ZIP code · Holtsville · New York · United States
ZIP code 11742 — Holtsville
ZIP code 11742 serves Holtsville, New York.
- Postal code
- 11742Single source Value from one source, not cross-checked.
- City
- Holtsville
- County
- Suffolk FIPS 36103
- State
- New York
- Country
- United States
- Coordinates
- 40.8105, -73.0416 — precision precise (locality)
View on OpenStreetMap - Population
- 13,194 (ZCTA, ACS 5-year)
- Population density
- 2,562 / sq mi
- Land area
- 5.2 sq mi (13.3 km²) (ZCTA, ACS 5-year)
- Median household income
- $126,563
- Per-capita income
- $52,061
- Median age
- 40
- Households
- 4,508
- Housing units
- 4,610
- Median home value
- $475,600
- Median gross rent
- $2,224 / month
- Congressional districts
- NY-2 (also NY-1) (119th Congress)
- USDA hardiness zone
- 7b (5 to 10 °F)Planting / growing zone from the 2023 USDA Plant Hardiness Zone Map: average annual extreme minimum temperature, 1991–2020.
- Time zone
- America/New_York (UTC−5 / UTC−4 DST)
Tools: compare 11742 with another ZIP · ZIPs within 25 miles · distance from 11742
Map of ZIP code 11742
Climate — monthly normals
Warmest month Jul (avg high 83°F), coldest Jan (avg low 25°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 39 | 41 | 48 | 58 | 68 | 77 | 83 | 81 | 75 | 64 | 54 | 44 |
| Avg low °F | 25 | 26 | 32 | 41 | 51 | 61 | 67 | 66 | 59 | 47 | 38 | 30 |
| Precip in | 3.7 | 3.3 | 4.5 | 4.1 | 3.3 | 4.0 | 3.3 | 4.2 | 3.6 | 4.0 | 3.4 | 4.7 |
NOAA 1991–2020 climate normals from the nearest station: ISLIP LI MACARTHUR AP (3.4 mi) · NOAA NCEI
Places in ZIP 11742
- 4 schools
- 5 restaurants & cafés
- 12 parks
- 6 playgrounds
- 1 gyms & sports centres
- 1 post offices
- 1 places of worship
- 4 gas stations
- 2 police & fire stations
Places mapped inside this ZIP’s ZCTA area in OpenStreetMap. OSM is community-maintained: counts reflect what has been mapped, and completeness varies by area — treat them as at-least figures. © OpenStreetMap contributors (ODbL) · Methodology
About this page
US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.
GeoNames · U.S. Census Bureau (ACS) · U.S. Census Bureau · NOAA NCEI · usda-phzm. Data generated on 2026-08-21. Methodology · Report an error on this page