* cost of rent/purchase
* cost of transport: public transport vs car+park vs walk
* cost of goods: city prices are less than country prices!
Its highly city specific. The variance for NY or SF is not the same as the variance for Philly or Buffalo.
Arguably, (as a non US resident so this is theoretical) the HMO and associated costs might vary because of provider choice. Also, if you have a family, there are associated costs of schooling and recreation for kids.
You cannot realistically set financial value on "quality of life" directly from others. Its innately subjective. I place a very high value on quality of life: I prefer inner city and I would demand a premium to have to work rural, but I know people with exactly the opposite drives and motivations!
Also, don't set your salary requirements based on what it'd take to live off of. Set your salary requirements based on what your peers are making, which you can easily find out through GlassDoor, levels.fyi, etc. these days. It's very easy to low-ball yourself with cost+ accounting, while if you have a good picture of market rates you charge what it'd take to replace you and can bank the excess.