The Alexandra urban area had a usual resident population of 5,475 at the 2018 New Zealand census, an increase of 675 people (14.1%) since the 2013 census, and an increase of 648 people (13.4%) since the 2006 census. There were 2,661 males and 2,811 females, giving a sex ratio of 0.95 males per female. Of the total population, 909 people (16.6%) were aged up to 15 years, 729 (13.3%) were 15 to 29, 4,596 (41.0%) were 30 to 64, and 1,686 (29.0%) were 65 or older.