There is one house within walking distance to my job: the farmhouse that was here before it was developed. (there used to be two houses, but one was torn down last year when the owners sold). There is an apartment complex a long walk away but there are not enough units there for everybody who works in this office park. Even if you lived in either of the above you would need a car because there are no grocery stores withing walking distance. That is all my choices for living close to work. There is no transit within walking distance either. In short, if I'm to not have a car I need a different job. This situation is not unusual in the US.

People are very attached to their cars, thus they invent reasons to keep them. If you can walk to work you do not need a car, travel to work is one of the few good reasons to own one.