Coatesville is an affluent, rural community situated approximately 30 km north-west of Auckland, New Zealand. Albany lies to the east, Paremoremo to the south, Riverhead to the south-west, and Dairy Flat to the north.

The area was called Fernielea until 1926, when it was renamed after Gordon Coates, the Prime Minister at the time.

Mincher is a garden of national significance in Coatesville. Other gardens open to the public by appointment include Woodbridge and Twin Lakes.

Coatesville covers 21.59 km (8.34 sq mi) and had an estimated population of 2,140 as of June 2024, with a population density of 99 people per km.

Historical population

Year	Pop.	±% p.a.
2006	1,974	—
2013	2,223	+1.71%
2018	2,328	+0.93%
Source:

Before the 2023 census, Coatesville had a larger boundary, covering 24.37 km (9.41 sq mi). Using that boundary, Coatesville had a population of 2,328 at the 2018 New Zealand census, an increase of 105 people (4.7%) since the 2013 census, and an increase of 354 people (17.9%) since the 2006 census. There were 744 households, comprising 1,146 males and 1,182 females, giving a sex ratio of 0.97 males per female. The median age was 42.7 years (compared with 37.4 years nationally), with 441 people (18.9%) aged under 15 years, 444 (19.1%) aged 15 to 29, 1,152 (49.5%) aged 30 to 64, and 291 (12.5%) aged 65 or older.

Ethnicities were 88.8% European/Pākehā, 4.4% Māori, 1.9% Pacific peoples, 10.1% Asian, and 1.2% other ethnicities. People may identify with more than one ethnicity.

The percentage of people born overseas was 32.3, compared with 27.1% nationally.

Although some people chose not to answer the census's question about religious affiliation, 58.2% had no religion, 32.0% were Christian, 0.6% were Hindu, 0.1% were Muslim, 0.4% were Buddhist and 1.7% had other religions.

Of those at least 15 years old, 612 (32.4%) people had a bachelor's or higher degree, and 147 (7.8%) people had no formal qualifications. The median income was $46,000, compared with $31,800 nationally. 618 people (32.8%) earned over $70,000 compared to 17.2% nationally. The employment status of those at least 15 was that 1,002 (53.1%) people were employed full-time, 345 (18.3%) were part-time, and 33 (1.7%) were unemployed.

Coatesville School is a coeducational contributing primary (years 1–6) school with a roll of 277 students as at August 2024, A school was first established in the area in 1916, but it closed in 1920. A new school opened in 1923. The school celebrated 100 years on 16 of October 2016.

Coatesville Playcentre started in Coatesville Hall in the 1970s before moving into a purpose built centre next to the school in the 1980s. Playcentre offers parent-led early childhood education for children aged 0–5 years.

Coatesville Learning Centre opened in 2012 catering for 1- to 5-year-old children.