Which ZIP code in District of Columbia County has the highest median age?

20015 (Washington), at 45.7 (±3.1), 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.

Oldest ZIP codes in District of Columbia, DC

These are the 25 ZIP codes in District of Columbia with the highest median age, out of 26 with at least 1,000 residents. 20015 (Washington, 45.7), 20016 (Washington, 42.7) and 20004 (Washington, 42.2) lead the list. There is no single "best" ZIP code in District of Columbia 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 District of Columbia County

Rank	ZIP	Mailing city	Median age	Residents	Households	Residential mailboxes
1	20015	Washington	45.7 ±3.1	15,653	6,337	7,289
2	20016	Washington	42.7 ±1.7	32,730	14,294	16,151
3	20004	Washington	42.2 ±2.4	1,831	1,274	1,573
4	20012	Washington	40.2 ±1.2	17,519	7,155	8,723
5	20018	Washington	39.6 ±1.8	19,562	9,021	9,877
6	20008	Washington	39.2 ±1.9	29,434	16,818	18,896
7	20007	Washington	38.3 ±1.8	24,602	12,027	14,169
8	20011	Washington	38.0 ±1.0	67,434	27,774	27,027
9	20017	Washington	36.9 ±0.9	21,208	9,037	9,334
10	20024	Washington	35.5 ±1.2	15,888	10,097	16,160
11	20036	Washington	35.1 ±2.8	4,605	3,885	4,175
12	20005	Washington	34.9 ±1.0	13,131	8,667	9,592
13	20003	Washington	34.7 ±0.5	37,482	19,858	26,471
14	20019	Washington	34.4 ±1.0	63,380	26,254	23,559
15	20009	Washington	34.4 ±0.5	50,150	29,210	33,248
16	20032	Washington	34.3 ±2.2	40,920	17,651	16,516
17	20020	Washington	33.7 ±1.5	53,005	22,943	24,532
18	20002	Washington	33.4 ±0.7	72,397	35,515	46,528
19	20010	Washington	33.2 ±1.2	31,808	14,376	14,755
20	20001	Washington	32.6 ±0.5	44,616	23,868	30,075
21	20037	Washington	30.4 ±2.1	13,156	7,579	8,645
22	20006	Washington	24.5 ±2.8	1,362	729	924
23	20057	Washington	19.7 ±0.3	3,229	0	—
24	20064	Washington	19.7 ±0.4	1,442	0	—
25	20052	Washington	19.6 ±0.3	2,730	82	—

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; 26 of 57 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 38,081 households, on 102 carrier routes with 43,613 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 20015 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 District of Columbia County has the highest median age?: 20015 (Washington), at 45.7 (±3.1), among 26 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.