Strowan covers . It had an estimated population of as of with a population density of people per km2. Strowan had a population of 3,507 at the
2018 New Zealand census, an increase of 108 people (3.2%) since the
2013 census, and a decrease of 138 people (−3.8%) since the
2006 census. There were 1,275 households, comprising 1,707 males and 1,803 females, giving a sex ratio of 0.95 males per female. The median age was 43.0 years (compared with 37.4 years nationally), with 690 people (19.7%) aged under 15 years, 615 (17.5%) aged 15 to 29, 1,611 (45.9%) aged 30 to 64, and 594 (16.9%) aged 65 or older. Ethnicities were 91.4% European/
Pākehā, 6.9%
Māori, 1.4%
Pasifika, 5.8%
Asian, and 1.7% other ethnicities. People may identify with more than one ethnicity. The percentage of people born overseas was 20.7, compared with 27.1% nationally. Although some people chose not to answer the census's question about religious affiliation, 48.8% had no religion, 44.3% were
Christian, 0.2% had
Māori religious beliefs, 0.1% were
Hindu, 0.3% were
Muslim, 0.7% were
Buddhist and 1.6% had other religions. Of those at least 15 years old, 1,026 (36.4%) people had a bachelor's or higher degree, and 264 (9.4%) people had no formal qualifications. The median income was $40,000, compared with $31,800 nationally. 810 people (28.8%) earned over $70,000 compared to 17.2% nationally. The employment status of those at least 15 was that 1,380 (49.0%) people were employed full-time, 483 (17.1%) were part-time, and 72 (2.6%) were unemployed. ==Education==