However, if this field is not meaningful, that is it is strictly for the database to internally identify a unique record, it is a surrogate key or blind key. In this case Person ID probably is an AutoNumber field, and it should not be used except internally by the database.
It's the city of New York that is divided into boroughs. In 1898, the modern city of New York was formed by merging the County of New York (modern day Manhattan and the Bronx), the then independent city of Brooklyn, Richmond County, and the western parts of then Queens County (the remainder is modern day Nassau County). To make people happy, the new city was divided into boroughs (similar to London). The original city of New York became Manhattan (named after the island it is on). The remainder of New York County became The Bronx. Brooklyn stayed Brooklyn. Queens County is also Queens. And Richmond County became Staten Island (also named after the island it is on).
The government of New York City is organized under the New York City Charter and provides for a strong mayor-council system. The mayor is elected to a four-year term and is responsible for the administration of city government. The New York City Council is a unicameral body consisting of 51 members, each elected from a geographic district, normally for four-year terms. All elected officials are limited to a three consecutive-term limit The court system consists of two city courts and three state courts. New York City government employs 325,000 persons, more than any city in the United States and more than all except three U.S. states: California, Texas, and New York.