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

63070 (Pevely), at 33.4 (±2.1), 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.

Youngest ZIP codes in Jefferson County, MO

These are the 17 ZIP codes in Jefferson County with the lowest median age, out of 17 with at least 1,000 residents. 63070 (Pevely, 33.4), 63012 (Barnhart, 38.7) and 63028 (Festus, 38.8) 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.

Youngest ZIP codes in Jefferson County

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

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; 17 of 19 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 35,653 households, on 65 carrier routes with 38,600 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 63070 on the EDDM route map

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Frequently asked questions

Which ZIP code in Jefferson County has the lowest median age?: 63070 (Pevely), at 33.4 (±2.1), among 17 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.