78729
ZIP 78729 is in Austin, Texas, mostly in Williamson County; area codes 512 and 737; Central time. Austin has 74 ZIP codes in all.
- Type
- Standard
- Time zone
- America/Chicago
- County
- Williamson +1 more
- Metro area
- Austin-Round Rock-San Marcos, TX
- Population
- 30,460
- Coordinates
- 30.4572, -97.7564
Weather right now
Asking the National Weather Service…
Where 78729 is
Approximate ZIP boundary (Census ZCTA 2020). ZIP codes are mail routes, not areas, so the shape shown is the Census tabulation area that approximates it.
- 🔢 Type 78729 into a pocket calculator and turn it upside down: GZLBL — not quite a word, sorry.
- ➕ As a number, 78,729 = 3 × 7 × 23 × 163. Its digits add up to 33, a total 456 other ZIP codes share.
- 💾In binary, the way a computer stores it:
10011001110001001 - 🏠 Its numerical neighbours: 78728 (Austin, TX, 4 mi away) and 78730 (Austin, TX, 8 mi away).
- 🔄 Backwards, 78729 becomes 92787, which is not a ZIP code at all.
- 👥 13 other ZIP codes are made of exactly the same digits (27879, 27897, 27978, 28779, 77289, 77982, …). The farthest-flung twin is 98277 in Oak Harbor, WA, 1,798 miles away.
- 🧭 Farther south than 92% of all ZIP codes, and farther west than 76%.
- 🎯649 miles south of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 78729 and you would come out at 30.46°S, 82.24°E — 1,448 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
- ☀Longest day of the year: 14h 07m of daylight. Shortest: 10h 11m.
- 📏 At 9.8 square miles of land, 78729 is bigger than 27% of ZIP codes — room for about 7.4 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 30,460This ZIP30,460 |
|---|---|
| Households | 14,500This ZIP14,500 |
| Housing units | 15,466This ZIP15,466 |
| Median age | 34.9This ZIP34.9Texas35.6US 38.9 |
| Median household income | $86,438This ZIP$86,438Texas$78,476US $80,734 |
| Median home value | $476,200This ZIP$476,200Texas$283,800US $332,700 |
| Median gross rent | $1,678This ZIP$1,678Texas$1,403US $1,413 |
| Bachelor's degree or higher | 62.5%This ZIP62.5% |
| Mean commute | 24.8 minThis ZIP24.8 min |
| Population density | 3,104.4 / sq miThis ZIP3,104.4 / sq mi |
Business and tax activity
| Business establishments | 595This ZIP595 |
|---|---|
| Employees | 13,417This ZIP13,417 |
| Annual payroll | $1,226,472,000This ZIP$1,226,472,000 |
| Tax returns filed | 14,830This ZIP14,830 |
| Total adjusted gross income | $1,315,602,000This ZIP$1,315,602,000 |
Land area
| Land area | 9.81 sq miThis ZIP9.81 sq mi |
|---|---|
| Water area | 0.05 sq miThis ZIP0.05 sq mi |
Counties 78729 spans
A ZIP code is a mail route and ignores county lines. Shares are by overlapping land area.
| County | Share of this ZIP |
|---|---|
| Williamson County | 88.3% |
| Travis County | 11.7% |
Other place names in 78729
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 78729
| ZIP | City | Distance |
|---|---|---|
78750 | Austin, TX | 2.1 mi |
78717 | Austin, TX | 2.2 mi |
78727 | Austin, TX | 3.0 mi |
78759 | Austin, TX | 3.8 mi |
78728 | Austin, TX | 4.2 mi |
78630 | Cedar Park, TX | 5.0 mi |
78613 | Cedar Park, TX | 5.1 mi |
78726 | Austin, TX | 5.3 mi |
78758 | Austin, TX | 5.6 mi |
78764 | Austin, TX | 5.8 mi |
Find every ZIP code within 10 miles of 78729 →
Questions about this ZIP code
Where is ZIP code 78729?
78729 is in Austin, Texas, in Williamson County, part of the Austin-Round Rock-San Marcos, TX metropolitan area. Its published point location is 30.4572, -97.7564.
What county is 78729 in?
78729 spans 2 counties: Williamson County and Travis County. Most of it falls in Williamson County, measured by overlapping land area — the county holding the most land in a ZIP code is not always the one holding the most residents.
What area code is 78729?
Austin uses area codes 512 and 737, from NANPA's telephone records.
What time zone is 78729 in?
78729 uses America/Chicago.
How many people live in 78729?
About 30,460 people live in ZIP code 78729, in 14,500 households, at 3,104.4 people per square mile. These are American Community Survey 5-year estimates for the ZIP Code Tabulation Area, not a headcount.
What is the median household income in 78729?
$86,438 a year, against $78,476 across Texas.
What ZIP codes are near 78729?
The closest are 78750 (2.1 mi), 78717 (2.2 mi), 78727 (3 mi), 78759 (3.8 mi) and 78728 (4.2 mi).
Is 78729 a PO Box ZIP code?
78729 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “78729 ZIP Code — Austin, Texas (Williamson County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/78729
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/78729.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.