Which ZIP code in St. Louis County has the highest median age?

63127 (Saint Louis), at 54.5 (±2.9), among 44 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 St. Louis County, MO

These are the 25 ZIP codes in St. Louis County with the highest median age, out of 44 with at least 1,000 residents. 63127 (Saint Louis, 54.5), 63124 (Saint Louis, 49.2) and 63017 (Chesterfield, 47.9) lead the list. There is no single "best" ZIP code in St. Louis 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 St. Louis County

Rank	ZIP	Mailing city	Median age	Residents	Households	Residential mailboxes
1	63127	Saint Louis	54.5 ±2.9	5,268	2,149	2,378
2	63124	Saint Louis	49.2 ±4.6	10,839	4,832	5,165
3	63017	Chesterfield	47.9 ±2.3	43,243	17,957	18,881
4	63128	Saint Louis	47.9 ±2.4	30,540	13,032	13,196
5	63131	Saint Louis	46.3 ±2.6	17,935	6,511	6,482
6	63038	Wildwood	46.3 ±5.0	7,107	2,499	2,573
7	63005	Chesterfield	45.6 ±2.2	19,779	7,134	7,509
8	63011	Ballwin	44.5 ±1.6	35,920	14,437	15,228
9	63129	Saint Louis	44.4 ±1.3	51,553	21,301	22,430
10	63069	Pacific	43.7 ±2.5	15,697	6,416	6,428
11	63044	Bridgeton	43.3 ±3.6	10,324	4,328	4,254
12	63049	High Ridge	43.2 ±2.2	16,592	6,458	6,906
13	63040	Wildwood	42.4 ±3.4	8,526	3,113	3,361
14	63122	Saint Louis	42.3 ±1.1	41,634	16,686	17,610
15	63034	Florissant	41.9 ±3.2	18,908	6,670	7,124
16	63026	Fenton	41.7 ±1.7	45,354	17,488	18,439
17	63141	Saint Louis	41.7 ±2.8	20,932	8,751	9,034
18	63119	Saint Louis	41.1 ±1.0	34,181	14,476	14,485
19	63126	Saint Louis	41.0 ±1.7	15,452	6,208	6,435
20	63123	Saint Louis	40.9 ±1.0	49,077	21,755	22,718
21	63021	Ballwin	40.7 ±1.3	55,666	22,131	22,762
22	63088	Valley Park	40.1 ±4.5	8,226	4,146	4,300
23	63033	Florissant	39.5 ±2.0	43,056	17,660	17,609
24	63132	Saint Louis	39.5 ±2.1	14,283	5,997	6,095
25	63025	Eureka	39.2 ±2.2	19,508	6,911	7,352

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; 44 of 46 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 44,481 households, on 115 carrier routes with 46,102 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 63127 on the EDDM route map

More rankings

Businesses that mail these ZIP codes

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Frequently asked questions

Which ZIP code in St. Louis County has the highest median age?: 63127 (Saint Louis), at 54.5 (±2.9), among 44 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.