11721 ZIP Code, Centerport, NY
11721 is a ZIP code in Centerport, New York in Suffolk County. It covers 2.5 square miles of land. The closest ZIP codes are 11768, 11740 and 11743. 6,426 people live here in 2,417 households. At about 2,561 people per square mile it has suburban density, and most homes are owner-occupied (97%). Median household income is $197,179, well above the New York median of $85,974; the median age is 50.2, older than most ZIP codes.
Quick facts
- Mailing city: Centerport, NY
- County: Suffolk County
- Land area: 2.5 sq mi
- Population: 6,426
- Median household income: $197,179
- Carrier routes: 5 (2,351 homes)
Key figures
| Measure | Value |
|---|---|
| Residents | 6,426 |
| Households | 2,417 |
| Median household income | $197,179 |
| Income per person | $109,501 |
| Median age | 50.2 |
| Homeowners | 96.6% |
| Median home value | $740,300 |
| Median rent | $3,501 |
| Bachelor's degree or higher | 71.4% |
| Average commute (minutes) | 35.3 |
| Households with kids under 18 | 24.6% |
| Moved in the past year | 8.3% |
| Below the poverty line | 4.1% |
| Broadband internet | 98.5% |
| Speak a non-English language at home | 8.5% |
Household income
| % of households | Value |
|---|---|
| <$10K | 1.6% |
| $10–15K | 0.0% |
| $15–25K | 1.4% |
| $25–35K | 1.7% |
| $35–50K | 4.3% |
| $50–75K | 4.8% |
| $75–100K | 8.6% |
| $100–150K | 12.9% |
| $150–200K | 16.6% |
| $200K+ | 48.2% |
Age
| % of all residents | Value |
|---|---|
| <10 | 8.0% |
| 10–19 | 13.2% |
| 20–24 | 3.4% |
| 25–34 | 12.0% |
| 35–44 | 6.2% |
| 45–54 | 17.3% |
| 55–64 | 19.1% |
| 65–74 | 13.4% |
| 75+ | 7.5% |
Tenure
| % of housing units | Value |
|---|---|
| Owned, with mortgage | 55.4% |
| Owned outright | 38.7% |
| Rented | 3.3% |
| Vacant | 2.7% |
Type of building
| % of housing units | Value |
|---|---|
| Detached house | 95.0% |
| Townhome | 3.3% |
| 2–4 units | 0.9% |
| 5–19 units | 0.0% |
| 20+ units | 0.8% |
| Mobile / other | 0.0% |
Businesses in 11721
175 business establishments with 735 employees (ZIP Codes Business Patterns 2023).
- Professional, Scientific, and Technical Services: 46
- Construction: 27
- Other Services (except Public Administration): 16
- Health Care and Social Assistance: 14
- Accommodation and Food Services: 12
- Finance and Insurance: 10
- Real Estate and Rental and Leasing: 10
- Arts, Entertainment, and Recreation: 10
EDDM carrier routes
11721 has 5 USPS carrier routes with 2,351 residential and 50 business mailboxes. Open the EDDM route map.
Carrier routes in 11721
11721 has 5 USPS carrier routes (5 city (C)) with 2,351 residential and 50 business mailboxes. Routes range from 423 homes (C006) to 551 homes (C001); the median route has 438 homes. The Census counted 2,417 households in 11721 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.
| Homes per route | Routes |
|---|---|
| 1–249 | 0 |
| 250–499 | 3 |
| 500–749 | 2 |
| 750–999 | 0 |
| 1,000–1,499 | 0 |
| 1,500+ | 0 |
Best routes in 11721 for…
Most businesses
For B2B offers: office supplies, cleaning, IT, catering and commercial services.
- Route C006 — USPS business mailboxes 29, 423 homes
- Route C003 — USPS business mailboxes 11, 438 homes
- Route C005 — USPS business mailboxes 7, 512 homes
- Route C004 — USPS business mailboxes 3, 427 homes
Select these 4 routes on the route map
Every carrier route in 11721
| Route | Type | Homes | Businesses | Est. median income | Est. owners | Est. families with kids | Est. moved in past year |
|---|---|---|---|---|---|---|---|
| C001 | City | 551 | 0 | $169,059 | — | — | — |
| C003 | City | 438 | 11 | $200,001+ | — | — | — |
| C004 | City | 427 | 3 | $200,001+ | — | — | — |
| C005 | City | 512 | 7 | $158,892 | — | — | — |
| C006 | City | 423 | 29 | $158,892 | — | — | — |
Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 11721 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
- 11768 — Fort Salonga CDP, NY (2.2 mi)
- 11740 — Greenlawn CDP, NY (2.6 mi)
- 11743 — Lloyd Harbor village, NY (3 mi)
- 11731 — East Northport CDP, NY (4 mi)
- 11724 — Cold Spring Harbor CDP, NY (5.2 mi)
- 11746 — Dix Hills CDP, NY (6.1 mi)
- 11725 — Commack CDP, NY (6.4 mi)
- 11754 — Kings Park CDP, NY (6.5 mi)
Areas that include 11721
- Centerport, NY ZIP codes — 1 ZIP code
- Suffolk County ZIP codes — 108 ZIP codes
- New York ZIP code data
Where it ranks
- No. 3 of 88: highest median household income in Suffolk County
- No. 22 of 88: highest median home value in Suffolk County
- No. 2 of 88: highest share of owner-occupied homes in Suffolk County
- No. 24 of 88: highest share of residents who moved in during the past year in Suffolk County
- No. 15 of 88: highest median age in Suffolk County
Mail every home in 11721
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) 11721, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.
Frequently asked questions
- What city is 11721 in?
- 11721 is a Centerport, NY mailing address. By land area, 84% lies inside Centerport, 9% lies inside Greenlawn and 7% lies inside Huntington.
- What county is 11721 in?
- 11721 is in Suffolk County.
- What is the population of 11721?
- About 6,426 people (±705), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 6,318.
- What is the median household income in 11721?
- $197,179 (±$16,000), 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 11721?
- 5 USPS carrier routes with 2,351 residential and 50 business mailboxes (2,401 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
- What ZIP codes are near 11721?
- The closest, measured center to center: 11768 (2.2 mi, Fort Salonga), 11740 (2.6 mi, Greenlawn), 11743 (3 mi, Lloyd Harbor), 11731 (4 mi, East Northport), 11724 (5.2 mi, Cold Spring Harbor) and 11746 (6.1 mi, Dix Hills).
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.