11766 ZIP Code, Mount Sinai, NY
11766 is a ZIP code in Mount Sinai, New York in Suffolk County. It covers 6.0 square miles of land. The closest ZIP codes are 11776, 11764 and 11777. 10,750 people live here in 3,934 households. At about 1,784 people per square mile it has suburban density, and most homes are owner-occupied (93%). Median household income is $153,235, well above the New York median of $85,974; the median age is 49.0, older than most ZIP codes.
Quick facts
- Mailing city: Mount Sinai, NY
- County: Suffolk County
- Land area: 6.0 sq mi
- Population: 10,750
- Median household income: $153,235
- Carrier routes: 10 (4,656 homes)
Key figures
| Measure | Value |
|---|---|
| Residents | 10,750 |
| Households | 3,934 |
| Median household income | $153,235 |
| Income per person | $65,939 |
| Median age | 49 |
| Homeowners | 92.5% |
| Median home value | $649,600 |
| Median rent | $3,088 |
| Bachelor's degree or higher | 50.3% |
| Average commute (minutes) | 35.8 |
| Households with kids under 18 | 27.9% |
| Moved in the past year | 6.9% |
| Below the poverty line | 2.1% |
| Broadband internet | 96.3% |
| Speak a non-English language at home | 10.9% |
Household income
| % of households | Value |
|---|---|
| <$10K | 1.4% |
| $10–15K | 0.8% |
| $15–25K | 0.9% |
| $25–35K | 2.6% |
| $35–50K | 7.9% |
| $50–75K | 12.1% |
| $75–100K | 4.0% |
| $100–150K | 18.6% |
| $150–200K | 14.8% |
| $200K+ | 36.9% |
Age
| % of all residents | Value |
|---|---|
| <10 | 8.2% |
| 10–19 | 13.7% |
| 20–24 | 4.4% |
| 25–34 | 6.8% |
| 35–44 | 11.6% |
| 45–54 | 15.0% |
| 55–64 | 11.9% |
| 65–74 | 15.6% |
| 75+ | 12.8% |
Tenure
| % of housing units | Value |
|---|---|
| Owned, with mortgage | 50.9% |
| Owned outright | 37.5% |
| Rented | 7.0% |
| Vacant | 4.6% |
Type of building
| % of housing units | Value |
|---|---|
| Detached house | 80.6% |
| Townhome | 10.3% |
| 2–4 units | 3.6% |
| 5–19 units | 2.9% |
| 20+ units | 2.7% |
| Mobile / other | 0.0% |
Businesses in 11766
345 business establishments with 1,814 employees (ZIP Codes Business Patterns 2023).
- Construction: 52
- Professional, Scientific, and Technical Services: 50
- Retail Trade: 40
- Other Services (except Public Administration): 40
- Health Care and Social Assistance: 35
- Accommodation and Food Services: 30
- Administrative and Support and Waste Management and Remediation Services: 27
- Wholesale Trade: 21
EDDM carrier routes
11766 has 10 USPS carrier routes with 4,656 residential and 214 business mailboxes. Open the EDDM route map.
Carrier routes in 11766
11766 has 10 USPS carrier routes (2 city (C), 8 rural (R)) with 4,656 residential and 214 business mailboxes. Routes range from 142 homes (C011) to 861 homes (R001); the median route has 457 homes. The Census counted 3,934 households in 11766 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.
| Homes per route | Routes |
|---|---|
| 1–249 | 2 |
| 250–499 | 6 |
| 500–749 | 1 |
| 750–999 | 1 |
| 1,000–1,499 | 0 |
| 1,500+ | 0 |
Best routes in 11766 for…
Most businesses
For B2B offers: office supplies, cleaning, IT, catering and commercial services.
- Route R008 — USPS business mailboxes 145, 245 homes
- Route R006 — USPS business mailboxes 18, 465 homes
- Route R005 — USPS business mailboxes 17, 449 homes
- Route R007 — USPS business mailboxes 17, 427 homes
- Route R002 — USPS business mailboxes 6, 483 homes
Select these 5 routes on the route map
Every carrier route in 11766
| Route | Type | Homes | Businesses | Est. median income | Est. owners | Est. families with kids | Est. moved in past year |
|---|---|---|---|---|---|---|---|
| C010 | City | 655 | 3 | $99,323 | — | — | — |
| C011 | City | 142 | 2 | $99,323 | — | — | — |
| R001 | Rural | 861 | 4 | $162,588 | — | — | — |
| R002 | Rural | 483 | 6 | $142,618 | — | — | — |
| R003 | Rural | 496 | 2 | $99,323 | — | — | — |
| R004 | Rural | 433 | 0 | $160,267 | — | — | — |
| R005 | Rural | 449 | 17 | $183,846 | — | — | — |
| R006 | Rural | 465 | 18 | $183,846 | — | — | — |
| R007 | Rural | 427 | 17 | $76,354 | — | — | — |
| R008 | Rural | 245 | 145 | $166,906 | — | — | — |
Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 11766 on the EDDM route map.
