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...
SATELLITE SPIES
The Government Communications Security Bureau operates a satellite spy base in the Waihopai Valley, near Renwick. The base is part of the ECHELON spy network, run by the UKUSA alliance of intelligence agencies. Shielded by two giant, white domes, its satellite dishes intercept a huge volume of international phone calls, telexes, faxes, e-mail and computer data communications. It gathers this data and forwards it the UKUSA alliance.
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