11780 ZIP Code, Saint James, NY

11780 is a ZIP code in Saint James, New York in Suffolk County. It covers 12 square miles of land. The closest ZIP codes are 11790, 11794 and 11733. 15,018 people live here in 5,459 households. At about 1,306 people per square mile it has suburban density, and most homes are owner-occupied (87%). Median household income is $144,577, well above the New York median of $85,974; the median age is 47.4, older than most ZIP codes.

Quick facts

Key figures

MeasureValue
Residents15,018
Households5,459
Median household income$144,577
Income per person$75,677
Median age47.4
Homeowners87.4%
Median home value$723,200
Median rent$2,316
Bachelor's degree or higher52.1%
Average commute (minutes)30.7
Households with kids under 1829.5%
Moved in the past year6.9%
Below the poverty line3.2%
Broadband internet93.3%
Speak a non-English language at home13.1%

Household income

% of householdsValue
<$10K2.2%
$10–15K0.8%
$15–25K2.2%
$25–35K2.4%
$35–50K5.3%
$50–75K9.0%
$75–100K9.3%
$100–150K20.8%
$150–200K11.4%
$200K+36.6%

Age

% of all residentsValue
<107.4%
10–1914.1%
20–246.2%
25–3410.2%
35–449.3%
45–5413.8%
55–6416.4%
65–7412.3%
75+10.2%

Tenure

% of housing unitsValue
Owned, with mortgage48.4%
Owned outright34.5%
Rented11.5%
Vacant5.6%

Type of building

% of housing unitsValue
Detached house77.2%
Townhome10.9%
2–4 units3.9%
5–19 units7.5%
20+ units0.5%
Mobile / other0.0%

Businesses in 11780

557 business establishments with 6,761 employees (ZIP Codes Business Patterns 2023).

EDDM carrier routes

11780 has 17 USPS carrier routes with 5,605 residential and 454 business mailboxes. Open the EDDM route map.

Carrier routes in 11780

11780 has 17 USPS carrier routes (15 city (C), 2 rural (R)) with 5,605 residential and 454 business mailboxes. Routes range from 201 homes (C004) to 463 homes (C014); the median route has 333 homes. The Census counted 5,459 households in 11780 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per routeRoutes
1–2491
250–49916
500–7490
750–9990
1,000–1,4990
1,500+0

Best routes in 11780 for…

Most businesses

For B2B offers: office supplies, cleaning, IT, catering and commercial services.

  1. Route C006 — USPS business mailboxes 120, 268 homes
  2. Route C010 — USPS business mailboxes 95, 280 homes
  3. Route C004 — USPS business mailboxes 79, 201 homes
  4. Route C012 — USPS business mailboxes 73, 305 homes
  5. Route C013 — USPS business mailboxes 32, 311 homes

Select these 5 routes on the route map

Every carrier route in 11780

RouteTypeHomesBusinessesEst. median incomeEst. ownersEst. families with kidsEst. moved in past year
C001City3334$178,371———
C002City3681$132,754———
C003City3701$178,371———
C004City20179$149,123———
C005City3588$200,001+———
C006City268120$200,001+———
C007City3301$167,762———
C008City30430$149,123———
C010City28095$171,227———
C011City2520$149,123———
C012City30573$121,427———
C013City31132$200,001+———
C014City4632$178,371———
C015City3750$200,001+———
C016City3492$132,754———
R001Rural3806$167,762———
R002Rural3580$200,001+———

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 11780 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

Areas that include 11780

Where it ranks

Mail every home in 11780

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) 11780, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 11780 in?
11780 is a Saint James, NY mailing address. By land area, 35% lies inside St. James, 33% lies inside Nissequogue, 22% lies inside Head of the Harbor and 7% lies inside Smithtown; the rest is outside any Census-defined city or community.
What county is 11780 in?
11780 is in Suffolk County.
What is the population of 11780?
About 15,018 people (±960), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 15,508.
What is the median household income in 11780?
$144,577 (±$17,398), 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 11780?
17 USPS carrier routes with 5,605 residential and 454 business mailboxes (6,059 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 11780?
The closest, measured center to center: 11790 (2.4 mi, Stony Brook), 11794 (2.5 mi, Stony Brook University), 11733 (3.7 mi, East Setauket), 11754 (4.4 mi, Kings Park), 11787 (4.5 mi, Smithtown) and 11767 (4.6 mi, Nesconset).

This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.