Objective: Identify non-distance factors related to children's active transport (AT) to school, including parental, home, and environment characteristics. Understanding the factors related to children's AT to school, beyond distance to school, could inform interventions to increase AT and children's overall physical activity. Study design: Participants were in the Neighborhood Impact on Kids Study, a longitudinal, observational cohort study of children aged 6-11 and their parents in King County, WA and San Diego County, CA between 2007 and 2009. Parents reported frequency and mode of child transport to school, perceived neighbourhood, home and family environments, parental travel behaviours, and sociodemographics. Methods: Children living less than a 20 minute walk to school were in this analysis. Children classified as active transporters (walked/bicycled to or from school at least once per week) were compared with those not using AT as often. Results: Children using AT were older and had parents who reported themselves using active transport. Having a family rule that restricts the child to stay within sight of the parent or home and more parent working hours were related to lower odds of a child using AT. Conclusions: Children's AT to school is associated with parental AT to work and other locations. Interventions should be considered that enable whole family AT, ameliorate safety concerns and decrease the need for parental supervision, such as walking school buses. (C) 2014 The Royal Society for Public Health. Published by Elsevier Ltd. All rights reserved.