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

08530 (Lambertville), at 53.3 (±2.2), 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.

Oldest ZIP codes in Mercer County, NJ

These are the 22 ZIP codes in Mercer County with the highest median age, out of 22 with at least 1,000 residents. 08530 (Lambertville, 53.3), 08560 (Titusville, 52.4) and 08690 (Trenton, 47.0) 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.

Oldest ZIP codes in Mercer County

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

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; 22 of 23 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 22,380 households, on 46 carrier routes with 22,942 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 08530 on the EDDM route map

More rankings

Businesses that mail these ZIP codes

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Frequently asked questions

Which ZIP code in Mercer County has the highest median age?: 08530 (Lambertville), at 53.3 (±2.2), among 22 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.