Hornby comprised four statistical areas in 2018.
Commercial area The Hornby Central statistical area covers on the north side of Hornby. It had an estimated population of as of with a population density of people per km2. Hornby Central had a population of 135 at the
2018 New Zealand census, an increase of 15 people (12.5%) since the
2013 census, and a decrease of 21 people (−13.5%) since the
2006 census. There were 45 households, comprising 75 males and 57 females, giving a sex ratio of 1.32 males per female. The median age was 43.4 years (compared with 37.4 years nationally), with 15 people (11.1%) aged under 15 years, 30 (22.2%) aged 15 to 29, 75 (55.6%) aged 30 to 64, and 12 (8.9%) aged 65 or older. Ethnicities were 68.9% European/
Pākehā, 15.6%
Māori, 6.7%
Pasifika, 17.8%
Asian, and 2.2% other ethnicities. 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, 51.1% had no religion, 33.3% were
Christian, 2.2% had
Māori religious beliefs and 4.4% had other religions. Of those at least 15 years old, 12 (10.0%) people had a bachelor's or higher degree, and 24 (20.0%) people had no formal qualifications. The median income was $35,000, compared with $31,800 nationally. 12 people (10.0%) earned over $70,000 compared to 17.2% nationally. The employment status of those at least 15 was that 66 (55.0%) people were employed full-time, 15 (12.5%) were part-time, and 12 (10.0%) were unemployed.
Residential Hornby The residential areas of Hornby, comprising the statistical areas of Hornby West and Hornby South in 2018, and also Branston in 2023, cover .
Islington-Hornby Industrial area The Islington-Hornby Industrial area covers to the south of Hornby. ==Transport==