borough

noun

in certain states of the U.S., a self-governing, incorporated town
the basic unit of local government in Alaska (in full ): the unincorporated area of the state, governed by the legislature, is called the
any of the five administrative units of New York City
in England
1. a town with a municipal corporation and rights to self-government granted by royal charter
2. a town that sends one or more representatives to Parliament
3. Obsolete any fortified town larger than a village

See borough in American Heritage Dictionary 4