They’re the hot spots for bar-hopping, busy downtown streets, near local hospitals, and, in some cases, right next to a college.

These are the places where people most often walk back to their cars and throw their hands up into the air when they see that small piece of paper wedged under their windshield wiper — a parking ticket.

In Baltimore, blocks near major retail areas and the University of Maryland Medical Center are the most heavily ticketed for a wide range of violations — from having…