What city is 11783 in?

11783 is a Seaford, NY mailing address. By land area, 72% lies inside Seaford, 11% lies inside North Wantagh, 10% lies inside Levittown and 5% lies inside North Massapequa.

What is the population of 11783?

About 21,127 people (±1,436), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 21,299.

What is the median household income in 11783?

$176,993 (±$15,944), 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 11783?

18 USPS carrier routes with 7,240 residential and 325 business mailboxes (7,565 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.

What ZIP codes are near 11783?

The closest, measured center to center: 11762 (2.3 mi, Massapequa Park), 11710 (2.4 mi, North Bellmore), 11758 (2.4 mi, Massapequa), 11793 (2.4 mi, Wantagh), 11756 (3.5 mi, Levittown) and 11566 (3.6 mi, Merrick).

11783 ZIP Code, Seaford, NY

11783 is a ZIP code in Seaford, New York in Nassau County. It covers 3.5 square miles of land. The closest ZIP codes are 11762, 11710 and 11758. 21,127 people live here in 7,084 households. At about 5,965 people per square mile it is built up to city-neighborhood density, and most homes are owner-occupied (94%). Median household income is $176,993, well above the New York median of $85,974.

Quick facts

Mailing city: Seaford, NY
County: Nassau County
Land area: 3.5 sq mi
Population: 21,127
Median household income: $176,993
Carrier routes: 18 (7,240 homes)

Key figures

Measure	Value
Residents	21,127
Households	7,084
Median household income	$176,993
Income per person	$66,820
Median age	41.3
Homeowners	93.6%
Median home value	$654,300
Median rent	$2,612
Bachelor's degree or higher	47.6%
Average commute (minutes)	38
Households with kids under 18	36.2%
Moved in the past year	3.5%
Below the poverty line	2.8%
Broadband internet	94.0%
Speak a non-English language at home	11.4%

Household income

% of households	Value
<$10K	1.6%
$10–15K	0.5%
$15–25K	3.0%
$25–35K	2.5%
$35–50K	3.0%
$50–75K	5.4%
$75–100K	6.6%
$100–150K	19.6%
$150–200K	17.4%
$200K+	40.6%

Age

% of all residents	Value
<10	9.8%
10–19	11.9%
20–24	6.2%
25–34	14.4%
35–44	11.1%
45–54	11.2%
55–64	17.0%
65–74	10.8%
75+	7.7%

Tenure

% of housing units	Value
Owned, with mortgage	57.4%
Owned outright	33.8%
Rented	6.0%
Vacant	2.8%

Type of building

% of housing units	Value
Detached house	95.0%
Townhome	0.9%
2–4 units	2.0%
5–19 units	0.8%
20+ units	0.8%
Mobile / other	0.5%

Businesses in 11783

494 business establishments with 4,340 employees (ZIP Codes Business Patterns 2023).

Construction: 89
Retail Trade: 70
Professional, Scientific, and Technical Services: 63
Other Services (except Public Administration): 56
Accommodation and Food Services: 47
Health Care and Social Assistance: 41
Administrative and Support and Waste Management and Remediation Services: 29
Wholesale Trade: 19

EDDM carrier routes

11783 has 18 USPS carrier routes with 7,240 residential and 325 business mailboxes. Open the EDDM route map.

Carrier routes in 11783

11783 has 18 USPS carrier routes (18 city (C)) with 7,240 residential and 325 business mailboxes. Routes range from 319 homes (C014) to 580 homes (C012); the median route has 390 homes. The Census counted 7,084 households in 11783 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per route	Routes
1–249	0
250–499	16
500–749	2
750–999	0
1,000–1,499	0
1,500+	0

Best routes in 11783 for…

Most businesses

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

Route C001 — USPS business mailboxes 77, 394 homes
Route C007 — USPS business mailboxes 77, 320 homes
Route C014 — USPS business mailboxes 41, 319 homes
Route C013 — USPS business mailboxes 33, 349 homes
Route C012 — USPS business mailboxes 26, 580 homes

Select these 5 routes on the route map

Every carrier route in 11783

Route	Type	Homes	Businesses	Est. median income	Est. owners	Est. families with kids	Est. moved in past year
C001	City	394	77	$168,776	—	—	—
C002	City	414	1	$167,133	—	—	—
C003	City	457	4	$156,410	—	—	—
C004	City	385	1	$168,776	—	—	—
C006	City	413	12	$165,615	—	—	—
C007	City	320	77	$118,542	—	—	—
C008	City	396	1	$165,615	—	—	—
C009	City	338	2	$160,735	—	—	—
C010	City	416	4	$200,001+	—	—	—
C011	City	493	2	$200,001+	—	—	—
C012	City	580	26	$119,797	—	—	—
C013	City	349	33	$167,133	—	—	—
C014	City	319	41	$154,613	—	—	—
C015	City	375	1	$161,699	—	—	—
C016	City	526	1	$118,542	—	—	—
C017	City	335	24	$167,133	—	—	—
C019	City	374	16	$165,615	—	—	—
C020	City	356	2	$166,334	—	—	—

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 11783 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

11762 — Massapequa Park village, NY (2.3 mi)
11710 — North Bellmore CDP, NY (2.4 mi)
11758 — Massapequa CDP, NY (2.4 mi)
11793 — Wantagh CDP, NY (2.4 mi)
11756 — Levittown CDP, NY (3.5 mi)
11566 — Merrick CDP, NY (3.6 mi)
11701 — Amityville village, NY (4 mi)
11714 — Bethpage CDP, NY (4.5 mi)

Areas that include 11783

Levittown, NY ZIP codes — 3 ZIP codes
Seaford, NY ZIP codes — 1 ZIP code
North Wantagh, NY ZIP codes — 2 ZIP codes
Nassau County ZIP codes — 70 ZIP codes
New York ZIP code data

Where it ranks

Mail every home in 11783

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) 11783, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 11783 in?: 11783 is a Seaford, NY mailing address. By land area, 72% lies inside Seaford, 11% lies inside North Wantagh, 10% lies inside Levittown and 5% lies inside North Massapequa.
What county is 11783 in?: 11783 is in Nassau County.
What is the population of 11783?: About 21,127 people (±1,436), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 21,299.
What is the median household income in 11783?: $176,993 (±$15,944), 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 11783?: 18 USPS carrier routes with 7,240 residential and 325 business mailboxes (7,565 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 11783?: The closest, measured center to center: 11762 (2.3 mi, Massapequa Park), 11710 (2.4 mi, North Bellmore), 11758 (2.4 mi, Massapequa), 11793 (2.4 mi, Wantagh), 11756 (3.5 mi, Levittown) and 11566 (3.6 mi, Merrick).

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