Which ZIP code in Lehigh County has the fastest population growth?

18101 (Allentown), at 29.7%, among 26 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.

Fastest-growing ZIP codes in Lehigh County, PA

These are the 25 ZIP codes in Lehigh County with the fastest population growth, out of 26 with at least 1,000 residents. 18101 (Allentown, 29.7%), 18036 (Coopersburg, 11.8%) and 18041 (East Greenville, 9.8%) lead the list. There is no single "best" ZIP code in Lehigh County; the right one depends on who you want to reach, so the same ZIP codes are ranked several ways below.

Fastest-growing ZIP codes in Lehigh County

Rank	ZIP	Mailing city	Population change	Residents	Households	Residential mailboxes
1	18101	Allentown	29.7%	6,120	2,576	—
2	18036	Coopersburg	11.8%	15,581	6,009	5,856
3	18041	East Greenville	9.8%	5,768	2,373	2,219
4	18031	Breinigsville	8.9%	11,570	4,098	4,829
5	18104	Allentown	8.4%	48,683	18,532	19,434
6	18049	Emmaus	7.8%	18,941	7,702	8,401
7	18053	Germansville	7.4%	2,344	918	913
8	18069	Orefield	6.8%	8,515	3,146	2,990
9	18052	Whitehall	6.4%	29,451	11,713	11,982
10	18051	Fogelsville	5.7%	3,624	1,491	1,875
11	18018	Bethlehem	5.3%	32,965	14,119	15,396
12	18062	Macungie	5.2%	27,110	10,037	10,474
13	18103	Allentown	5.1%	48,746	18,880	19,345
14	18015	Bethlehem	4.2%	34,852	12,150	12,997
15	18109	Allentown	3.7%	18,446	7,030	7,391
16	18078	Schnecksville	3.1%	7,857	2,794	2,814
17	18102	Allentown	3.0%	51,001	17,289	17,779
18	18032	Catasauqua	1.7%	9,555	4,083	4,152
19	18092	Zionsville	1.2%	3,230	1,229	1,241
20	18034	Center Valley	0.3%	9,209	2,922	3,296
21	18080	Slatington	0.1%	11,226	4,553	4,950
22	18037	Coplay	-4.3%	7,472	3,035	3,156
23	18011	Alburtis	-4.3%	5,338	1,958	2,138
24	18066	New Tripoli	-4.7%	6,102	2,331	2,348
25	19529	Kempton	-6.4%	3,109	1,132	1,168

How we ranked them

Ranked by the change in ACS population estimates between the 2015–2019 and 2020–2024 releases. Both are 5-year averages, and ZIP code areas were redrawn for 2020, so a large change can partly reflect a boundary change. Both periods must have at least 1,000 residents. ZIP codes need at least 1,000 residents to be ranked; 26 of 32 qualify.

Which of these to mail, and why

Growing ZIP codes add households every year, which means new homes, new routes and customers without a go-to provider yet. Check the route map: new subdivisions can appear as new carrier routes.

The top five ZIP codes on this list hold 33,588 households. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 18101 on the EDDM route map

More rankings

Businesses that mail these ZIP codes

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Frequently asked questions

Which ZIP code in Lehigh County has the fastest population growth?: 18101 (Allentown), at 29.7%, among 26 ZIP codes with at least 1,000 residents.
How is this ranking calculated?: Ranked by the change in ACS population estimates between the 2015–2019 and 2020–2024 releases. Both are 5-year averages, and ZIP code areas were redrawn for 2020, so a large change can partly reflect a boundary change. Both periods must have 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.

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