Which ZIP code in Middlesex County has the highest median age?

08831 (Monroe Township), at 54.8 (±1.4), among 40 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.

Oldest ZIP codes in Middlesex County, NJ

These are the 25 ZIP codes in Middlesex County with the highest median age, out of 40 with at least 1,000 residents. 08831 (Monroe Township, 54.8), 08512 (Cranbury, 48.9) and 08884 (Spotswood, 46.0) lead the list. There is no single "best" ZIP code in Middlesex County; the right one depends on who you want to reach, so the same ZIP codes are ranked several ways below.

Oldest ZIP codes in Middlesex County

Rank	ZIP	Mailing city	Median age	Residents	Households	Residential mailboxes
1	08831	Monroe Township	54.8 ±1.4	55,658	24,083	26,224
2	08512	Cranbury	48.9 ±3.6	12,928	5,102	5,035
3	08884	Spotswood	46.0 ±5.4	8,187	3,323	2,723
4	08824	Kendall Park	45.5 ±2.3	13,366	4,489	4,416
5	08846	Middlesex	44.3 ±3.7	14,645	5,718	5,461
6	07077	Sewaren	44.2 ±5.1	3,248	1,291	970
7	07067	Colonia	43.6 ±1.7	18,587	6,262	6,606
8	07735	Keyport	43.1 ±3.1	19,159	8,191	7,863
9	08820	Edison	42.9 ±1.2	39,978	13,181	13,536
10	08812	Dunellen	42.9 ±2.0	14,224	4,730	5,368
11	08857	Old Bridge	42.3 ±1.7	40,891	15,740	12,965
12	08850	Milltown	42.1 ±3.6	8,538	3,149	3,154
13	08832	Keasbey	42.0 ±12.5	2,252	850	1,063
14	08810	Dayton	41.8 ±3.5	7,952	2,641	2,746
15	07080	South Plainfield	41.7 ±1.3	24,411	8,324	8,433
16	08816	East Brunswick	41.3 ±1.1	49,360	16,715	17,984
17	07747	Matawan	41.3 ±2.0	32,330	13,097	13,070
18	07064	Port Reading	41.2 ±5.1	3,481	1,101	1,449
19	08879	South Amboy	41.0 ±2.4	23,556	9,344	9,645
20	08540	Princeton	40.6 ±1.0	50,388	18,609	20,795
21	08863	Fords	39.9 ±3.5	12,771	4,744	4,736
22	07001	Avenel	39.6 ±1.8	17,121	5,615	5,760
23	08872	Sayreville	39.3 ±2.3	20,204	7,449	7,999
24	08840	Metuchen	39.2 ±1.2	18,206	6,378	6,986
25	08828	Helmetta	39.2 ±3.9	2,459	1,074	1,082

How we ranked them

Ranked by median age of all residents, highest first (ACS 5-year estimates, 2020–2024). ZIP codes need at least 1,000 residents to be ranked; 40 of 40 qualify.

Which of these to mail, and why

Older ZIP codes respond to health care, hearing and vision, Medicare plans, home safety, estate planning and services that come to the door.

The top five ZIP codes on this list hold 42,715 households, on 85 carrier routes with 43,859 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 08831 on the EDDM route map

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Businesses that mail these ZIP codes

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Frequently asked questions

Which ZIP code in Middlesex County has the highest median age?: 08831 (Monroe Township), at 54.8 (±1.4), among 40 ZIP codes with at least 1,000 residents.
How is this ranking calculated?: Ranked by median age of all residents, highest 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.