The United Nations (UN) Sustainable Development Goal 11 “Sustainable Cities and Communities” (SDG 11) is linked with the 16 other SDGs to varying extents. Studying these relationships can provide insight into the strengths and weaknesses of the current SDG framework and set the stage for improvements to the next version. We analyze data from the UN database of 221 “good practices” for SDG 11 submitted between 2018 and 2021 to determine the most and least frequent linkages between SDG 11 and other SDGs as well as differences in such linkages between developed and developing countries. We find SDG 11 most closely associated with SDG 17 “Partnership for the Goals” and SDG 13 “Climate Action”. This shows actors’ perceptions of the centrality of international partnerships and climate action in addressing urban sustainability challenges. Connections with SDG 7 “Affordable and Clean Energy”, SDG 2 “Zero Hunger”, and SDG 16 “Peace, Justice, and Strong Institutions” were surprisingly weak, given the role of clean energy in addressing the climate crisis, the prevalence of poverty and hunger within cities, and the importance of institutions. Developing countries more frequently linked SDG 11 with SDG 5 “Gender Equality” and SDG 6 “Clear Water and Sanitation”, showing a focus on basic infrastructure and gender equity dimensions of sustainability. Developed countries associated SDG 11 more strongly with natural resources, environmental sustainability, and economic production. These findings suggest that more specific targets, indicators, and international support related to energy, poverty, hunger, and institutions may be needed within post-2030 iterations of SDG 11.