Hillmorton covers . It had an estimated population of as of with a population density of people per km2. Hillmorton had a population of 2,838 at the
2018 New Zealand census, an increase of 183 people (6.9%) since the
2013 census, and an increase of 678 people (31.4%) since the
2006 census. There were 1,089 households, comprising 1,383 males and 1,455 females, giving a sex ratio of 0.95 males per female. The median age was 38.2 years (compared with 37.4 years nationally), with 483 people (17.0%) aged under 15 years, 570 (20.1%) aged 15 to 29, 1,323 (46.6%) aged 30 to 64, and 462 (16.3%) aged 65 or older. Ethnicities were 77.1% European/
Pākehā, 8.9%
Māori, 3.8%
Pasifika, 16.3%
Asian, and 3.2% other ethnicities. People may identify with more than one ethnicity. The percentage of people born overseas was 26.0, compared with 27.1% nationally. Although some people chose not to answer the census's question about religious affiliation, 49.4% had no religion, 37.6% were
Christian, 0.5% had
Māori religious beliefs, 2.7% were
Hindu, 0.5% were
Muslim, 0.8% were
Buddhist and 2.5% had other religions. Of those at least 15 years old, 552 (23.4%) people had a bachelor's or higher degree, and 420 (17.8%) people had no formal qualifications. The median income was $35,300, compared with $31,800 nationally. 378 people (16.1%) earned over $70,000 compared to 17.2% nationally. The employment status of those at least 15 was that 1,260 (53.5%) people were employed full-time, 342 (14.5%) were part-time, and 63 (2.7%) were unemployed. ==Education==