South Wairarapa District had a population of 10,575 at the 2018 New Zealand census, an increase of 1,047 people (11.0%) since the 2013 census, and an increase of 1,683 people (18.9%) since the 2006 census. There were 4,335 households. There were 5,271 males and 5,307 females, giving a sex ratio of 0.99 males per female. The median age was 47.1 years, with 1,917 people (18.1%) aged up to 15 years, 1,314 (12.4%) aged 15 to 29, 5,025 (47.5%) aged 30 to 64, and 2,319 (21.9%) aged 65 or older.