Devonport had a population of 3,348 at the 2018 New Zealand census, a decrease of 66 people (-1.9%) since the 2013 census, and a decrease of 69 people (-2.0%) since the 2006 census. There were 1,275 households. There were 1,590 males and 1,758 females, giving a sex ratio of 0.9 males per female. The median age was 45.5 years, with 615 people (18.4%) aged under 15 years, 534 (15.9%) aged 15 to 29, 1,575 (47.0%) aged 30 to 64, and 627 (18.7%) aged 65 or older.