Koromiko is a locality in Marlborough, New Zealand. State Highway 1 runs through the area. Picton is about to the northeast, and Blenheim is about to the south.
Picton Aerodrome is located at Koromiko. It has flights to and from Wellington several times a day operated by Sounds Air.
Demographics Koromiko locality covers . It is part of the larger Marlborough Sounds East statistical area.
Koromiko had a population of 396 in the 2023 New Zealand census, a decrease of 6 people (−1.5%) since the 2018 census, and an increase of 75 people (23.4%) since the 2013 census. There were 192 males, 201 females, and 3 people of other genders in 159 dwellings. 2.3% of people identified as LGBTIQ+. There were 54 people (13.6%) aged under 15 years, 45 (11.4%) aged 15 to 29, 210 (53.0%) aged 30 to 64, and 81 (20.5%) aged 65 or older.
People could identify as more than one ethnicity. The results were 93.2% European (Pākehā), 20.5% Māori, 1.5% Pasifika, and 3.0% other, which includes people giving their ethnicity as "New Zealander". English was spoken by 100.0%, Māori by 2.3%, and other languages by 3.0%. New Zealand Sign Language was known by 0.8%. The percentage of people born overseas was 10.6, compared with 28.8% nationally.
Religious affiliations were 25.0% Christian, 1.5% Māori religious beliefs, 0.8% Jewish, and 0.8% other religions. People who answered that they had no religion were 63.6%, and 8.3% of people did not answer the census question.
Of those at least 15 years old, 33 (9.6%) people had a bachelor's or higher degree, 201 (58.8%) had a post-high school certificate or diploma, and 105 (30.7%) people exclusively held high school qualifications. 27 people (7.9%) earned over $100,000 compared to 12.1% nationally. The employment status of those at least 15 was 192 (56.1%) full-time, 57 (16.7%) part-time, and 3 (0.9%) unemployed.
Education Koromiko School was a coeducational full primary (years 1–8) school. It was founded in 1873, and closed at the beginning of 2013.
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