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

15321 (Cecil), at 33.5%, among 90 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 Allegheny County, PA

These are the 25 ZIP codes in Allegheny County with the fastest population growth, out of 90 with at least 1,000 residents. 15321 (Cecil, 33.5%), 15112 (East Pittsburgh, 27.2%) and 15026 (Clinton, 22.6%) lead the list. There is no single "best" ZIP code in Allegheny 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 Allegheny County

Rank	ZIP	Mailing city	Population change	Residents	Households	Residential mailboxes
1	15321	Cecil	33.5%	2,025	760	748
2	15112	East Pittsburgh	27.2%	3,655	1,527	1,514
3	15026	Clinton	22.6%	4,175	1,622	1,658
4	15142	Presto	19.0%	1,513	722	1,023
5	16046	Mars	18.3%	19,757	7,290	7,478
6	15071	Oakdale	17.3%	12,663	5,064	—
7	15205	Pittsburgh	12.0%	24,060	11,392	12,357
8	15090	Wexford	11.9%	25,763	9,437	9,832
9	15229	Pittsburgh	11.9%	15,188	6,390	6,725
10	15017	Bridgeville	11.6%	17,782	7,987	8,184
11	15236	Pittsburgh	9.6%	31,313	13,405	14,097
12	15213	Pittsburgh	9.3%	30,466	8,915	12,224
13	15024	Cheswick	8.1%	9,325	3,886	3,864
14	15241	Pittsburgh	7.5%	22,294	8,314	8,581
15	15222	Pittsburgh	7.0%	5,725	3,268	5,642
16	15201	Pittsburgh	6.3%	13,333	7,112	7,690
17	15015	Bradfordwoods	5.4%	1,291	511	485
18	15108	Coraopolis	4.5%	42,799	17,079	19,765
19	15131	Mckeesport	4.4%	8,209	4,166	3,968
20	15234	Pittsburgh	4.0%	14,014	6,147	7,134
21	15239	Pittsburgh	3.9%	21,410	8,493	8,918
22	15025	Clairton	3.9%	16,939	6,733	7,286
23	15243	Pittsburgh	3.9%	13,456	5,730	5,936
24	15226	Pittsburgh	3.6%	13,999	6,429	6,647
25	15207	Pittsburgh	3.4%	10,961	4,839	5,001

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; 90 of 112 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 11,921 households, on 22 carrier routes with 12,421 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 15321 on the EDDM route map

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Frequently asked questions

Which ZIP code in Allegheny County has the fastest population growth?: 15321 (Cecil), at 33.5%, among 90 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.