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

63015 (Catawissa), at 49.9 (±18.2), among 17 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 Jefferson County, MO

These are the 17 ZIP codes in Jefferson County with the highest median age, out of 17 with at least 1,000 residents. 63015 (Catawissa, 49.9), 63016 (Cedar Hill, 46.6) and 63069 (Pacific, 43.7) lead the list. There is no single "best" ZIP code in Jefferson 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 Jefferson County

Rank	ZIP	Mailing city	Median age	Residents	Households	Residential mailboxes
1	63015	Catawissa	49.9 ±18.2	1,939	706	878
2	63016	Cedar Hill	46.6 ±2.7	6,459	2,682	3,317
3	63069	Pacific	43.7 ±2.5	15,697	6,416	6,428
4	63049	High Ridge	43.2 ±2.2	16,592	6,458	6,906
5	63020	De Soto	42.9 ±3.5	20,166	7,989	8,661
6	63048	Herculaneum	42.7 ±3.8	4,228	1,611	1,762
7	63019	Crystal City	42.3 ±4.9	4,489	1,836	1,866
8	63026	Fenton	41.7 ±1.7	45,354	17,488	18,439
9	63051	House Springs	40.9 ±3.4	13,436	5,027	5,942
10	63010	Arnold	40.3 ±2.2	34,478	13,885	14,513
11	63023	Dittmer	39.8 ±4.4	5,002	1,895	1,892
12	63050	Hillsboro	39.7 ±3.9	18,744	6,555	6,565
13	63052	Imperial	39.4 ±1.8	28,712	10,659	11,632
14	63025	Eureka	39.2 ±2.2	19,508	6,911	7,352
15	63028	Festus	38.8 ±1.9	28,457	11,061	12,107
16	63012	Barnhart	38.7 ±2.9	10,314	3,857	4,141
17	63070	Pevely	33.4 ±2.1	8,428	3,165	3,368

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; 17 of 19 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 24,251 households, on 46 carrier routes with 26,190 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 63015 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 Jefferson County has the highest median age?: 63015 (Catawissa), at 49.9 (±18.2), among 17 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.