How route demographics are estimated
Mailbox counts come from USPS; demographics are estimates
The number of homes and businesses on each carrier route is the current USPS EDDM count. The Census Bureau does not publish figures for carrier routes, so income, homeownership, ages, families, movers and housing age on a route are EDDM2GO estimates built from Census block groups (neighborhood areas of roughly 600 to 3,000 people).
How a route gets its figures: the block-group length-share method
We trace each route's streets every 25 meters and record which block group each stretch falls in. The route's homes are spread along its streets in proportion to length, so a route with 60% of its street length in one block group is assumed to have 60% of its homes there. Each block group then contributes its Census counts in proportion to the share of its housing units that sit on the route (capped at the whole block group). Medians are recalculated from the combined income, home-value and age brackets, the way the Census Bureau computes them, not averaged.
Margins of error
Census survey figures carry a margin of error at 90% confidence; we carry it through the calculation and show it as ±. Our margins treat the route-to-block-group split as exact, so the real uncertainty is larger. Routes with fewer than 100 estimated households, large margins, or streets we could not place are flagged.
Different years
USPS mailbox counts are current. Census figures are 5-year averages for 2020–2024, so a new subdivision may have more homes on the route today than the Census counted. Use the route figures to compare routes with each other, not as an exact head count.
Why some routes show identical figures
Two routes that run through the same block group get the same percentages and medians, because the Census publishes one set of figures for the whole block group. Their mailbox counts still differ, and those are exact.
Route and mailbox counts: USPS EDDM route data. Route demographics: EDDM2GO estimates from U.S. Census Bureau American Community Survey 5-year block-group data (2020–2024) and 2024 cartographic block-group boundaries. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.
Nearby ZIP codes
- 11776 — Terryville CDP, NY (2.3 mi)
- 11764 — Miller Place CDP, NY (2.5 mi)
- 11777 — Port Jefferson village, NY (2.8 mi)
- 11789 — Sound Beach CDP, NY (2.9 mi)
- 11727 — Coram CDP, NY (4.2 mi)
- 11778 — Rocky Point CDP, NY (4.3 mi)
- 11953 — Middle Island CDP, NY (4.8 mi)
- 11733 — East Setauket CDP, NY (4.9 mi)
Areas that include 11766
- Mount Sinai, NY ZIP codes — 1 ZIP code
- Suffolk County ZIP codes — 108 ZIP codes
- New York ZIP code data
Where it ranks
- No. 21 of 88: highest median household income in Suffolk County
- No. 18 of 88: highest share of owner-occupied homes in Suffolk County
- No. 18 of 88: highest median age in Suffolk County
Mail every home in 11766
Route counts on this page price as Full Service 6.5 × 9 postcards: we print, bundle by carrier route and hand the mailing to USPS. Prefer to take it to the Post Office yourself? Print only costs less and you pay postage at drop-off.
EDDM guides
ZIP code statistics describe the Census ZIP Code Tabulation Area (ZCTA) 11766, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.
Frequently asked questions
- What city is 11766 in?
- 11766 is a Mount Sinai, NY mailing address. By land area, 95% lies inside Mount Sinai, 4% lies inside Coram and 1% lies inside Miller Place.
- What county is 11766 in?
- 11766 is in Suffolk County.
- What is the population of 11766?
- About 10,750 people (±1,200), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 11,888.
- What is the median household income in 11766?
- $153,235 (±$19,761), compared with $85,974 for New York as a whole. Half the households in the ZIP code earn more and half earn less.
- How many carrier routes and mailboxes are in 11766?
- 10 USPS carrier routes with 4,656 residential and 214 business mailboxes (4,870 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
- What ZIP codes are near 11766?
- The closest, measured center to center: 11776 (2.3 mi, Terryville), 11764 (2.5 mi, Miller Place), 11777 (2.8 mi, Port Jefferson), 11789 (2.9 mi, Sound Beach), 11727 (4.2 mi, Coram) and 11778 (4.3 mi, Rocky Point).
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.