Koromiko is a locality in Marlborough, New Zealand. State Highway 1 runs through the area. Picton is about 6.5 km to the northeest, and Blenheim is about 21 km to the south. Picton Airport is located at Koromiko. It has flights to and from Wellington several times a day operated by Sounds Air. Koromiko School is a coeducational full primary (years 1-8) school with a decile rating of 4 and a roll of 39. The school was founded in 1873.