Home > NY > Suffolk County > Holtsville > Zip 11742

Zip Code 11742 — Holtsville, NY

11742 is a ZIP Code associated with Holtsville, NY, located within Suffolk. The postal region supports an estimated population of 13,202 residents across Data Pending housing units, with a population density of 989.9 people per square mile.
WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (40.810340, -73.041900)

Data MetricLocal Statistic
Postal / Zip Code11742
Primary CityHoltsville
State / ProvinceNY
CountySuffolk
Total Population13,202
Median Household IncomeData Pending
Total Housing UnitsData Pending
Population Density989.9 people/sq mi
TimezoneAmerica/New_York

How 11742 Compares

MetricZIP 11742Suffolk CountyNY State Average
Population13,2021,476,04419,771,902
Median IncomeData PendingN/AN/A
Population Density989.9 /sq mi----

Nearby ZIP Codes

ZIP CodeCityDistancePopulationMedian Income
Zip 11741Holbrook1.8 mi26,667N/A
Zip 11738Farmingville1.9 mi18,877N/A
Zip 11763Medford3.3 mi29,973N/A
Zip 11779Ronkonkoma3.9 mi38,206N/A
Zip 11784Selden4.0 mi26,244N/A

Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →