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.

Here's some information about my area which has 26 council members that
Are apportioned throughout the county based on each district's population:

Louisville Metro Council - Wikipedia, the free encyclopedia

If you're still looking for information on this, Norway, also has a
Population-based county government. It is based in Oslo.

"The Storting is elected by county on the basis of proportional representation, i.e.
each county is awarded a specified number of representatives based on its population."

Heres's a link: The Storting (Norway - the official site in the United States)