11951 ZIP Code, Mastic Beach, NY
11951 is a ZIP code in Mastic Beach, New York in Suffolk County. It covers 4.8 square miles of land. The closest ZIP codes are 11950, 11934 and 11967. 15,938 people live here in 5,050 households. At about 3,321 people per square mile it has suburban density, and most homes are owner-occupied (81%). Median household income is $110,862, above the New York median of $85,974; 40% of households have children under 18.
Quick facts
- Mailing city: Mastic Beach, NY
- County: Suffolk County
- Land area: 4.8 sq mi
- Population: 15,938
- Median household income: $110,862
- Carrier routes: 8 (4,813 homes)
Key figures
| Measure | Value |
|---|---|
| Residents | 15,938 |
| Households | 5,050 |
| Median household income | $110,862 |
| Income per person | $36,849 |
| Median age | 35.6 |
| Homeowners | 80.6% |
| Median home value | $355,400 |
| Median rent | $2,422 |
| Bachelor's degree or higher | 24.0% |
| Average commute (minutes) | 37 |
| Households with kids under 18 | 40.0% |
| Moved in the past year | 3.3% |
| Below the poverty line | 21.8% |
| Broadband internet | 96.3% |
| Speak a non-English language at home | 15.6% |
Household income
| % of households | Value |
|---|---|
| <$10K | 10.5% |
| $10–15K | 1.3% |
| $15–25K | 5.7% |
| $25–35K | 5.7% |
| $35–50K | 3.3% |
| $50–75K | 9.0% |
| $75–100K | 10.8% |
| $100–150K | 27.9% |
| $150–200K | 14.5% |
| $200K+ | 11.2% |
Age
| % of all residents | Value |
|---|---|
| <10 | 16.3% |
| 10–19 | 17.6% |
| 20–24 | 4.7% |
| 25–34 | 10.6% |
| 35–44 | 14.8% |
| 45–54 | 11.3% |
| 55–64 | 13.7% |
| 65–74 | 6.3% |
| 75+ | 4.6% |
Tenure
| % of housing units | Value |
|---|---|
| Owned, with mortgage | 54.8% |
| Owned outright | 20.8% |
| Rented | 17.9% |
| Vacant | 6.5% |
Type of building
| % of housing units | Value |
|---|---|
| Detached house | 95.5% |
| Townhome | 1.8% |
| 2–4 units | 1.7% |
| 5–19 units | 0.3% |
| 20+ units | 0.4% |
| Mobile / other | 0.3% |
Businesses in 11951
155 business establishments with 568 employees (ZIP Codes Business Patterns 2023).
- Construction: 58
- Other Services (except Public Administration): 21
- Accommodation and Food Services: 17
- Retail Trade: 16
- Health Care and Social Assistance: 13
- Administrative and Support and Waste Management and Remediation Services: 11
- Professional, Scientific, and Technical Services: 7
- Transportation and Warehousing: 5
EDDM carrier routes
11951 has 8 USPS carrier routes with 4,813 residential and 89 business mailboxes. Open the EDDM route map.
Carrier routes in 11951
11951 has 8 USPS carrier routes (8 city (C)) with 4,813 residential and 89 business mailboxes. Routes range from 265 homes (C008) to 720 homes (C001); the median route has 635 homes. The Census counted 5,050 households in 11951 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.
| Homes per route | Routes |
|---|---|
| 1–249 | 0 |
| 250–499 | 1 |
| 500–749 | 7 |
| 750–999 | 0 |
| 1,000–1,499 | 0 |
| 1,500+ | 0 |
Best routes in 11951 for…
Most businesses
For B2B offers: office supplies, cleaning, IT, catering and commercial services.
- Route C003 — USPS business mailboxes 35, 557 homes
- Route C005 — USPS business mailboxes 25, 691 homes
- Route C006 — USPS business mailboxes 23, 578 homes
- Route C004 — USPS business mailboxes 3, 718 homes
- Route C001 — USPS business mailboxes 1, 720 homes
Select these 5 routes on the route map
Every carrier route in 11951
| Route | Type | Homes | Businesses | Est. median income | Est. owners | Est. families with kids | Est. moved in past year |
|---|---|---|---|---|---|---|---|
| C001 | City | 720 | 1 | $111,951 | — | — | — |
| C002 | City | 707 | 1 | $85,896 | — | — | — |
| C003 | City | 557 | 35 | $102,791 | — | — | — |
| C004 | City | 718 | 3 | $104,722 | — | — | — |
| C005 | City | 691 | 25 | $85,896 | — | — | — |
| C006 | City | 578 | 23 | $81,266 | — | — | — |
| C007 | City | 577 | 1 | $102,791 | — | — | — |
| C008 | City | 265 | 0 | $102,791 | — | — | — |
Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 11951 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
- 11950 — Mastic CDP, NY (2.8 mi)
- 11934 — Center Moriches CDP, NY (3.3 mi)
- 11967 — Shirley CDP, NY (3.3 mi)
- 11955 — Moriches CDP, NY (3.4 mi)
- 11719 — Brookhaven CDP, NY (3.8 mi)
- 11940 — East Moriches CDP, NY (5.1 mi)
- 11713 — North Bellport CDP, NY (5.6 mi)
- 11980 — Yaphank CDP, NY (6.5 mi)
Areas that include 11951
- Mastic Beach, NY ZIP codes — 1 ZIP code
- Suffolk County ZIP codes — 108 ZIP codes
- New York ZIP code data
Where it ranks
- No. 9 of 88: highest share of households with children in Suffolk County
- No. 5 of 88: lowest median age in Suffolk County
- No. 8 of 85: fastest population growth in Suffolk County
Mail every home in 11951
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) 11951, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.
Frequently asked questions
- What city is 11951 in?
- 11951 is a Mastic Beach, NY mailing address. By land area, 100% lies inside Mastic Beach.
- What county is 11951 in?
- 11951 is in Suffolk County.
- What is the population of 11951?
- About 15,938 people (±1,963), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 13,827.
- What is the median household income in 11951?
- $110,862 (±$14,980), 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 11951?
- 8 USPS carrier routes with 4,813 residential and 89 business mailboxes (4,901 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
- What ZIP codes are near 11951?
- The closest, measured center to center: 11950 (2.8 mi, Mastic), 11934 (3.3 mi, Center Moriches), 11967 (3.3 mi, Shirley), 11955 (3.4 mi, Moriches), 11719 (3.8 mi, Brookhaven) and 11940 (5.1 mi, East Moriches).
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.