This study examined 151 written district school wellness policies in Connecticut and found that significant improvement in school-level implementation of policies was reported after written policies were adopted. Stronger and more comprehensive written policies predicted significantly greater implementation of practices and policies at the school level. Some sociodemographic characteristics predicted the strength of wellness policies. The strength and comprehensiveness of the written policy was significantly positively correlated with the percentage of students eligible for free or reduced-price lunch, the population density of the town, and having a greater proportion of Democratic than Republican voters in the district.