Harbourside had a population of 45 at the 2018 New Zealand census, a decrease of 3 people (−6.2%) since the 2013 census, and a decrease of 15 people (−25.0%) since the 2006 census. There were 24 households, comprising 27 males and 18 females, giving a sex ratio of 1.5 males per female. The median age was 23.6 years (compared with 37.4 years nationally), with 3 people (6.7%) aged under 15 years, 21 (46.7%) aged 15 to 29, 18 (40.0%) aged 30 to 64, and 3 (6.7%) aged 65 or older.
Ethnicities were 86.7% European/Pākehā, 13.3% Māori, and 13.3% Asian. People may identify with more than one ethnicity.
The percentage of people born overseas was 26.7, compared with 27.1% nationally.
Although some people chose not to answer the census's question about religious affiliation, 33.3% had no religion, 33.3% were Christian, 6.7% were Muslim and 6.7% had other religions.
Of those at least 15 years old, 12 (28.6%) people had a bachelor's or higher degree, and 3 (7.1%) people had no formal qualifications. The median income was $15,500, compared with $31,800 nationally. 3 people (7.1%) earned over $70,000 compared to 17.2% nationally. The employment status of those at least 15 was that 15 (35.7%) people were employed full-time, 6 (14.3%) were part-time, and 6 (14.3%) were unemployed.[6]
