What can I do to get a city ordinance enforced?
You have a couple of difffent options. The first is to try to sue the city for failure to enforce.  To most people, this seems like a logical option... however, suits against any governmental entities are extremely difficult because cities and police departments have what is called "governmental immunity."  This means that you can sue cities for certain things--- and this situation may or may not fall in that category.  To find out, unfortunately, requires an expensive lawsuit.Your second option is to continue nagging the chief of police.  To drive your point home, you may want to ask others to join in your request for enforcement.  Often, they will blow off one citizen, but will be more responsive to a group of citizens.  This is not necessarily a legal option... but still an option.Your third option is to contact the chief of police and request their assistance to set up a neighborhood watch group.  Again, this option focuses on increasing community involvment to combat the problem.A final option is to run for city mayor or council.  The council has the authority to recommend termination of any police chief that refuses to enforce the laws of their town.