Which ZIP code in Howard County has the highest median age?

21036 (Dayton), at 48.8 (±7.3), among 22 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.

Oldest ZIP codes in Howard County, MD

These are the 22 ZIP codes in Howard County with the highest median age, out of 22 with at least 1,000 residents. 21036 (Dayton, 48.8), 20777 (Highland, 45.5) and 21163 (Woodstock, 45.4) lead the list. There is no single "best" ZIP code in Howard County; the right one depends on who you want to reach, so the same ZIP codes are ranked several ways below.

Oldest ZIP codes in Howard County

Rank	ZIP	Mailing city	Median age	Residents	Households	Residential mailboxes
1	21036	Dayton	48.8 ±7.3	2,569	882	790
2	20777	Highland	45.5 ±2.2	3,221	1,097	1,193
3	21163	Woodstock	45.4 ±2.8	7,539	2,680	2,794
4	21797	Woodbine	45.3 ±3.6	8,643	2,849	3,313
5	21042	Ellicott City	45.1 ±1.0	43,327	15,099	16,083
6	21794	West Friendship	43.4 ±5.9	2,192	660	829
7	21029	Clarksville	43.1 ±2.1	13,607	4,056	4,113
8	21104	Marriottsville	43.1 ±4.2	6,052	2,097	2,277
9	21738	Glenwood	41.2 ±5.8	3,696	1,121	1,092
10	21771	Mount Airy	40.9 ±1.7	33,031	11,226	11,089
11	20759	Fulton	40.6 ±3.6	6,624	1,993	2,393
12	21043	Ellicott City	40.3 ±1.1	48,525	17,568	18,948
13	21044	Columbia	40.0 ±1.5	44,114	18,293	20,280
14	21045	Columbia	39.6 ±1.1	40,034	15,414	15,244
15	21784	Sykesville	38.9 ±1.0	39,258	13,416	14,941
16	21737	Glenelg	38.8 ±9.4	2,474	739	634
17	21076	Hanover	38.1 ±2.6	24,268	9,785	11,395
18	21046	Columbia	37.3 ±2.1	15,608	6,165	6,431
19	20723	Laurel	37.2 ±1.2	36,866	12,497	13,160
20	20794	Jessup	36.8 ±1.9	16,814	3,928	4,565
21	20763	Savage	35.9 ±5.1	2,601	1,142	1,049
22	21075	Elkridge	34.1 ±1.0	37,363	13,038	13,707

How we ranked them

Ranked by median age of all residents, highest first (ACS 5-year estimates, 2020–2024). ZIP codes need at least 1,000 residents to be ranked; 22 of 24 qualify.

Which of these to mail, and why

Older ZIP codes respond to health care, hearing and vision, Medicare plans, home safety, estate planning and services that come to the door.

The top five ZIP codes on this list hold 22,607 households, on 46 carrier routes with 24,173 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 21036 on the EDDM route map

More rankings

Businesses that mail these ZIP codes

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Frequently asked questions

Which ZIP code in Howard County has the highest median age?: 21036 (Dayton), at 48.8 (±7.3), among 22 ZIP codes with at least 1,000 residents.
How is this ranking calculated?: Ranked by median age of all residents, highest 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.