Holtsville, New York

Holtsville is a hamlet and census-designated place (CDP) in Suffolk County, on Long Island, in New York, United States. The population was 19,714 at the 2010 census.

Holtsville, New York
The Holtsville Post Office in 2018.
U.S. Census map of Holtsville
Holtsville, New York
Location within the state of New York
Holtsville, New York
Holtsville, New York (New York)
Coordinates: 40°48′48″N 73°2′50″W
Country United States
State New York
CountySuffolk
TownsBrookhaven
Islip
Area
  Total7.11 sq mi (18.41 km2)
  Land7.11 sq mi (18.41 km2)
  Water0.00 sq mi (0.00 km2)
Elevation
105 ft (32 m)
Population
 (2020)
  Total18,937
  Density2,663.81/sq mi (1,028.53/km2)
Time zoneUTC−05:00 (Eastern Time Zone)
  Summer (DST)UTC−04:00
ZIP Codes
00501, 00544, 11742
Area code(s)631, 934
FIPS code36-35254
GNIS feature ID0953030

The hamlet is mainly in the Town of Brookhaven, while the southwestern portion is in the Town of Islip. An IRS Processing Center is located in Holtsville, along with NYPA's Richard M. Flynn Power Plant.

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