| Urban Area Type | Average Household Size | |||||
| 1971 | 1981 | 1991 | 2001 | 2011 | 2021 | |
| M. C./Agglomeration | 5.58 | 5.55 | 6.23 | 6 | 5.90 | 5.50 |
| Class-A Municipalities | 5.51 | 6.03 | 5.40 | 5.35 | 5.35 | 5.30 |
| Class-B Municipalities | 5.38 | 5.62 | 5.39 | 5.3 | 5.30 | 5.30 |
| Class-C Municipalities | 5.36 | 5.66 | 5.53 | 5.5 | 5.40 | 5.35 |
| Class-D Municipalities | 5.06 | 5.40 | 5.15 | 5.15 | 5.10 | 5.00 |
| Others | 5.25 | 5.51 | 5.35 | 5.3 | 5.30 | 5.30 |