What city is 11731 in?

11731 is a East Northport, NY mailing address. By land area, 47% lies inside East Northport, 25% lies inside Elwood, 23% lies inside Commack and 5% lies inside Dix Hills.

What is the population of 11731?

About 29,999 people (±1,808), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 30,353.

What is the median household income in 11731?

$161,132 (±$8,834), 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 11731?

25 USPS carrier routes with 10,284 residential and 573 business mailboxes (10,857 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.

What ZIP codes are near 11731?

The closest, measured center to center: 11740 (2.3 mi, Greenlawn), 11725 (2.4 mi, Commack), 11754 (3.8 mi, Kings Park), 11721 (4 mi, Centerport), 11746 (4.1 mi, Dix Hills) and 11768 (4.4 mi, Fort Salonga).

11731 ZIP Code, East Northport, NY

11731 is a ZIP code in East Northport, New York in Suffolk County. It covers 8.3 square miles of land. The closest ZIP codes are 11740, 11725 and 11754. 29,999 people live here in 10,811 households. At about 3,605 people per square mile it has suburban density, and most homes are owner-occupied (90%). Median household income is $161,132, well above the New York median of $85,974; the median age is 46.2, older than most ZIP codes.

Quick facts

Mailing city: East Northport, NY
County: Suffolk County
Land area: 8.3 sq mi
Population: 29,999
Median household income: $161,132
Carrier routes: 25 (10,284 homes)

Key figures

Measure	Value
Residents	29,999
Households	10,811
Median household income	$161,132
Income per person	$67,081
Median age	46.2
Homeowners	90.4%
Median home value	$646,600
Median rent	$2,412
Bachelor's degree or higher	53.2%
Average commute (minutes)	35.9
Households with kids under 18	27.9%
Moved in the past year	3.9%
Below the poverty line	6.0%
Broadband internet	95.5%
Speak a non-English language at home	11.3%

Household income

% of households	Value
<$10K	3.0%
$10–15K	1.4%
$15–25K	2.9%
$25–35K	1.9%
$35–50K	4.0%
$50–75K	8.6%
$75–100K	5.7%
$100–150K	15.6%
$150–200K	24.3%
$200K+	32.6%

Age

% of all residents	Value
<10	12.1%
10–19	9.9%
20–24	5.9%
25–34	11.1%
35–44	9.9%
45–54	13.3%
55–64	19.6%
65–74	10.7%
75+	7.6%

Tenure

% of housing units	Value
Owned, with mortgage	54.5%
Owned outright	33.8%
Rented	9.0%
Vacant	2.7%

Type of building

% of housing units	Value
Detached house	90.2%
Townhome	2.7%
2–4 units	5.0%
5–19 units	1.3%
20+ units	0.7%
Mobile / other	0.1%

Businesses in 11731

871 business establishments with 6,541 employees (ZIP Codes Business Patterns 2023).

Construction: 126
Other Services (except Public Administration): 115
Retail Trade: 114
Professional, Scientific, and Technical Services: 109
Health Care and Social Assistance: 77
Accommodation and Food Services: 72
Administrative and Support and Waste Management and Remediation Services: 71
Finance and Insurance: 43

EDDM carrier routes

11731 has 25 USPS carrier routes with 10,284 residential and 573 business mailboxes. Open the EDDM route map.

Carrier routes in 11731

11731 has 25 USPS carrier routes (25 city (C)) with 10,284 residential and 573 business mailboxes. Routes range from 287 homes (C006) to 545 homes (C012); the median route has 408 homes. The Census counted 10,811 households in 11731 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per route	Routes
1–249	0
250–499	24
500–749	1
750–999	0
1,000–1,499	0
1,500+	0

Best routes in 11731 for…

Most businesses

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

Route C006 — USPS business mailboxes 147, 287 homes
Route C010 — USPS business mailboxes 129, 309 homes
Route C027 — USPS business mailboxes 86, 329 homes
Route C001 — USPS business mailboxes 75, 308 homes
Route C004 — USPS business mailboxes 43, 408 homes

Select these 5 routes on the route map

Every carrier route in 11731

Route	Type	Homes	Businesses	Est. median income	Est. owners	Est. families with kids	Est. moved in past year
C001	City	308	75	$134,148	—	—	—
C002	City	388	14	$124,666	—	—	—
C003	City	490	2	$154,061	—	—	—
C004	City	408	43	$124,666	—	—	—
C005	City	499	5	$200,001+	—	—	—
C006	City	287	147	$98,433	—	—	—
C007	City	411	29	$189,309	—	—	—
C009	City	418	6	$159,157	—	—	—
C010	City	309	129	$154,061	—	—	—
C011	City	397	0	$159,157	—	—	—
C012	City	545	1	$191,010	—	—	—
C013	City	472	0	$134,148	—	—	—
C014	City	448	2	$154,061	—	—	—
C016	City	370	2	$98,433	—	—	—
C017	City	434	6	$174,440	—	—	—
C018	City	446	0	$200,001+	—	—	—
C019	City	406	6	$152,108	—	—	—
C020	City	460	1	$155,169	—	—	—
C021	City	464	7	$134,148	—	—	—
C022	City	455	6	$155,169	—	—	—
C024	City	351	0	$131,126	—	—	—
C025	City	401	0	$154,901	—	—	—
C026	City	393	2	$174,440	—	—	—
C027	City	329	86	$155,169	—	—	—
C030	City	395	4	$159,157	—	—	—

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 11731 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

11740 — Greenlawn CDP, NY (2.3 mi)
11725 — Commack CDP, NY (2.4 mi)
11754 — Kings Park CDP, NY (3.8 mi)
11721 — Centerport CDP, NY (4 mi)
11746 — Dix Hills CDP, NY (4.1 mi)
11768 — Fort Salonga CDP, NY (4.4 mi)
11787 — Smithtown CDP, NY (5.6 mi)
11743 — Lloyd Harbor village, NY (5.7 mi)

Areas that include 11731

Commack, NY ZIP codes — 2 ZIP codes
East Northport, NY ZIP codes — 2 ZIP codes
Elwood, NY ZIP codes — 2 ZIP codes
Suffolk County ZIP codes — 108 ZIP codes
New York ZIP code data

Where it ranks

Mail every home in 11731

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) 11731, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 11731 in?: 11731 is a East Northport, NY mailing address. By land area, 47% lies inside East Northport, 25% lies inside Elwood, 23% lies inside Commack and 5% lies inside Dix Hills.
What county is 11731 in?: 11731 is in Suffolk County.
What is the population of 11731?: About 29,999 people (±1,808), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 30,353.
What is the median household income in 11731?: $161,132 (±$8,834), 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 11731?: 25 USPS carrier routes with 10,284 residential and 573 business mailboxes (10,857 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 11731?: The closest, measured center to center: 11740 (2.3 mi, Greenlawn), 11725 (2.4 mi, Commack), 11754 (3.8 mi, Kings Park), 11721 (4 mi, Centerport), 11746 (4.1 mi, Dix Hills) and 11768 (4.4 mi, Fort Salonga).

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