What are Colleges located in highly populated towns or cities called?

There isn't a specific, universally accepted term for colleges located in highly populated towns or cities. However, you could describe them using terms like:

* Urban colleges: This is probably the most common and widely understood term.

* City colleges: Similar to "urban colleges," emphasizing the location within a city.

* Metropolitan colleges: This suggests a location within a larger metropolitan area.

The best term to use will depend on the specific context and the nuance you want to convey.