IPA: /ˌʌnɪnˈkɔːpəreɪtɪd/
KK: /ʌnɪnˈkɔːrpəreɪtɪd/
Not part of a city or town and not organized as a corporation.
The area is unincorporated, meaning it is not governed by a local municipal corporation.
Unincorporated → It is formed from "un-" (meaning not) and "incorporated" (from Latin "incorporare", meaning to form into a body or to embody). The word "unincorporated" means not formed into a legal corporation or body.
Think of 'not' ('un-') being added to 'formed into a body' ('incorporated') — that's why unincorporated means not formed into a legal entity.