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Dairy Flat is a rural district 8 km south of Orewa and 28 km north of central Auckland in the North Island of New Zealand. Until the early 1990s most of the district was in dairy farms of 40 to 60 hectares (100 to 150 acres). With the growth of Auckland and the extension of the Northern Motorway into the area, these are being gradually subdivided into of around 2 to 5 hectares (5 to 12 acres), many of which are grazing sheep, horses, beef cattle or deer. Although it still retains a rural character, it is counted as part of the Auckland urban area in official statistics.
Lime quarrying began in the early 1920s. Local residents lobbied for the area's name to be changed from Dairy Flat to Pine Valley in 1931, but were unsuccessful. The area started to be used for flights in the early 1960s, and in 1963 the North Shore Aero Club was established, operating from North Shore Aerodrome.
The Redvale lime quarry started operating in the 1960s. Waste Management Incorporated bought the quarry site in 1988 and began operating it as Redvale Landfill in 1993. As of 2025 it was taking more than half of Auckland's rubbish. Methane created by the decomposing waste at the landfill is used to generate electricity. Redvale Landfill and Energy, managed by Waste Management NZ, is consented until 2028.
The area was administered by Rodney County Council until 1989, then by Rodney District from 1989 to 2010. It has been administered by Auckland Council since 2010 and is in its Rodney ward.
The Auckland Surf Park is a heated artificial surfing lagoon being built in Dairy Flat and expected to open in 2027.
Dairy Flat had a population of 4,977 in the 2023 New Zealand census, an increase of 363 people (7.9%) since the 2018 census, and an increase of 774 people (18.4%) since the 2013 census. There were 2,553 males, 2,409 females and 18 people of other genders in 1,542 dwellings. 2.7% of people identified as LGBTQ. The median age was 40.5 years (compared with 38.1 years nationally). There were 840 people (16.9%) aged under 15 years, 1,020 (20.5%) aged 15 to 29, 2,403 (48.3%) aged 30 to 64, and 714 (14.3%) aged 65 or older.
People could identify as more than one ethnicity. The results were 76.9% European (Pākehā); 8.9% Māori; 2.3% Pasifika; 19.0% Asian; 1.2% Middle Eastern, Latin American and African New Zealanders (MELAA); and 2.5% other, which includes people giving their ethnicity as "New Zealander". English was spoken by 94.1%, Māori language by 1.9%, Samoan by 0.2%, and other languages by 22.3%. No language could be spoken by 1.4% (e.g. too young to talk). New Zealand Sign Language was known by 0.3%. The percentage of people born overseas was 35.0, compared with 28.8% nationally.
Religious affiliations were 28.0% Christian, 0.5% Hindu, 0.8% Islam, 0.2% Māori religious beliefs, 0.7% Buddhist, 0.5% New Age, 0.2% Jewish, and 1.3% other religions. People who answered that they had no religion were 61.6%, and 6.4% of people did not answer the census question.
Of those at least 15 years old, 897 (21.7%) people had a bachelor's or higher degree, 2,085 (50.4%) had a post-high school certificate or diploma, and 909 (22.0%) people exclusively held high school qualifications. The median income was $47,300, compared with $41,500 nationally. 753 people (18.2%) earned over $100,000 compared to 12.1% nationally. The employment status of those at least 15 was that 2,220 (53.7%) people were employed full-time, 627 (15.2%) were part-time, and 111 (2.7%) were unemployed.
| +Individual statistical areas |
| $42,500 |
| $51,500 |
| $49,300 |
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