Yaphank, New York

Yaphank, New York
The historic Swezey-Avey House on the southeast bank of Upper Yaphank Lake
U.S. Census map
Yaphank
Location within the state of New York
Yaphank
Yaphank (New York)
Coordinates: 40°50′7″N 72°55′45″W / 40.83528°N 72.92917°W / 40.83528; -72.92917
CountryUnited States
StateNew York
CountySuffolk
Area
 • Total
13.8 sq mi (35.7 km2)
 • Land13.7 sq mi (35.4 km2)
 • Water0.12 sq mi (0.3 km2)
Elevation
43 ft (13 m)
Population
 (2020)
 • Total
5,974
 • Density437/sq mi (169/km2)
Time zoneUTC−05:00 (Eastern (EST))
 • Summer (DST)UTC−04:00 (EDT)
ZIP Code
11980
Area codes631, 934
FIPS code36-83426
GNIS feature ID0971807

Yaphank (/ˈjæpæŋk/) is a hamlet and census-designated place (CDP) in Suffolk County, New York, United States. As of the 2020 census, Yaphank had a population of 5,974.

Yaphank is located in the south part of the Town of Brookhaven. It is served by the Longwood Central School District, except for extreme southwestern Yaphank, which is served by the South Country Central School District.

In the 1930s, Yaphank was a center of American Nazism where Camp Siegfried drew up to a thousand weekly visitors from New York City for pro-Nazi rallies and vacationing.