At the last New Zealand census in 2013, the combined population of the Marlborough and Kaikoura regions was 49,857. The majority of these people are located in the towns of Blenheim, Picton and Kaikoura. Blenheim, which is located on the fertile Wairau Plain, has a population of over 24,000; Picton, at the terminus for the Wellington-Picton ferries, has a population of over 2,500; and the Kaikoura township has a population of 3,555.

Main population centres:  
Blenheim 24,183
Renwick & Woodbourne 2,517
Picton 2,745
Havelock 489
Seddon 507
Kaikoura 3,555

Population mix:  
European 93%
Maori 13%
Pacific Island 1%
Asian & Other 1%

Age mix:
Under 15 20%
15 to 64 64%
65+ 16%

Statistics from Statistics New Zealand
It's a Fact...
CROISILLES HARBOUR
Croisilles Harbour, on the Tasman Bay side of the Marlborough Sounds and to the south of d'Urville Island, is named after Jeanne Francoise Julie Victoire de Croisilles, the mother of Dumont d'Urville, the French explorer and naval officer who explored the area in 1827. d'Urville declared the bay unsuitable for ships, although a safe anchorage and shelter from most winds.
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