Which ZIP code in Contra Costa County has the lowest median age?

94801 (Richmond), at 34.7 (±1.4), among 43 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 Contra Costa County, CA

These are the 25 ZIP codes in Contra Costa County with the lowest median age, out of 43 with at least 1,000 residents. 94801 (Richmond, 34.7), 94520 (Concord, 35.0) and 94565 (Pittsburg, 35.4) lead the list. There is no single "best" ZIP code in Contra Costa 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 Contra Costa County

Rank	ZIP	Mailing city	Median age	Residents	Households	Residential mailboxes
1	94801	Richmond	34.7 ±1.4	33,591	10,593	10,417
2	94520	Concord	35.0 ±1.2	37,381	13,721	14,012
3	94565	Pittsburg	35.4 ±1.1	100,488	30,537	32,143
4	94561	Oakley	36.4 ±0.8	46,368	14,105	15,581
5	94806	San Pablo	36.7 ±1.5	62,546	20,538	20,522
6	94804	Richmond	36.9 ±1.3	44,891	16,250	15,613
7	94596	Walnut Creek	37.1 ±1.6	23,417	11,009	11,719
8	95219	Stockton	37.4 ±2.2	31,713	11,517	12,387
9	94509	Antioch	38.1 ±1.3	70,090	23,476	23,386
10	94531	Antioch	38.8 ±2.0	46,387	13,905	15,350
11	94597	Walnut Creek	39.1 ±2.5	23,129	10,782	11,701
12	94551	Livermore	39.7 ±1.0	37,885	14,052	14,716
13	94513	Brentwood	40.0 ±1.0	69,755	22,390	23,743
14	94519	Concord	40.1 ±1.6	19,058	7,043	7,200
15	94583	San Ramon	40.8 ±1.2	39,583	13,890	14,426
16	94518	Concord	41.2 ±2.4	27,345	10,124	10,470
17	94588	Pleasanton	41.3 ±0.9	34,328	12,465	12,794
18	94530	El Cerrito	41.8 ±1.4	26,401	11,021	11,153
19	94572	Rodeo	41.8 ±2.5	8,976	3,015	3,086
20	94523	Pleasant Hill	42.0 ±1.1	34,592	13,452	14,705
21	94582	San Ramon	42.3 ±1.1	47,424	16,466	16,067
22	94803	El Sobrante	42.3 ±2.0	27,659	9,562	9,620
23	94556	Moraga	42.4 ±1.7	15,998	5,614	6,003
24	94553	Martinez	42.6 ±1.0	48,643	19,141	20,109
25	94521	Concord	42.9 ±1.3	41,909	15,938	16,116

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; 43 of 47 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 89,494 households, on 141 carrier routes with 92,675 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 94801 on the EDDM route map

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Frequently asked questions

Which ZIP code in Contra Costa County has the lowest median age?: 94801 (Richmond), at 34.7 (±1.4), among 43 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.