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

18015 (Bethlehem), at 31.2 (±1.9), among 19 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 Northampton County, PA

These are the 19 ZIP codes in Northampton County with the lowest median age, out of 19 with at least 1,000 residents. 18015 (Bethlehem, 31.2), 18042 (Easton, 34.7) and 18085 (Tatamy, 38.9) lead the list. There is no single "best" ZIP code in Northampton 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 Northampton County

Rank	ZIP	Mailing city	Median age	Residents	Households	Residential mailboxes
1	18015	Bethlehem	31.2 ±1.9	34,852	12,150	12,997
2	18042	Easton	34.7 ±1.1	45,532	16,376	17,725
3	18085	Tatamy	38.9 ±3.8	1,175	387	—
4	18018	Bethlehem	39.2 ±1.9	32,965	14,119	15,396
5	18032	Catasauqua	41.0 ±1.9	9,555	4,083	4,152
6	18013	Bangor	41.6 ±2.2	17,597	6,755	7,591
7	18020	Bethlehem	42.8 ±4.6	21,204	7,791	8,347
8	18014	Bath	44.7 ±2.3	12,097	4,617	5,275
9	18017	Bethlehem	45.0 ±1.4	40,640	16,597	16,654
10	18040	Easton	45.2 ±2.7	17,256	6,668	7,229
11	18067	Northampton	45.3 ±2.1	19,590	7,902	8,770
12	18045	Easton	45.4 ±2.0	30,429	12,115	13,139
13	18064	Nazareth	45.5 ±1.5	26,970	10,477	10,536
14	18091	Wind Gap	45.9 ±2.9	6,547	2,673	—
15	18055	Hellertown	46.1 ±2.9	12,117	4,703	5,317
16	18072	Pen Argyl	47.8 ±4.9	6,938	2,729	2,785
17	18038	Danielsville	48.9 ±4.5	3,549	1,395	1,201
18	18088	Walnutport	50.0 ±3.4	8,488	3,296	3,763
19	18343	Mount Bethel	54.2 ±3.1	3,637	1,561	1,708

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; 19 of 24 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 47,115 households. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 18015 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 Northampton County has the lowest median age?: 18015 (Bethlehem), at 31.2 (±1.9), among 19 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.