Smithtown is a hamlet (and census-designated place

Census-designated place

A census-designated place is a concentration of population identified by the United States Census Bureau for statistical purposes. CDPs are delineated for each decennial census as the statistical counterparts of incorporated places such as cities, towns and villages...

 (CDP) ) in Suffolk County

Suffolk County, New York

Suffolk County is a county located in the U.S. state of New York on the eastern portion of Long Island. As of the 2010 census, the population was 1,493,350. It was named for the county of Suffolk in England, from which its earliest settlers came...

, New York

New York

New York is a state in the Northeastern region of the United States. It is the nation's third most populous state. New York is bordered by New Jersey and Pennsylvania to the south, and by Connecticut, Massachusetts and Vermont to the east...

, USA. The population was 26,901 at the 2000 census.

The community of Smithtown is in the Town of Smithtown

Smithtown, New York

As of the census of 2000, there were 115,715 people, 38,487 households, and 31,482 families residing in the town. The population density was 2,159.9 people per square mile . There were 39,357 housing units at an average density of 734.6 per square mile...

.
The CDP or hamlet of Smithtown is located at 40° 51' 21" North, 73° 12' 53" West (40.855794, -73.214607).

According to the United States Census Bureau

United States Census Bureau

The United States Census Bureau is the government agency that is responsible for the United States Census. It also gathers other national demographic and economic data...

, the CDP has a total area of 12.4 square miles (32.0 km²), of which, 11.9 square miles (30.7 km²) of it is land and 0.5 square miles (1.3 km²) of it (3.96%) is water.
As of the census

Census

A census is the procedure of systematically acquiring and recording information about the members of a given population. It is a regularly occurring and official count of a particular population. The term is used mostly in connection with national population and housing censuses; other common...

 of 2000, there were 26,901 people, 8,815 households, and 7,245 families residing in the CDP.