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Introduction. In Aotearoa New Zealand (NZ), there is inequity in rates of neural tube defects (NTDs). Among Maaori, NTD occur in 4.58/10 000 live births, and for Pacific peoples, it is 4.09/10 000 live births; this is compared to 2.81/10 000 live births for non-Maaori, non-Pacific peoples. Aim. To describe self-reported pre-pregnancy folic acid supplementation and to determine the association between pregnancy intendedness, ethnicity, parity, maternal age, care provider and pre-pregnancy folic acid supplementation. Methods. Secondary analysis of postpartum survey data collected at Te Whatu Ora Te Toka Tumai and Counties Manukau birthing facilities in 2020 was conducted. Descriptive analyses explored pregnancy intendedness and self-reported folic acid use by demographic variables. Multivariable logistic regression explored independent associations between demographic variables and folic acid use among intended pregnancies. Results. In total, 398 participants completed the survey. The response rate was (140/149) 94% at Counties Manukau and (258/315) 82% at Te Toka Tumai. Pre-pregnancy supplementation was reported by 182 of 398 participants (46%). Use was higher among those who intended their pregnancy (151/262, 58%) compared to those who were 'pregnancy ambivalent' (9/33, 27%) or did not intend to become pregnant (22/103, 21%). Factors independently associated with supplementation among intended pregnancies included: 'Other ethnicity' (European, Middle Eastern, Latin American, African) compared to Maaori (aOR 5.3 (95% CI 1.3, 21.8)), age =30 years compared to <30 years (aOR 2.1 (1.0, 4.1)), and private obstetrician compared to midwifery care (aOR 4.2 (1.6, 10.9)). Discussion. Low rates of pre-pregnancy folic acid supplementation exist in Auckland with significant ethnic disparity. Mandatory fortification of non-organic wheat is important, but supplementation is still recommended to maximally reduce risk. [ABSTRACT FROM AUTHOR]