According to the 2011 census of India, Nzau Namsan has 252 households. The effective literacy rate (i.e. the literacy rate of population excluding children aged 6 and below) is 43.15%.[2]
Demographics (2011 Census)[2]
| Total | Male | Female |
| Population | 1199 | 635 | 564 |
| Children aged below 6 years | 207 | 112 | 95 |
| Scheduled caste | 0 | 0 | 0 |
| Scheduled tribe | 1198 | 635 | 563 |
| Literates | 428 | 266 | 162 |
| Workers (all) | 702 | 360 | 342 |
| Main workers (total) | 38 | 22 | 16 |
| Main workers: Cultivators | 10 | 5 | 5 |
| Main workers: Agricultural labourers | 5 | 3 | 2 |
| Main workers: Household industry workers | 1 | 1 | 0 |
| Main workers: Other | 22 | 13 | 9 |
| Marginal workers (total) | 664 | 338 | 326 |
| Marginal workers: Cultivators | 561 | 279 | 282 |
| Marginal workers: Agricultural labourers | 5 | 1 | 4 |
| Marginal workers: Household industry workers | 0 | 0 | 0 |
| Marginal workers: Others | 98 | 58 | 40 |
| Non-workers | 497 | 275 | 222 |