Which ZIP code in Williamson County has the fastest population growth?

76537 (Jarrell), at 181.4%, among 21 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 Williamson County, TX

These are the 21 ZIP codes in Williamson County with the fastest population growth, out of 21 with at least 1,000 residents. 76537 (Jarrell, 181.4%), 78642 (Liberty Hill, 113.8%) and 76527 (Florence, 65.6%) lead the list. There is no single "best" ZIP code in Williamson 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 Williamson County

Rank	ZIP	Mailing city	Population change	Residents	Households	Residential mailboxes
1	76537	Jarrell	181.4%	16,272	5,448	10,169
2	78642	Liberty Hill	113.8%	26,434	8,696	14,168
3	76527	Florence	65.6%	4,918	1,582	1,897
4	78628	Georgetown	42.8%	50,822	19,084	27,555
5	78641	Leander	38.6%	99,865	35,410	48,032
6	76530	Granger	38.6%	2,598	959	969
7	78665	Round Rock	34.8%	66,171	24,162	30,636
8	78634	Hutto	34.7%	46,413	15,808	21,724
9	78626	Georgetown	31.5%	48,072	16,813	23,417
10	78621	Elgin	27.1%	30,411	10,175	12,832
11	78728	Austin	26.8%	26,777	13,169	14,485
12	78717	Austin	21.5%	37,262	14,939	18,089
13	76578	Thrall	18.9%	1,762	571	721
14	78633	Georgetown	13.4%	29,309	14,245	18,369
15	78613	Cedar Park	9.8%	89,956	33,919	35,237
16	76511	Bartlett	7.9%	2,702	920	859
17	78729	Austin	6.3%	30,460	14,500	15,015
18	76574	Taylor	5.6%	20,242	7,752	8,408
19	78681	Round Rock	-2.5%	56,691	20,135	21,501
20	78664	Round Rock	-4.1%	62,060	23,484	23,993
21	78750	Austin	-7.7%	29,277	11,875	11,595

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; 21 of 24 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 70,220 households, on 115 carrier routes with 101,821 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 76537 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 Williamson County has the fastest population growth?: 76537 (Jarrell), at 181.4%, among 21 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.