Plattsburgh is a city in and county seat

County seat

A county seat is an administrative center, or seat of government, for a county or civil parish. The term is primarily used in the United States....

 of Clinton County, New York

Clinton County, New York

Clinton County is a county located in the U.S. state of New York. As of the 2010 census, the population was 82,128. Its name is in honor of the first Governor of New York as a state, George Clinton. Its county seat is Plattsburgh.-History:...

, United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

. The population was 19,989 at the 2010 census

United States Census, 2010

The Twenty-third United States Census, known as Census 2010 or the 2010 Census, is the current national census of the United States. National Census Day was April 1, 2010 and is the reference date used in enumerating individuals...

. The population of the unincorporated areas within the Town of Plattsburgh

Plattsburgh (town), New York

Plattsburgh is a town in Clinton County, New York, United States. The population was 11,870 at the 2010 census. The town is named after Zephaniah Platt, an early land owner.The Town of Plattsburgh borders the City of Plattsburgh...

 was 11,870 as of the 2010 census

United States Census, 2010

The Twenty-third United States Census, known as Census 2010 or the 2010 Census, is the current national census of the United States. National Census Day was April 1, 2010 and is the reference date used in enumerating individuals...

; making the population for the immediate, urban Plattsburgh, New York Region

Plattsburgh, New York (disambiguation)

Plattsburgh, New York refers to two locations in Clinton County in the U.S. state of New York:* Plattsburgh , New York* Plattsburgh , New York...

 31,859.

The city of Plattsburgh is located entirely within the original boundaries of the town of Plattsburgh

Plattsburgh (town), New York

Plattsburgh is a town in Clinton County, New York, United States. The population was 11,870 at the 2010 census. The town is named after Zephaniah Platt, an early land owner.The Town of Plattsburgh borders the City of Plattsburgh...

 and is in the North Country

North Country, New York

The North Country is a region of the U.S. state of New York that encompasses the state's extreme northern frontier, bordering Lake Ontario on the west, the Saint Lawrence River and the Canadian provinces of Ontario and Quebec on the north and northwest, and Lake Champlain and Vermont on the east...

 region of the northeastern part of the state.
The City of Plattsburgh is the population center and county seat at the heart of the Plattsburgh Micropolitan Statistical Area (MSA) - population 82,128 as of the 2010 Census.