
| 1921 | Lynge-Frederiksborg | 17 | 29,41% | 3.296 | 1.025 | 524 | 51,12% | 500 | 48,78% | 1 | 0,10% | 0 |
| 1921 | Lynge-Kronborg | 12 | 41,67% | 5.607 | 23 | 12 | 52,17% | 8 | 34,78% | 3 | 13,04% | 0 |
| 1921 | Strø | 11 | 36,36% | 1.517 | 131 | 62 | 47,33% | 67 | 51,15% | 2 | 1,53% | 0 |
| 1921 | Ølstykke | 7 | 100,00% | 527 | 6.240 | 3.199 | 51,27% | 3.041 | 48,73% | 0 | 0,00% | 2.292 |