Residential delivery area · New York
ZIP Code 11742: Holtsville, NY
ZIP code 11742 is in Holtsville, New York, entirely in Suffolk County (Census 2020 ZIP-county file). About 13,000 people live there (Census Bureau, ACS 2020-2024). Median household income is $125,162 (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Holtsville · its only residential ZIP
- County
- Suffolk County
- Census places
- Holtsville census-designated place
- Metro area
- New York-Newark-Jersey City, NY-NJ
- House districts
- NY-2 (71%), NY-1 (29%) 119th Congress, by share of land
- State
- New York
- Time zone
- Eastern
- Land area
- 5.1 sq mi · 2,564 people per sq mi
Where is ZIP code 11742?
11742 centers on 40.810°, -73.042° and covers 5.1 square miles of land. It borders 5 ZIP codes: 11741, 11738, 11763, 11779, 11772.
The map draws ZIP code areas only. For the streets inside 11742, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).
How does 11742 compare with the rest of Suffolk County?
| Measure | 11742 | In Suffolk County | In NY |
|---|---|---|---|
| People (ACS 2020-2024) | 13,202 | 45th of 108 | 441st of 1,826 |
| Median household income | $125k | 54th of 81 | 209th of 1,081 |
| Median home value | $510k | 63rd of 88 | 343rd of 1,172 |
Its median household income is higher than in 92% of U.S. residential ZIP codes, and it is denser than 87% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 11742?
The 2020 Census counted 12,699 people in 11742; the ACS, which samples households over 2020-2024, estimates 13,202. Between the 2010 and 2020 censuses its population fell 4.2% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 13,202
- 2020 Census count
- 12,699−4.2% since 2010 (13,261)
- Households
- 4,651
- Median age
- 39.3
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 11742?
Of the 13,202 people the ACS estimates in 11742, 20.5% are under 18 and 13.8% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (72.9%), then Hispanic or Latino (16.8%).
- Under 1820.5%
- 18 to 6465.7%
- 65 and older13.8%
- White, not Hispanic72.9%
- Hispanic or Latino16.8%
- Black, not Hispanic4.1%
- Other or two or more3.7%
- Asian, not Hispanic2.5%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 11742 earn?
Median household income is $125,162 (ACS 2020-2024), the 54th highest of the 81 ranked ZIP codes in Suffolk County. It is not measurably different from 2015-2019 ($131,357 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $125,162±$14,187
- Income per person
- $55,928
- Below the poverty line
- 5.6%
- Unemployed (of the labor force)
- 3.1%
- Adults 25+ with a bachelor's degree
- 36.1%
- Adjusted gross income per tax return, 2022
- $94,8036,970 returns; wages 76% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 11742?
FHFA's house price index for 11742, built from repeat sales and appraisals of the same homes, rose 88% from 2015 to 2025 and rose 53% from 2020 to 2025, and moved +2.3% in 2025.
- Median home value (owners' estimate)
- $510,200
- Median gross rent
- $2,400
- Homes owned by their occupants
- 83.6%
- Housing units
- 4,725
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 11742?
345 business establishments had a location in this ZIP code in 2023, 19 more than in 2018; the most are in construction (ZIP Code Business Patterns).
- Construction80
- Professional, scientific, and technical services40
- Wholesale trade33
- Other services (except public administration)30
- Retail trade29
- Health care and social assistance28
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 11742?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 11741 | Holbrook | 26,667 | $144k | 1.8 mi |
| 11738 | Farmingville | 18,877 | $140k | 1.9 mi |
| 11763 | Medford | 29,973 | $121k | 3.3 mi |
| 11779 | Ronkonkoma | 38,206 | $112k | 3.8 mi |
| 11772 | Patchogue | 45,023 | $105k | 4.4 mi |
| 11784 | Selden | 26,244 | $104k | 4.0 mi (near) |
| 11715 | Blue Point | 3,936 | $163k | 4.1 mi (near) |
| 11720 | Centereach | 29,292 | $135k | 4.6 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.
Which other ZIP codes use the name Holtsville?
2 more ZIP codes carry the postal name Holtsville, NY without a residential delivery area: PO boxes at the post office, or a single organization with its own ZIP code. The Census Bureau publishes no figures for them.
| ZIP | County |
|---|---|
| 00501 | Suffolk County |
| 00544 | Suffolk County |
Source: GeoNames postal codes (CC BY 4.0), downloaded 2026-10-09; a ZIP code with no Census ZCTA has no residential delivery area.