Glendowie, comprising the statistical areas of Glendowie North and Glendowie South, had a population of 8,832 at the 2018 New Zealand census, an increase of 381 people (4.5%) since the 2013 census, and an increase of 861 people (10.8%) since the 2006 census. There were 2,877 households. There were 4,359 males and 4,476 females, giving a sex ratio of 0.97 males per female, with 1,932 people (21.9%) aged under 15 years, 1,515 (17.2%) aged 15 to 29, 3,987 (45.1%) aged 30 to 64, and 1,398 (15.8%) aged 65 or older.