Three Lists of Cities and States:
WeAreStillIn - lists the 9 states, and 217 cities (and counting), as well as businesses and universities still supporting Paris Agreement goals
US Conference of Mayors - 250+ mayors (of cities with populations of 30,000 or more) signed a resolution supporting to a transition to 100% renewable energy by 2035
Climate Mayors - 338 Mayors commit to adopt and uphold the goals of the Paris Agreement
CityLab article: "Can Cities Actually Meet the Paris Commitments on Their Own?" is a really helpful discussion of the issues at play.
(Listing here does not indicate a relationship between these organizations and Communitopia)