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

08544 (Princeton), at 20.4 (±0.2), among 22 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 Mercer County, NJ

These are the 22 ZIP codes in Mercer County with the lowest median age, out of 22 with at least 1,000 residents. 08544 (Princeton, 20.4), 08608 (Trenton, 31.4) and 08629 (Trenton, 33.3) lead the list. There is no single "best" ZIP code in Mercer 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 Mercer County

Rank	ZIP	Mailing city	Median age	Residents	Households	Residential mailboxes
1	08544	Princeton	20.4 ±0.2	4,392	12	—
2	08608	Trenton	31.4 ±7.3	1,250	653	780
3	08629	Trenton	33.3 ±3.4	13,013	4,296	4,109
4	08609	Trenton	33.4 ±2.1	15,938	4,880	5,122
5	08611	Trenton	34.6 ±2.6	31,995	10,716	9,099
6	08618	Trenton	35.0 ±3.2	35,634	13,477	14,571
7	08638	Trenton	35.9 ±2.8	22,816	9,045	9,709
8	08542	Princeton	37.2 ±6.6	2,533	1,264	1,631
9	08610	Trenton	38.9 ±1.8	33,465	12,315	12,123
10	08648	Lawrence Township	39.5 ±1.9	31,323	12,030	12,715
11	08540	Princeton	40.6 ±1.0	50,388	18,609	20,795
12	08520	Hightstown	40.9 ±1.5	29,504	10,974	10,981
13	08534	Pennington	41.6 ±3.2	13,272	4,995	5,442
14	08619	Trenton	42.4 ±3.4	24,089	9,924	10,011
15	08620	Trenton	42.7 ±6.1	11,621	4,187	4,647
16	08691	Robbinsville	44.6 ±1.1	16,607	6,859	6,843
17	08628	Trenton	45.0 ±2.9	9,831	4,468	5,271
18	08525	Hopewell	45.3 ±2.2	4,522	1,903	1,946
19	08550	Princeton Junction	45.4 ±0.8	21,067	7,817	7,609
20	08690	Trenton	47.0 ±3.8	18,841	7,731	8,114
21	08560	Titusville	52.4 ±7.3	3,245	1,333	1,786
22	08530	Lambertville	53.3 ±2.2	8,119	3,596	3,487

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; 22 of 23 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 20,557 households. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 08544 on the EDDM route map

More rankings

Businesses that mail these ZIP codes

Map it and price it

EDDM guides

Frequently asked questions

Which ZIP code in Mercer County has the lowest median age?: 08544 (Princeton), at 20.4 (±0.2), among 22 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.