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

21740 (Hagerstown), at 37.9 (±0.9), among 16 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 Washington County, MD

These are the 16 ZIP codes in Washington County with the lowest median age, out of 16 with at least 1,000 residents. 21740 (Hagerstown, 37.9), 21746 (Hagerstown, 38.0) and 21758 (Knoxville, 39.0) lead the list. There is no single "best" ZIP code in Washington 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 Washington County

Rank	ZIP	Mailing city	Median age	Residents	Households	Residential mailboxes
1	21740	Hagerstown	37.9 ±0.9	64,792	25,276	26,763
2	21746	Hagerstown	38.0 ±2.0	2,361	0	—
3	21758	Knoxville	39.0 ±8.9	4,409	1,588	1,841
4	21719	Cascade	39.3 ±12.5	1,178	494	551
5	21722	Clear Spring	40.7 ±4.4	6,721	2,222	1,989
6	21795	Williamsport	41.0 ±2.5	10,144	3,935	4,115
7	21733	Fairplay	41.2 ±11.7	1,275	471	451
8	21742	Hagerstown	41.7 ±2.1	34,069	13,231	14,437
9	21756	Keedysville	41.8 ±5.8	3,640	1,394	1,319
10	21779	Rohrersville	41.8 ±8.1	1,311	462	420
11	21783	Smithsburg	42.8 ±3.8	9,910	3,632	3,304
12	21713	Boonsboro	45.5 ±3.2	9,846	3,899	3,877
13	21782	Sharpsburg	48.7 ±3.8	3,704	1,522	1,426
14	21750	Hancock	50.1 ±2.7	3,417	1,628	1,686
15	21767	Maugansville	51.4 ±22.3	1,031	541	338
16	21734	Funkstown	52.4 ±6.8	1,076	493	—

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; 16 of 19 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 29,580 households. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 21740 on the EDDM route map

More rankings

Businesses that mail these ZIP codes

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EDDM guides

Frequently asked questions

Which ZIP code in Washington County has the lowest median age?: 21740 (Hagerstown), at 37.9 (±0.9), among 16 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.