Which ZIP code in Williamson County has the highest share of residents who moved in during the past year?

78665 (Round Rock), at 22.8%, among 22 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.

ZIP codes with the most new movers in Williamson County, TX

These are the 22 ZIP codes in Williamson County with the highest share of residents who moved in during the past year, out of 22 with at least 1,000 residents. 78665 (Round Rock, 22.8%), 78626 (Georgetown, 22.2%) and 78717 (Austin, 20.9%) 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.

ZIP codes with the most new movers in Williamson County

Rank	ZIP	Mailing city	Moved in the past year	Residents	Households	Residential mailboxes
1	78665	Round Rock	22.8%	66,171	24,162	30,636
2	78626	Georgetown	22.2%	48,072	16,813	23,417
3	78717	Austin	20.9%	37,262	14,939	18,089
4	78728	Austin	19.7%	26,777	13,169	14,485
5	78729	Austin	17.8%	30,460	14,500	15,015
6	78664	Round Rock	17.2%	62,060	23,484	23,993
7	78641	Leander	16.2%	99,865	35,410	48,032
8	76537	Jarrell	15.0%	16,272	5,448	10,169
9	78628	Georgetown	14.7%	50,822	19,084	27,555
10	78642	Liberty Hill	13.8%	26,434	8,696	14,168
11	78634	Hutto	13.5%	46,413	15,808	21,724
12	76578	Thrall	13.2%	1,762	571	721
13	78613	Cedar Park	12.7%	89,956	33,919	35,237
14	78750	Austin	12.5%	29,277	11,875	11,595
15	78633	Georgetown	12.0%	29,309	14,245	18,369
16	78681	Round Rock	11.6%	56,691	20,135	21,501
17	76511	Bartlett	10.7%	2,702	920	859
18	76574	Taylor	10.1%	20,242	7,752	8,408
19	78621	Elgin	9.4%	30,411	10,175	12,832
20	76530	Granger	7.4%	2,598	959	969
21	76527	Florence	4.4%	4,918	1,582	1,897
22	78615	Coupland	2.7%	1,637	549	666

How we ranked them

Ranked by the share of residents (age 1 and over) who lived in a different home a year earlier (ACS Data Profile, 2020–2024). No margin of error is published for this share in our files. ZIP codes need at least 1,000 residents to be ranked; 22 of 24 qualify.

Which of these to mail, and why

New residents are still choosing a dentist, a gym, a pizza place and a lawn service. ZIP codes with high turnover give a welcome offer more people to work on each year.

The top five ZIP codes on this list hold 83,583 households, on 106 carrier routes with 101,642 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 78665 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 highest share of residents who moved in during the past year?: 78665 (Round Rock), at 22.8%, among 22 ZIP codes with at least 1,000 residents.
How is this ranking calculated?: Ranked by the share of residents (age 1 and over) who lived in a different home a year earlier (ACS Data Profile, 2020–2024). No margin of error is published for this share in our files.
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.