The overwhelming majority of homes in US/Canada are fed single phase 240v with phases split to provide 120v to standard outlets, 240v on opposite phase arrangement.
I can guarantee you there are SIGNIFICANTLY more households (not homes, as this is generally apartments) 208v service which is a Y split from three phase 480v, than there are households without 240v service.
I seriously don't know of houses without 240v service, with my only guess being houses with 100+ year old electrical systems