Which ZIP code in Contra Costa County has the fastest population growth?

94514 (Byron), at 32.4%, among 42 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.

Fastest-growing ZIP codes in Contra Costa County, CA

These are the 25 ZIP codes in Contra Costa County with the fastest population growth, out of 42 with at least 1,000 residents. 94514 (Byron, 32.4%), 94583 (San Ramon, 12.4%) and 94582 (San Ramon, 11.4%) 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.

Fastest-growing ZIP codes in Contra Costa County

Rank	ZIP	Mailing city	Population change	Residents	Households	Residential mailboxes
1	94514	Byron	32.4%	1,953	576	218
2	94583	San Ramon	12.4%	39,583	13,890	14,426
3	94582	San Ramon	11.4%	47,424	16,466	16,067
4	94804	Richmond	9.7%	44,891	16,250	15,613
5	94561	Oakley	9.2%	46,368	14,105	15,581
6	94707	Berkeley	8.9%	12,811	5,267	5,191
7	94513	Brentwood	8.5%	69,755	22,390	23,743
8	95219	Stockton	8.3%	31,713	11,517	12,387
9	94596	Walnut Creek	7.9%	23,417	11,009	11,719
10	94531	Antioch	7.8%	46,387	13,905	15,350
11	94801	Richmond	7.6%	33,591	10,593	10,417
12	94506	Danville	7.2%	27,055	9,185	8,802
13	94803	El Sobrante	6.8%	27,659	9,562	9,620
14	94708	Berkeley	4.9%	11,947	4,800	4,846
15	94805	Richmond	3.4%	14,670	5,493	5,258
16	94565	Pittsburg	2.9%	100,488	30,537	32,143
17	94509	Antioch	2.8%	70,090	23,476	23,386
18	94547	Hercules	2.7%	26,302	9,355	9,220
19	94525	Crockett	2.5%	3,372	1,539	1,621
20	94530	El Cerrito	1.0%	26,401	11,021	11,153
21	94597	Walnut Creek	0.1%	23,129	10,782	11,701
22	94523	Pleasant Hill	-1.2%	34,592	13,452	14,705
23	94563	Orinda	-1.4%	19,378	7,218	7,247
24	94526	Danville	-1.7%	32,584	11,843	12,489
25	94598	Walnut Creek	-2.2%	27,206	10,828	10,876

How we ranked them

Ranked by the change in ACS population estimates between the 2015–2019 and 2020–2024 releases. Both are 5-year averages, and ZIP code areas were redrawn for 2020, so a large change can partly reflect a boundary change. Both periods must have at least 1,000 residents. ZIP codes need at least 1,000 residents to be ranked; 42 of 47 qualify.

Which of these to mail, and why

Growing ZIP codes add households every year, which means new homes, new routes and customers without a go-to provider yet. Check the route map: new subdivisions can appear as new carrier routes.

The top five ZIP codes on this list hold 61,287 households, on 94 carrier routes with 61,905 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 94514 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 Contra Costa County has the fastest population growth?: 94514 (Byron), at 32.4%, among 42 ZIP codes with at least 1,000 residents.
How is this ranking calculated?: Ranked by the change in ACS population estimates between the 2015–2019 and 2020–2024 releases. Both are 5-year averages, and ZIP code areas were redrawn for 2020, so a large change can partly reflect a boundary change. Both periods must have 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.

This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.