Which ZIP code in Suffolk County has the lowest median age?

11790 (Stony Brook), at 22.3 (±0.6), among 88 ZIP codes with at least 1,000 residents.

Why are some ZIP codes missing?

ZIP codes with fewer than 1,000 residents are left out because their survey estimates swing too much to rank, and so are ZIP codes where the Census Bureau did not publish this figure.

Youngest ZIP codes in Suffolk County, NY

These are the 25 ZIP codes in Suffolk County with the lowest median age, out of 88 with at least 1,000 residents. 11790 (Stony Brook, 22.3), 11950 (Mastic, 31.8) and 11738 (Farmingville, 34.4) lead the list. There is no single "best" ZIP code in Suffolk County; the right one depends on who you want to reach, so the same ZIP codes are ranked several ways below.

Youngest ZIP codes in Suffolk County

Rank	ZIP	Mailing city	Median age	Residents	Households	Residential mailboxes
1	11790	Stony Brook	22.3 ±0.6	21,074	4,455	4,756
2	11950	Mastic	31.8 ±1.5	17,599	4,871	4,766
3	11738	Farmingville	34.4 ±2.1	18,877	5,105	5,388
4	11722	Central Islip	34.9 ±2.2	39,033	9,660	10,045
5	11951	Mastic Beach	35.6 ±3.8	15,938	5,050	4,813
6	11706	Bay Shore	36.6 ±1.2	68,976	19,431	18,506
7	11726	Copiague	36.7 ±3.0	21,455	5,940	5,756
8	11795	West Islip	38.1 ±1.6	25,379	8,011	8,088
9	11934	Center Moriches	38.4 ±5.0	9,418	2,795	3,023
10	11713	Bellport	38.6 ±3.9	9,218	3,169	3,861
11	11763	Medford	38.8 ±2.6	29,973	9,537	9,323
12	11720	Centereach	38.8 ±1.4	29,292	8,860	9,141
13	11729	Deer Park	38.9 ±1.8	27,231	8,697	9,131
14	11980	Yaphank	38.9 ±6.4	5,855	2,574	2,588
15	11784	Selden	39.0 ±1.8	26,244	8,639	7,870
16	11757	Lindenhurst	39.3 ±1.9	44,413	14,246	14,259
17	11742	Holtsville	39.3 ±2.2	13,202	4,651	4,675
18	11779	Ronkonkoma	39.7 ±2.2	38,206	13,215	13,754
19	11704	West Babylon	40.2 ±1.8	40,706	12,754	12,664
20	11755	Lake Grove	40.2 ±3.0	12,144	4,085	4,322
21	11778	Rocky Point	40.4 ±3.7	12,390	4,592	4,668
22	11741	Holbrook	40.5 ±0.6	26,667	9,004	9,583
23	11776	Port Jefferson Station	40.5 ±2.3	22,808	8,037	8,577
24	11941	Eastport	40.8 ±4.1	2,814	1,017	1,045
25	11967	Shirley	40.9 ±1.7	27,975	8,517	8,312

How we ranked them

Ranked by median age of all residents, lowest first (ACS 5-year estimates, 2020–2024). ZIP codes need at least 1,000 residents to be ranked; 88 of 108 qualify.

Which of these to mail, and why

Younger ZIP codes skew toward renters, students and young families: fitness, quick-service food, apartments, entertainment and first-time-buyer offers.

The top five ZIP codes on this list hold 29,141 households, on 58 carrier routes with 29,768 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 11790 on the EDDM route map

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Frequently asked questions

Which ZIP code in Suffolk County has the lowest median age?: 11790 (Stony Brook), at 22.3 (±0.6), among 88 ZIP codes with at least 1,000 residents.
How is this ranking calculated?: Ranked by median age of all residents, lowest first (ACS 5-year estimates, 2020–2024).
Why are some ZIP codes missing?: ZIP codes with fewer than 1,000 residents are left out because their survey estimates swing too much to rank, and so are ZIP codes where the Census Bureau did not publish this figure.

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