Which ZIP code in Williamson County has the highest median household income?

78717 (Austin), at $145,325 (±$6,378), 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.

Richest ZIP codes in Williamson County, TX

These are the 22 ZIP codes in Williamson County with the highest median household income, out of 22 with at least 1,000 residents. 78717 (Austin, $145,325), 78681 (Round Rock, $137,819) and 78641 (Leander, $135,024) 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.

Richest ZIP codes in Williamson County

Rank	ZIP	Mailing city	Median household income	Residents	Households	Residential mailboxes
1	78717	Austin	$145,325 ±$6,378	37,262	14,939	18,089
2	78681	Round Rock	$137,819 ±$8,741	56,691	20,135	21,501
3	78641	Leander	$135,024 ±$5,883	99,865	35,410	48,032
4	78642	Liberty Hill	$132,958 ±$13,118	26,434	8,696	14,168
5	78628	Georgetown	$125,635 ±$6,672	50,822	19,084	27,555
6	78613	Cedar Park	$125,487 ±$8,472	89,956	33,919	35,237
7	78665	Round Rock	$122,680 ±$7,223	66,171	24,162	30,636
8	78750	Austin	$121,563 ±$14,951	29,277	11,875	11,595
9	78634	Hutto	$114,426 ±$6,370	46,413	15,808	21,724
10	76530	Granger	$106,250 ±$24,444	2,598	959	969
11	76578	Thrall	$105,063 ±$29,909	1,762	571	721
12	78633	Georgetown	$100,936 ±$4,449	29,309	14,245	18,369
13	78626	Georgetown	$100,431 ±$5,018	48,072	16,813	23,417
14	78621	Elgin	$98,534 ±$7,172	30,411	10,175	12,832
15	76537	Jarrell	$98,199 ±$5,032	16,272	5,448	10,169
16	78664	Round Rock	$87,417 ±$6,353	62,060	23,484	23,993
17	78729	Austin	$86,438 ±$6,660	30,460	14,500	15,015
18	76527	Florence	$81,574 ±$15,622	4,918	1,582	1,897
19	78615	Coupland	$80,938 ±$35,225	1,637	549	666
20	76574	Taylor	$78,568 ±$8,127	20,242	7,752	8,408
21	78728	Austin	$75,243 ±$5,752	26,777	13,169	14,485
22	76511	Bartlett	$69,286 ±$15,267	2,702	920	859

How we ranked them

Ranked by median household income (ACS 5-year estimates, 2020–2024). The Census Bureau caps published medians at $250,000; ZIP codes at the cap are shown as $250,000+ and ordered by population. ZIP codes need at least 1,000 residents to be ranked; 22 of 24 qualify.

Which of these to mail, and why

Higher-income ZIP codes suit offers with a bigger ticket: remodeling, pools, roofing, financial planning, private schools, premium dining. A median describes the middle household, not every door, so the routes inside each ZIP still vary.

The top five ZIP codes on this list hold 98,264 households, on 147 carrier routes with 129,345 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 78717 on the EDDM route map

More rankings

Businesses that mail these ZIP codes

Map it and price it

EDDM guides

Frequently asked questions

Which ZIP code in Williamson County has the highest median household income?: 78717 (Austin), at $145,325 (±$6,378), among 22 ZIP codes with at least 1,000 residents.
How is this ranking calculated?: Ranked by median household income (ACS 5-year estimates, 2020–2024). The Census Bureau caps published medians at $250,000; ZIP codes at the cap are shown as $250,000+ and ordered by population.
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.