Adapted from NZ Regional Councils and Territorial Authorities 2017 by Korakys, CC BY-SA 4.0.
The NZIC has six branches based on geographical location. Members resident or temporarily overseas belong to a group managed by the NZIC Administrator.
Auckland branch covers the North Auckland District. This district covers the area north of a line drawn from the mouth of the Waikato to the Firth of Thames, not including the Coromandel Peninsula.
Waikato branch covers the South Auckland District. This district covers the Waikato, Coromandel, Bay of Plenty, Rotorua and Taupo.
Manawatu branch covers Taranaki, Wanganui, Manawatu, Hawkes Bay, Gisborne, and the area north of a line from Otaki to Cape Turnagain.
The Wellington branch covers the part of the Wellington District not included in the Manawatu Branch together with the Marlborough and Nelson Land Districts.
The Canterbury branch covers Canterbury and Westland Districts.
The Otago branch covers the Otago and Southland Districts.