Which ZIP code in St. Louis County has the fastest population growth?

63025 (Eureka), at 32.3%, 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.

Fastest-growing ZIP codes in St. Louis County, MO

These are the 25 ZIP codes in St. Louis County with the fastest population growth, out of 44 with at least 1,000 residents. 63025 (Eureka, 32.3%), 63005 (Chesterfield, 9.4%) and 63144 (Saint Louis, 9.1%) 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.

Fastest-growing ZIP codes in St. Louis County

Rank	ZIP	Mailing city	Population change	Residents	Households	Residential mailboxes
1	63025	Eureka	32.3%	19,508	6,911	7,352
2	63005	Chesterfield	9.4%	19,779	7,134	7,509
3	63144	Saint Louis	9.1%	9,505	4,769	4,919
4	63132	Saint Louis	6.8%	14,283	5,997	6,095
5	63122	Saint Louis	6.3%	41,634	16,686	17,610
6	63121	Saint Louis	6.1%	25,008	11,142	10,903
7	63069	Pacific	5.5%	15,697	6,416	6,428
8	63126	Saint Louis	5.5%	15,452	6,208	6,435
9	63031	Florissant	5.1%	50,196	19,408	19,166
10	63017	Chesterfield	4.8%	43,243	17,957	18,881
11	63034	Florissant	4.7%	18,908	6,670	7,124
12	63127	Saint Louis	4.5%	5,268	2,149	2,378
13	63074	Saint Ann	3.0%	15,793	6,976	6,926
14	63141	Saint Louis	2.6%	20,932	8,751	9,034
15	63026	Fenton	2.3%	45,354	17,488	18,439
16	63117	Saint Louis	2.1%	9,261	4,440	5,025
17	63040	Wildwood	1.8%	8,526	3,113	3,361
18	63128	Saint Louis	1.7%	30,540	13,032	13,196
19	63105	Saint Louis	1.6%	18,875	7,088	7,515
20	63038	Wildwood	1.6%	7,107	2,499	2,573
21	63125	Saint Louis	1.4%	33,294	13,820	14,726
22	63033	Florissant	1.2%	43,056	17,660	17,609
23	63130	Saint Louis	0.6%	28,910	12,580	12,990
24	63124	Saint Louis	0.6%	10,839	4,832	5,165
25	63146	Saint Louis	0.5%	30,678	14,551	15,543

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; 44 of 46 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 41,497 households, on 118 carrier routes with 43,485 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 63025 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 fastest population growth?: 63025 (Eureka), at 32.3%, among 44 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.