Boston/Cambridge/Brookline, Atlanta, Seattle...

Portland.

Denver

Depending on lifestyle and place of employment, being carless without a lot of sacrifices isn't necessarily limited to New York and Chicago. I know people in Boston and San Francisco without cars who use some combination of public transportation, Uber/taxis, Zipcar, and conventional rentals. That said, it's somewhere between inconvenient and very difficult in many places--including urban ones.

> public transportation, Uber/taxis, Zipcar, and conventional rentals

That doesn't add up to something more expensive than a car? I was in ny recently, and a train ticket on the LIRR cost ~20 round trip. That's $600/month. But, it's better overall because of the traffic to and in the city.

Well, somewhere like NY you also have to consider the cost of storing the car. You live in a dense city and transportation tends to be expensive one way or the other.

It really depends on a whole host of factors both related to the economics and the convenience. There are a few cities that tend to be particularly car unfriendly. Many where cars are essentially a requirement. And some that can go either way depending upon your lifestyle, where you work, and a variety of individual preferences.

But figure that a car is going to cost some X thousands of dollars a year plus whatever it costs you to park it. (The government rate is $0.57 or so per mile though that may not be that directly applicable to car vs. other transportation analysis.)

San Francisco is very bikeable/longboardable/electricgizmoable.

Source: I don't have a car, but I do have a motorized longboard.

Those are the only cities with ubiquitous rail transit. But you can do it in lots of other places if you insist on it or if you don't feel like you're above riding on buses, the latter of which are available in basically every major U.S. city.

I live in Columbus, and I looked at a bus route to work, and it was about 1.5 hours one way, with a transfer. For me, it's a 20 minute drive to work.

Also there is not service to/from most of the suburbs.