Purpose: The purpose of this study was to examine if young children’s prosocial behavior were different depending on socio-demographic variables and maternal community living competence. Method: The participants were 387 mothers from 4 cities. The mothers, who sent their children to kindergartens and child care centers, were asked to fill and return the questionnaires. The data was analyzed by t-test, ANOVA, and Scheffé post hoc test with the SPSS 23.0 program. Results: Firstly, when taken into account the effects of age and birth order, younger children and second born children showed higher scores of prosocial behavior. However, helping, a sub-factor of prosocial behavior, was not affected by the two variables. Additionally, no statistical difference was identified between genders. Secondly, when taken into the effects of maternal community living competence consisted of three elements, knowledge, skills, and attitudes, the children of mothers with higher skills and attitudes showed higher prosocial behavior. However, the children of mothers who had higher knowledge did not show any difference except for helping. Conclusion: Young children’s prosocial behaviors were different depending on their age, birth order and maternal community living competence elements. This study has shown that systematic parent education, which reflected parental community living competence, was demanded in order to promote young children’s prosocial behavior.