Size of elected governing body based on population

I want to know of any places in the world where a certain jurisdiction has a different number of (elected) council members based on whether the jurisdiction's population is above or below a certain threshold. For instance, in Pennsylvania (where I live) the boroughs (i.e. small cities) have 7 council members if the population is above 3,000 and they have 5 if the population is below 3,000. I would be interested to know about situations like this on *any* level of governance (e.g. state, city, etc.). I know this is an unusual question but I would very much appreciate your help. Thanks.