Home > NY > Suffolk County > Holtsville > Zip 11742

Zip Code 11742 — Holtsville, NY

ZIP Code 11742 is associated with Holtsville, NY, in Suffolk County. The listed population estimate is 13,202; estimated density is 989.9 people per square mile. Among records with population estimates, it ranks #45 of 106 in Suffolk County and #441 of 1,778 in NY.
Page generated: 2026-10-08. This is not the source data release date.

📍 View location on OpenStreetMap (40.810340, -73.041900)

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

How 11742 Compares

MetricZIP 11742Suffolk County recordsNY records
Population estimate13,2021,476,044 (sum)19,771,902 (sum)
Population Density989.9 /sq mi----
County population rank#45 of 106----
State population rank#441 of 1,778----

Regional sums combine the population estimates in the listed ZIP records; they are not official county or state population totals.

Explore More ZIP Codes

Nearby ZIP Codes in NY

ZIP CodeCityDistancePopulation estimate
ZIP 11741Holbrook1.8 mi26,667
ZIP 11738Farmingville1.9 mi18,877
ZIP 11763Medford3.3 mi29,973
ZIP 11779Ronkonkoma3.9 mi38,206
ZIP 11784Selden4.0 mi26,244

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 →