Kapiti Coast District had a population of 53,673 at the 2018 New Zealand census, an increase of 4,569 people (9.3%) since the 2013 census, and an increase of 7,476 people (16.2%) since the 2006 census. There were 21,753 households. There were 25,314 males and 28,359 females, giving a sex ratio of 0.89 males per female. Of the total population, 9,285 people (17.3%) were aged up to 15 years, 7,386 (13.8%) were 15 to 29, 22,935 (42.7%) were 30 to 64, and 14,067 (26.2%) were 65 or older. Figures may not add up to the total due to rounding.