I'm pretty sure that the City in Blade Runner is meant to be mostly abandoned and not crowded. Most of the people had left for off world. People who live there are not fit enough to travel to the colonies, can't afford it or have some other reason to stay behind. Maybe I just got confused about something between the PKD book and the movie. I haven't read or seen either in many years.

The novel "Metal Fatigue" by Sean Williams is a good example of Cyber Noir. An investigator in a closed off American city investigates a series of murders after a Nuclear war while trying to keep his military cyborg past a secret.

Neuromancer (1988) was made into a game but I don't think I would really call it Noir.