 Total NZ by region/constituency | | 4,900,600 | 4,979,200 | 5,090,200 | 5,111,300 | 5,117,200 | 5,223,100 |
| Northland region | | 185,800 | 189,100 | 194,600 | 198,500 | 201,200 | 203,900 |
| Auckland region | | 1,654,800 | 1,681,300 | 1,714,200 | 1,704,700 | 1,692,300 | 1,739,300 |
| Waikato region | | 475,600 | 485,700 | 500,100 | 506,400 | 510,900 | 522,600 |
| Bay of Plenty region | | 320,800 | 328,200 | 339,200 | 344,100 | 346,900 | 354,100 |
| Gisborne region | | 49,500 | 50,200 | 51,400 | 51,700 | 52,000 | 52,600 |
| Hawke's Bay region | | 172,400 | 174,900 | 180,000 | 182,100 | 182,800 | 184,800 |
| Taranaki region | | 121,200 | 123,100 | 125,200 | 126,500 | 127,300 | 128,700 |
| Manawatu-Whanganui region | | 247,500 | 250,600 | 254,600 | 256,700 | 257,600 | 260,900 |
| Wellington region | | 525,900 | 532,600 | 542,100 | 544,600 | 543,700 | 550,500 |
| Tasman region | | 54,000 | 54,900 | 57,300 | 58,100 | 58,600 | 59,400 |
| Nelson region | | 52,700 | 53,400 | 54,900 | 54,900 | 55,000 | 55,600 |
| Marlborough region | | 48,700 | 49,300 | 51,300 | 51,600 | 51,600 | 52,200 |
| West Coast region | | 32,400 | 32,500 | 32,800 | 32,900 | 32,800 | 32,900 |
| Canterbury region | | 622,800 | 631,700 | 644,000 | 649,000 | 653,400 | 666,300 |
| Otago region | | 235,000 | 239,400 | 245,000 | 246,400 | 248,000 | 254,600 |
| Southland region | | 100,500 | 101,600 | 102,800 | 102,500 | 102,500 | 103,900 |
| Area outside region | | 690 | 710 | 750 | 750 | 740 | 740 |
| Total, North Island regions | | 3,753,700 | 3,815,700 | 3,901,300 | 3,915,300 | 3,914,600 | 3,997,300 |
| Total, South Island regions | | 1,146,200 | 1,162,800 | 1,188,100 | 1,195,300 | 1,201,800 | 1,225,000 |