Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — ZIP/78728

78728

ZIP 78728 is in Austin, Texas, mostly in Travis County; area codes 512 and 737; Central time. Austin has 74 ZIP codes in all.

Type
Standard
Time zone
America/Chicago
County
Travis +1 more
Population
26,777
Coordinates
30.4538, -97.6867
☼ Live from 78728 — Austin, TX

Weather right now

Asking the National Weather Service…

NEXRAD radar
Finding the nearest radar…
Local time: —

Where 78728 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.

★ Weird and wonderful facts about 78728
  • 🔢 Type 78728 into a pocket calculator and turn it upside down: BZLBL — not quite a word, sorry.
  • ➕ As a number, 78,728 = 2 × 2 × 2 × 13 × 757. Its digits add up to 32, a total 644 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10011001110001000
  • 🏠 Its numerical neighbours: 78727 (Austin, TX, 3 mi away) and 78729 (Austin, TX, 4 mi away).
  • 🔄 Backwards, 78728 becomes 82787, which is not a ZIP code at all.
  • 👥 11 other ZIP codes are made of exactly the same digits (27878, 27887, 28778, 28787, 77288, 77882, …). The farthest-flung twin is 27887 in Tillery, NC, 1,229 miles away.
  • 🧭 Farther south than 92% of all ZIP codes, and farther west than 76%.
  • 🎯650 miles south of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 78728 and you would come out at 30.45°S, 82.31°E — 1,450 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 7.7 square miles of land, 78728 is bigger than 24% of ZIP codes — room for about 5.9 Central Parks.
🌙 The sky over 78728 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population26,777This ZIP26,777
Households13,169This ZIP13,169
Housing units14,128This ZIP14,128
Median age33.9This ZIP33.9Texas35.6US 38.9
Median household income$75,243This ZIP$75,243Texas$78,476US $80,734
Median home value$437,000This ZIP$437,000Texas$283,800US $332,700
Median gross rent$1,632This ZIP$1,632Texas$1,403US $1,413
Bachelor's degree or higher47.7%This ZIP47.7%
Mean commute23.1 minThis ZIP23.1 min
Population density3,455.5 / sq miThis ZIP3,455.5 / sq mi

Business and tax activity

Business establishments631This ZIP631
Employees16,007This ZIP16,007
Annual payroll$1,089,778,000This ZIP$1,089,778,000
Tax returns filed12,780This ZIP12,780
Total adjusted gross income$950,271,000This ZIP$950,271,000

Land area

Land area7.75 sq miThis ZIP7.75 sq mi
Water area0.02 sq miThis ZIP0.02 sq mi

Counties 78728 spans

A ZIP code is a mail route and ignores county lines. Shares are by overlapping land area.

CountyShare of this ZIP
Travis County 78.3%
Williamson County 21.7%

Other place names in 78728

Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.

ZIP codes near 78728

ZIPCityDistance
78764 Austin, TX 1.7 mi
78727 Austin, TX 2.5 mi
78691 Pflugerville, TX 4.1 mi
78729 Austin, TX 4.2 mi
78664 Round Rock, TX 4.3 mi
78717 Austin, TX 4.7 mi
78758 Austin, TX 4.7 mi
78753 Austin, TX 4.9 mi
78660 Pflugerville, TX 5.6 mi
78759 Austin, TX 5.7 mi

Find every ZIP code within 10 miles of 78728 →

Questions about this ZIP code

Where is ZIP code 78728?

78728 is in Austin, Texas, in Travis County, part of the Austin-Round Rock-San Marcos, TX metropolitan area. Its published point location is 30.4538, -97.6867.

What county is 78728 in?

78728 spans 2 counties: Travis County and Williamson County. Most of it falls in Travis 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 78728?

Austin uses area codes 512 and 737, from NANPA's telephone records.

What time zone is 78728 in?

78728 uses America/Chicago.

How many people live in 78728?

About 26,777 people live in ZIP code 78728, in 13,169 households, at 3,455.5 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 78728?

$75,243 a year, against $78,476 across Texas.

What ZIP codes are near 78728?

The closest are 78764 (1.7 mi), 78727 (2.5 mi), 78691 (4.1 mi), 78729 (4.2 mi) and 78664 (4.3 mi).

Is 78728 a PO Box ZIP code?

78728 is a standard ZIP code. A normal ZIP code with street delivery.

Download or cite

Cite this page

zipcodes.pro. “78728 ZIP Code — Austin, Texas (Travis County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/78728

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/78728.json

Underlying data is public domain or openly licensed — sources, vintages and licences.