A US municipality environmental sustainability index, the OSSPI (Opp-Saunders Sustainability Practices Index), found an overwhelming percentage of top-ranked sustainable cities were home to higher education institutions. While this may be a coincidence, this research seeks to determine if and how local communities partner or collaborate with higher education institutions for environmental sustainability purposes. The results of two case studies, San Antonio, Texas and Dubuque, Iowa, suggest there is considerable variability in the town-gown relationships. However, it is found that larger, public universities are more likely to have stronger relationships and effects on local sustainability efforts.