The Salud Mesoamérica Initiative (SMI) focuses on reducing inequalities in maternal and child health in Mesoamerica. This dataset is the product of an SMI impact evaluation. It includes results of a baseline survey of women of reproductive age conducted in three districts in Belize: Cayo, Corozal, and Orange Walk. The survey employed a Lot Quality Assurance Sampling (LQAS) methodology. The target sample size was 350 women. In half of the sample locations selected, eligible women (ages 15-49) were interviewed through convenience samples taken in public spaces such as markets and town centers. In the other half of the locations, all eligible women were interviewed at randomly selected households. Information was collected on demographic characteristics; healthcare access and use; and perceived quality of key interventions for women of reproductive age and children.