Holtsville, New York Zip Codes
📍 Holtsville is in Suffolk County, New York with 3 zip codes; the most populous is 11742.
Holtsville is a USPS city name in Suffolk County, New York with a Census population of approximately 13,194 across its ZIP codes. Suffolk County as a whole has 117 ZIP codes in this directory. Below you'll find every zip code serving Holtsville with population, income and home value, a map, and the city's affordability profile.
Population and demographic data sourced from the U.S. Census Bureau American Community Survey (ACS) 5-Year Estimates. ZIP code routing data sourced from the United States Postal Service (USPS).
All Holtsville Zip Codes
Holtsville at a Glance
Holtsville has 3 ZIP codes in this directory: 1 standard delivery ZIP and 2 PO Box or unique ZIPs that carry no resident population in Census data. Its one ZIP with published Census housing data, 11742, has 13,194 residents.
Holtsville's ZIP has a household income of $126,563 and a home value of $475,600, a price-to-income ratio of 3.8, above the 2.9 New York ZIP median. Median rent across these ZIPs is $2,224 a month.
82% of households in Holtsville own their home (statewide ZIP median 80%). 35% of adults hold a bachelor's degree, above the 31% statewide median. The median poverty rate is 4.5%, far below the 9.9% statewide ZIP median. Overall density is about 2,587 residents per square mile across 5 square miles of ZIP land area.
Medians are taken across the ZIP codes listed below (each ZIP weighted equally); PO Box and no-data ZIPs are excluded. Definitions on the methodology page; statewide comparisons in the 2026 New York ZIP Code Affordability Report.
Holtsville Zip Code Map
Interactive map of Holtsville, New York zip codes. Click any marker for details.