Language retention
The proportion of people who can speak a "first language" (excluding English) of their ethnic group, for ethnic groups (other than Māori) with an established resident population in New Zealand.

| Region | % | ||
|---|---|---|---|
| 2001 | 2006 | ||
| 1 | Northland | 32.4 | 33.4 |
| 2 | Auckland | 62.4 | 63.7 |
| 3 | Waikato | 48.3 | 51.7 |
| 4 | Bay of Plenty | 40.6 | 43.8 |
| 5 | Gisborne | 34.8 | 36.6 |
| 6 | Hawke's Bay | 44.8 | 45.0 |
| 7 | Taranaki | 43.8 | 46.5 |
| 8 | Manawatu-Wanganui | 49.6 | 49.8 |
| 9 | Wellington | 58.4 | 57.0 |
| 10 | Tasman | 44.8 | 47.6 |
| 11 | Nelson | 48.8 | 48.3 |
| 12 | Marlborough | 42.4 | 47.0 |
| 13 | West Coast | 33.6 | 34.5 |
| 14 | Canterbury | 62.5 | 63.4 |
| 15 | Otago | 54.7 | 56.2 |
| 16 | Southland | 39.7 | 40.9 |
| Region | Born in NZ | Overseas born | Total | |||
|---|---|---|---|---|---|---|
| % | % | % | ||||
| 2001 | 2006 | 2001 | 2006 | 2001 | 2006 | |
| Northland | 9.8 | 9.9 | 67.2 | 69.5 | 32.4 | 33.4 |
| Auckland | 36.4 | 36.6 | 78.7 | 78.8 | 62.4 | 63.7 |
| Waikato | 19.3 | 19.8 | 75.5 | 75.8 | 48.3 | 51.7 |
| Bay of Plenty | 13.0 | 14.3 | 72.4 | 73.6 | 40.6 | 43.8 |
| Gisborne | 15.6 | 14.3 | 66.8 | 73.4 | 34.8 | 36.6 |
| Hawke's Bay | 17.8 | 18.5 | 72.7 | 74.1 | 44.8 | 45.0 |
| Taranaki | 14.2 | 15.8 | 75.7 | 73.6 | 43.8 | 46.5 |
| Manawatu-Wanganui | 22.8 | 21.3 | 76.0 | 76.1 | 49.6 | 49.8 |
| Wellington | 36.7 | 34.1 | 80.3 | 78.9 | 58.4 | 57.0 |
| Tasman | 12.7 | 9.8 | 73.2 | 74.3 | 44.8 | 47.6 |
| Nelson | 17.7 | 16.9 | 70.4 | 71.0 | 48.8 | 48.3 |
| Marlborough | 14.9 | 19.9 | 71.2 | 70.6 | 42.4 | 47.0 |
| West Coast | 6.3 | 6.9 | 61.6 | 62.6 | 33.6 | 34.5 |
| Canterbury | 29.3 | 28.7 | 79.5 | 78.8 | 62.5 | 63.4 |
| Otago | 23.3 | 22.7 | 75.1 | 76.0 | 54.7 | 56.2 |
| Southland | 13.4 | 13.3 | 69.6 | 73.7 | 39.7 | 40.9 |
