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

21013 (Baldwin), at 17.7%, among 20 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 Harford County, MD

These are the 20 ZIP codes in Harford County with the fastest population growth, out of 20 with at least 1,000 residents. 21013 (Baldwin, 17.7%), 21047 (Fallston, 12.9%) and 21154 (Street, 12.7%) lead the list. There is no single "best" ZIP code in Harford 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 Harford County

Rank	ZIP	Mailing city	Population change	Residents	Households	Residential mailboxes
1	21013	Baldwin	17.7%	5,610	1,843	1,714
2	21047	Fallston	12.9%	13,852	4,810	4,844
3	21154	Street	12.7%	6,544	2,403	2,336
4	21009	Abingdon	12.6%	33,679	12,940	12,564
5	21028	Churchville	11.5%	3,103	1,066	1,200
6	21001	Aberdeen	9.8%	27,168	11,204	12,341
7	21078	Havre De Grace	9.1%	20,030	8,476	9,237
8	21085	Joppa	7.8%	17,307	6,801	7,391
9	21014	Bel Air	5.9%	38,707	15,143	15,327
10	21040	Edgewood	3.3%	24,960	9,795	9,430
11	21015	Bel Air	2.8%	30,013	11,012	12,380
12	21132	Pylesville	-2.2%	3,160	1,072	1,025
13	21050	Forest Hill	-3.6%	17,466	6,422	7,054
14	21017	Belcamp	-4.8%	6,648	2,669	2,777
15	21161	White Hall	-6.8%	5,221	1,887	2,087
16	21084	Jarrettsville	-7.0%	7,070	2,724	2,745
17	21111	Monkton	-12.5%	4,714	1,908	1,915
18	21160	Whiteford	-16.8%	2,441	968	960
19	21034	Darlington	-18.3%	2,846	1,132	1,404
20	21005	Aberdeen Proving Ground	-23.3%	2,202	835	1,010

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; 20 of 22 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 23,062 households, on 37 carrier routes with 22,658 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 21013 on the EDDM route map

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Frequently asked questions

Which ZIP code in Harford County has the fastest population growth?: 21013 (Baldwin), at 17.7%, among 20 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.