Which ZIP code in Travis County has the highest median age?

78645 (Leander), at 54.4 (±1.8), among 54 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.

Oldest ZIP codes in Travis County, TX

These are the 25 ZIP codes in Travis County with the highest median age, out of 54 with at least 1,000 residents. 78645 (Leander, 54.4), 78734 (Austin, 49.0) and 78669 (Spicewood, 47.0) lead the list. There is no single "best" ZIP code in Travis County; the right one depends on who you want to reach, so the same ZIP codes are ranked several ways below.

Oldest ZIP codes in Travis County

Rank	ZIP	Mailing city	Median age	Residents	Households	Residential mailboxes
1	78645	Leander	54.4 ±1.8	15,256	7,048	8,763
2	78734	Austin	49.0 ±2.9	22,145	9,881	10,877
3	78669	Spicewood	47.0 ±2.8	12,592	5,056	6,268
4	78719	Austin	45.5 ±5.1	1,796	585	520
5	78746	Austin	44.0 ±1.4	28,256	11,202	12,205
6	78733	Austin	43.7 ±1.6	9,029	3,171	3,393
7	78738	Austin	43.4 ±1.1	31,019	12,063	14,520
8	78736	Austin	42.9 ±5.0	9,651	4,443	4,917
9	78730	Austin	42.9 ±5.2	9,142	4,090	4,400
10	78654	Marble Falls	42.7 ±3.3	20,650	8,362	10,341
11	78731	Austin	42.3 ±2.1	27,507	14,343	14,270
12	78701	Austin	42.0 ±3.5	11,824	7,949	13,153
13	78652	Manchaca	41.8 ±3.8	5,287	1,869	3,196
14	78749	Austin	41.3 ±2.3	34,562	15,989	15,803
15	78750	Austin	41.3 ±1.7	29,277	11,875	11,595
16	78739	Austin	41.1 ±1.7	20,659	7,090	7,177
17	78703	Austin	40.7 ±2.2	23,483	11,375	11,625
18	78737	Austin	39.5 ±1.7	27,023	9,145	9,330
19	78757	Austin	39.1 ±1.0	23,856	11,335	12,472
20	78759	Austin	38.5 ±1.3	43,182	21,985	22,433
21	78735	Austin	38.3 ±1.3	20,996	9,791	11,092
22	78613	Cedar Park	37.7 ±0.8	89,956	33,919	35,237
23	78732	Austin	37.7 ±2.1	21,087	7,580	6,856
24	78745	Austin	37.1 ±1.2	61,219	30,293	32,889
25	78641	Leander	37.0 ±0.7	99,865	35,410	48,032

How we ranked them

Ranked by median age of all residents, highest first (ACS 5-year estimates, 2020–2024). ZIP codes need at least 1,000 residents to be ranked; 54 of 56 qualify.

Which of these to mail, and why

Older ZIP codes respond to health care, hearing and vision, Medicare plans, home safety, estate planning and services that come to the door.

The top five ZIP codes on this list hold 33,772 households, on 74 carrier routes with 38,633 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 78645 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 Travis County has the highest median age?: 78645 (Leander), at 54.4 (±1.8), among 54 ZIP codes with at least 1,000 residents.
How is this ranking calculated?: Ranked by median age of all residents, highest first (ACS 5-year estimates, 2020–2024).
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.