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

21727 (Emmitsburg), at 29.5 (±5.2), 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.

Youngest ZIP codes in Frederick County, MD

These are the 25 ZIP codes in Frederick County with the lowest median age, out of 26 with at least 1,000 residents. 21727 (Emmitsburg, 29.5), 21703 (Frederick, 34.6) and 21774 (New Market, 36.1) lead the list. There is no single "best" ZIP code in Frederick 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 Frederick County

Rank	ZIP	Mailing city	Median age	Residents	Households	Residential mailboxes
1	21727	Emmitsburg	29.5 ±5.2	6,052	1,673	1,454
2	21703	Frederick	34.6 ±1.1	41,960	15,517	—
3	21774	New Market	36.1 ±2.0	17,134	5,647	6,693
4	21791	Union Bridge	37.7 ±4.9	5,340	1,968	1,829
5	21757	Keymar	37.8 ±5.3	2,671	1,018	1,097
6	21702	Frederick	38.1 ±1.0	49,605	18,525	19,996
7	21716	Brunswick	38.5 ±2.4	7,200	2,924	3,371
8	21704	Frederick	38.6 ±1.4	20,006	6,136	7,734
9	21758	Knoxville	39.0 ±8.9	4,409	1,588	1,841
10	21701	Frederick	39.6 ±1.1	43,048	18,651	20,269
11	21770	Monrovia	39.8 ±2.4	8,751	2,622	2,971
12	21787	Taneytown	40.1 ±3.3	11,645	4,431	4,630
13	21771	Mount Airy	40.9 ±1.7	33,031	11,226	11,089
14	21754	Ijamsville	41.2 ±2.7	8,156	2,660	2,604
15	21798	Woodsboro	41.3 ±4.4	2,928	929	914
16	21780	Sabillasville	41.5 ±6.6	2,159	781	670
17	21793	Walkersville	42.8 ±0.9	10,719	3,890	3,825
18	21783	Smithsburg	42.8 ±3.8	9,910	3,632	3,304
19	21755	Jefferson	43.2 ±4.3	5,909	2,136	2,284
20	21769	Middletown	43.3 ±2.6	11,965	4,146	4,409
21	21773	Myersville	43.8 ±3.0	5,826	1,997	1,935
22	21777	Point Of Rocks	43.8 ±7.7	2,462	817	624
23	21776	New Windsor	44.1 ±6.5	6,261	2,346	2,091
24	21788	Thurmont	44.6 ±3.3	11,654	4,649	4,704
25	20842	Dickerson	48.5 ±5.4	2,369	802	753

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; 26 of 33 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 25,823 households. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 21727 on the EDDM route map

More rankings

Businesses that mail these ZIP codes

Map it and price it

EDDM guides

Frequently asked questions

Which ZIP code in Frederick County has the lowest median age?: 21727 (Emmitsburg), at 29.5 (±5.2), among 26 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.