School busses are the norm for rural and suburban schools. City public transport or walking is more common in larger metro areas, but in states that get very cold, even metro areas still have school busses so that young kids don't have to risk walking to a bus stop.

TBH, I have never heard of a US school district where the majority are driven to school by their parents, though to be fair to the parent poster I can't sat that I would be terribly surprised if such a place existed.