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Okay, I'll say it: I don't think Dick should have a designated city.
I think the idea of him traveling around the world, helping wherever he can with a team (or even alone if the mission doesn't require metas necessarily) is a lot more interesting than having him take care of a single city the way Batman does.
There's still the special occasions when saving the world or assisting another hero if they need help, but I feel having him move often from a city to another for his hero work would link back to his roots in the circus.
It'd also be an opportunity to explore his relationships in the hero-community and his central role in it. He's a person with connections, a natural leader, and it doesn't make sense to me to keep him so isolated in Bludhaven.