Dargaville had a population of 4,794 at the 2018 New Zealand census, an increase of 543 people (12.8%) since the 2013 census, and an increase of 339 people (7.6%) since the 2006 census. There were 1,812 households. There were 2,325 males and 2,469 females, giving a sex ratio of 0.94 males per female. Of the total population, 936 people (19.5%) were aged up to 15 years, 840 (17.5%) were 15 to 29, 1,785 (37.2%) were 30 to 64, and 1,233 (25.7%) were 65 or older. Figures may not add up to the total due to rounding.