As of April 2025, the population of Cook Islands is 17.1 thousand. The number of inhabitants has increased by 29 in the last year, representing a growth of 0.18%. The median age of the population has increased in recent years, rising from 30.5 years in 2015 to 33.5 years in 2025. Currently, life expectancy at birth is 75.7 years and population density is 71.3 inhabitants per square kilometer.
The population growth rate of Cook Islands peaked in 2008, reaching around 3.54% annually, but has since declined to approximately 0.17% in 2025. The annual increase in the number of people has also decreased from a peak of around 580 in 2010 to nearly 29 in 2025.
In Cook Islands, life expectancy at birth has been increasing, with the indicator rising from 71.6 years in 2005 to 75.7 years in 2025, representing an increase of more than 4 years over the past 2 decades.