People who live in more rural areas have at least one car per household.
Most families who live in the countryside have at least one car per family.
1) People who live in more rural areas have at least one car per household.
「田舎に住む人々は最低でも一家に一台は車を持っている。」
rural area で「田舎・地方」
household で「一家・世帯」
at least で「最低でも」
one car per household で「一家に車一台」
2) Most families who live in the countryside have at least one car per family.
「田舎に住む一家は最低でも一家族に一台は車を持っている。」
countryside で「田舎・地方」とも言えます。
one car per family で「一家に車一台」
ご参考になれば幸いです!