The Area Codes of New Zealand / Aotearoa: City/Town or RegionArea code 1.Hamilton0756 (+64756) 2.Hamilton0783 (+64783) 3.Hamilton0784 (+64784) 4.Hamilton0785 (+64785) 5.Hamilton0795 (+64795) 6.Hamilton0796 (+64796) 7.Hamilton, Huntly0782 (+64782) 8.Hastings0687 (+64687) 9.Hawera0627 (+64627) 10.Helensville, Warkworth, Hibiscus Coast, Great Barrier Island0942 (+64942) 11.Hokitika, Franz Josef Glacier, Fox Glacier, Haast0375 (+64375)