I think they have only mapped out around 50 cities in North America, although it could be even a smaller number than that. But if you ever wanted to play real live PacMan on the streets of Washington, DC, now is your chance, using this link:
If you want to play in one of the other available major cities, go to: Google Maps, and look for the PacMan icon in the lower left corner of the browser window. If you see it, click it, and play the game on the streets of your preferred city. I suspect this is yet another Google implementation that could evaporate as soon it is no longer Aprils Fools Day, but I intend to play it for all it is worth until it expires!