In the US and for those that live outside of municipal boundaries and that live in unincorporated regions, lots of states have "townships" that are the default local government below county-level. Municipal corporations like towns and cities replace townships.
Still, those townships have local governments that can be engaged with politically.
And then there's counties in the US which act as the local government overseeing townships, etc.
People's political activism doesn't have to start and end in towns/cities.