Residential delivery area · New York
ZIP Code 11724: Cold Spring Harbor, NY
ZIP code 11724 is in Cold Spring Harbor, New York, entirely in Suffolk County (Census 2020 ZIP-county file). About 3,100 people live there (Census Bureau, ACS 2020-2024). Median household income is $250,000 or more (Census Bureau, ACS 2020-2024). By Census place, its land lies in Cold Spring Harbor (85%) and Lloyd Harbor (14%), and 1% in smaller places.
- ACS2020-24
- Census2020
- FHFA2023
- ZBP2023
- IRS2022
- Town
- Cold Spring Harbor · its only residential ZIP
- County
- Suffolk County
- Census places
- Cold Spring Harbor (85%) census-designated place; Lloyd Harbor (14%)
- Metro area
- New York-Newark-Jersey City, NY-NJ
- House district
- NY-3 119th Congress
- State
- New York
- Time zone
- Eastern
- Land area
- 3.9 sq mi · 796 people per sq mi
Where is ZIP code 11724?
11724 centers on 40.864°, -73.456° and covers 3.9 square miles of land plus 0.5 of water. It borders 3 ZIP codes: 11743, 11797, 11791.
The map draws ZIP code areas only. For the streets inside 11724, 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 11724 compare with the rest of Suffolk County?
| Measure | 11724 | In Suffolk County | In NY |
|---|---|---|---|
| People (ACS 2020-2024) | 3,073 | 79th of 108 | 881st of 1,826 |
| Median household income | $250k+ | 1st of 81 | 1= of 1,081 |
| Median home value | $1.64M | 2nd of 88 | 11th of 1,172 |
1= means a shared first place: 11724's median household income ties with 15 other ZIP codes at the Census cap in New York.
Its median household income is at the Census cap of $250,000 or more, like 117 other U.S. residential ZIP codes (69 of the 118 are large enough to rank), and it is denser than 76% 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 11724?
The 2020 Census counted 3,268 people in 11724; the ACS, which samples households over 2020-2024, estimates 3,073. Between the 2010 and 2020 censuses its population grew 1.5% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 3,073±425 (90% margin)
- 2020 Census count
- 3,268+1.5% since 2010 (3,220)
- Households
- 1,017
- Median age
- 41.5
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 11724?
Of the 3,073 people the ACS estimates in 11724, 29.4% are under 18 and 14.4% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (86.6%).
- Under 1829.4%
- 18 to 6456.2%
- 65 and older14.4%
- White, not Hispanic86.6%
- Other or two or more5.9%
- Asian, not Hispanic4.5%
- Hispanic or Latino2.6%
- Black, not Hispanic0.4%
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 11724 earn?
Median household income is $250,000 or more (ACS 2020-2024), the highest of the 81 ranked ZIP codes in Suffolk County.
- Median household income
- $250,000 or more
- Income per person
- $112,377
- Below the poverty line
- 2.3%
- Unemployed (of the labor force)
- 1.0%
- Adults 25+ with a bachelor's degree
- 79.4%
- Adjusted gross income per tax return, 2022
- $511,8911,610 returns; wages 47% 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 11724?
- Median home value (owners' estimate)
- $1,641,000
- Median gross rent
- –
- Homes owned by their occupants
- 92.7%
- Housing units
- 1,068
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 11724?
131 business establishments had a location in this ZIP code in 2023, 11 more than in 2018; the most are in professional, scientific, and technical services (ZIP Code Business Patterns).
- Professional, scientific, and technical services21
- Construction19
- Retail trade12
- Real estate and rental and leasing12
- Other services (except public administration)12
- Health care and social assistance11
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 11724?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 11743 | Huntington | 43,490 | $183k | 2.2 mi |
| 11797 | Woodbury | 9,402 | $193k | 3.2 mi |
| 11791 | Syosset | 25,520 | $203k | 3.5 mi |
| 11771 | Oyster Bay | 10,908 | $158k | 3.7 mi (near) |
| 11732 | East Norwich | 3,228 | $149k | 4.6 mi (near) |
| 11740 | Greenlawn | 10,127 | $152k | 5.0 mi (near) |
| 11721 | Centerport | 6,426 | $197k | 5.2 mi (near) |
| 11765 | Mill Neck | 683 | $197k | 5.5 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.