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

63348 (Foristell), at 36.7%, among 11 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. Charles County, MO

These are the 11 ZIP codes in St. Charles County with the fastest population growth, out of 11 with at least 1,000 residents. 63348 (Foristell, 36.7%), 63332 (Augusta, 34.1%) and 63367 (Lake Saint Louis, 17.6%) lead the list. There is no single "best" ZIP code in St. Charles 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. Charles County

Rank	ZIP	Mailing city	Population change	Residents	Households	Residential mailboxes
1	63348	Foristell	36.7%	10,394	3,781	3,253
2	63332	Augusta	34.1%	1,651	616	625
3	63367	Lake Saint Louis	17.6%	29,725	11,125	12,642
4	63385	Wentzville	14.5%	51,330	18,106	21,803
5	63366	O Fallon	8.7%	54,769	20,967	21,505
6	63304	Saint Charles	4.8%	43,195	16,284	17,988
7	63301	Saint Charles	2.9%	52,667	21,462	23,411
8	63368	O Fallon	2.8%	46,966	17,271	18,325
9	63376	Saint Peters	-0.6%	74,962	30,034	31,724
10	63341	Defiance	-2.2%	3,515	1,324	1,558
11	63303	Saint Charles	-4.7%	46,089	20,690	21,072

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; 11 of 14 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 54,595 households, on 93 carrier routes with 59,828 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 63348 on the EDDM route map

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Frequently asked questions

Which ZIP code in St. Charles County has the fastest population growth?: 63348 (Foristell), at 36.7%, among 11 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.