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

21155 (Upperco), at 33.7 (±7.6), among 14 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 Carroll County, MD

These are the 14 ZIP codes in Carroll County with the lowest median age, out of 14 with at least 1,000 residents. 21155 (Upperco, 33.7), 21791 (Union Bridge, 37.7) and 21757 (Keymar, 37.8) lead the list. There is no single "best" ZIP code in Carroll 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 Carroll County

Rank	ZIP	Mailing city	Median age	Residents	Households	Residential mailboxes
1	21155	Upperco	33.7 ±7.6	3,313	1,032	1,008
2	21791	Union Bridge	37.7 ±4.9	5,340	1,968	1,829
3	21757	Keymar	37.8 ±5.3	2,671	1,018	1,097
4	21784	Sykesville	38.9 ±1.0	39,258	13,416	14,941
5	21787	Taneytown	40.1 ±3.3	11,645	4,431	4,630
6	21771	Mount Airy	40.9 ±1.7	33,031	11,226	11,089
7	21158	Westminster	41.6 ±2.4	22,083	8,451	8,114
8	21048	Finksburg	41.7 ±2.3	10,481	3,723	4,112
9	21074	Hampstead	42.9 ±3.3	14,777	5,889	6,081
10	21104	Marriottsville	43.1 ±4.2	6,052	2,097	2,277
11	21157	Westminster	43.2 ±1.4	38,984	14,785	15,042
12	21776	New Windsor	44.1 ±6.5	6,261	2,346	2,091
13	21102	Manchester	44.5 ±2.9	12,162	4,413	4,295
14	21797	Woodbine	45.3 ±3.6	8,643	2,849	3,313

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; 14 of 14 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 21,865 households, on 44 carrier routes with 23,505 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 21155 on the EDDM route map

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Businesses that mail these ZIP codes

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Frequently asked questions

Which ZIP code in Carroll County has the lowest median age?: 21155 (Upperco), at 33.7 (±7.6), among 14 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.