This study analyzes the relationships between four factors related to the eco-policies of Toyota City, Japan, and its citizens' environmental awareness: i.e. residence (Toyota City citizens or noncitizens), time of research (2012, 2015, and 2018), sex, and age. Understanding these factors is crucial for the municipal government to assess its success or failure in terms of promoting its eco-policies and to identify and address the population segments that are unaware of these eco-policies. In this study, 997 respondents completed a questionnaire to analyze the above-stated factors and environmental awareness. The findings suggest that all factors are likely to be associated with environmental awareness of Toyota City's eco-policies. That is, citizens tend to be more aware of the city's eco-policies than noncitizens; respondents in the 2015 and 2018 studies tend to be more aware of the eco-policies than those in the 2012 study; men tend to be more aware of the eco-policies than women; and respondents over 30 years old tend to be more aware of the eco-policies than respondents under 30 years old. Following these findings, this study suggests the need to target women and citizens under 30 to promote ecopolicies. Finally, some suggestions for the promotion of eco-policies were discussed.