As far as I’m aware, every US city where it’s at all common (let’s say 10%+ of households) to live without a car, it’s extremely expensive to live. Are there gems that I’m unaware of?

There are cities in the Midwest with a large carfree share by necessity (income) but as far as by choice/design, Philly and Baltimore appear to hover around 25-30%

New Orleans

Probably not a great place to move to right now.

https://news.ycombinator.com/item?id=48015218

Philly