Residential delivery area · New York
ZIP Code 11766: Mount Sinai, NY
ZIP code 11766 is in Mount Sinai, New York, entirely in Suffolk County (Census 2020 ZIP-county file). About 11,000 people live there (Census Bureau, ACS 2020-2024). Median household income is $153,235 (Census Bureau, ACS 2020-2024). By Census place, 95% of its land lies in Mount Sinai (a census-designated place), and 5% in smaller places.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Mount Sinai · its only residential ZIP
- County
- Suffolk County
- Census places
- Mount Sinai census-designated place
- Metro area
- New York-Newark-Jersey City, NY-NJ
- House district
- NY-1 119th Congress
- State
- New York
- Time zone
- Eastern
- Land area
- 6.0 sq mi · 1,784 people per sq mi
Where is ZIP code 11766?
11766 centers on 40.939°, -73.019° and covers 6.0 square miles of land plus 1.4 of water. It borders 5 ZIP codes: 11776, 11764, 11777, 11727, 11953.
The map draws ZIP code areas only. For the streets inside 11766, 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 11766 compare with the rest of Suffolk County?
| Measure | 11766 | In Suffolk County | In NY |
|---|---|---|---|
| People (ACS 2020-2024) | 10,750 | 51st of 108 | 497th of 1,826 |
| Median household income | $153k | 19th of 81 | 96th of 1,081 |
| Median home value | $650k | 35th of 88 | 247th of 1,172 |
Its median household income is higher than in 97% of U.S. residential ZIP codes, and it is denser than 84% 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 11766?
The 2020 Census counted 11,888 people in 11766; the ACS, which samples households over 2020-2024, estimates 10,750. Between the 2010 and 2020 censuses its population fell 5.9% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 10,750±1,200 (90% margin)
- 2020 Census count
- 11,888−5.9% since 2010 (12,635)
- Households
- 3,934
- Median age
- 49.0
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 11766?
Of the 10,750 people the ACS estimates in 11766, 20.7% are under 18 and 28.4% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (80.8%), then Hispanic or Latino (11.3%).
- Under 1820.7%
- 18 to 6450.9%
- 65 and older28.4%
- White, not Hispanic80.8%
- Hispanic or Latino11.3%
- Asian, not Hispanic3.2%
- Other or two or more2.8%
- Black, not Hispanic1.9%
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 11766 earn?
Median household income is $153,235 (ACS 2020-2024), the 19th highest of the 81 ranked ZIP codes in Suffolk County. It is not measurably different from 2015-2019 ($163,251 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $153,235±$19,761
- Income per person
- $65,939
- Below the poverty line
- 2.1%
- Unemployed (of the labor force)
- 2.4%
- Adults 25+ with a bachelor's degree
- 50.3%
- Adjusted gross income per tax return, 2022
- $146,2016,630 returns; wages 58% 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 11766?
FHFA's house price index for 11766, built from repeat sales and appraisals of the same homes, rose 81% from 2015 to 2025 and rose 53% from 2020 to 2025, and moved +7.1% in 2025.
- Median home value (owners' estimate)
- $649,600
- Median gross rent
- $3,088
- Homes owned by their occupants
- 92.5%
- Housing units
- 4,130
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 11766?
345 business establishments had a location in this ZIP code in 2023, 13 fewer than in 2018; the most are in construction (ZIP Code Business Patterns).
- Construction52
- Professional, scientific, and technical services50
- Retail trade40
- Other services (except public administration)40
- Health care and social assistance35
- Accommodation and food services30
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 11766?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 11776 | Port Jefferson Station | 22,808 | $121k | 2.3 mi |
| 11764 | Miller Place | 12,551 | $147k | 2.5 mi |
| 11777 | Port Jefferson | 9,396 | $151k | 2.8 mi |
| 11727 | Coram | 28,495 | $103k | 4.2 mi |
| 11953 | Middle Island | 12,846 | $86k | 4.8 mi |
| 11789 | Sound Beach | 7,369 | $132k | 2.9 mi (near) |
| 11778 | Rocky Point | 12,390 | $126k | 4.3 mi (near) |
| 11733 | East Setauket | 17,752 | $173k | 4.9 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.