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Where 78155 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 78155 into a pocket calculator and turn it upside down: SSIBL — not quite a word, sorry.
- ➕ As a number, 78,155 = 5 × 7 × 7 × 11 × 29. Its digits add up to 26, a total 2,038 other ZIP codes share.
- 💾In binary, the way a computer stores it:
10011000101001011 - 🏠 Its numerical neighbours: 78154 (Schertz, TX, 20 mi away) and 78156 (Seguin, TX, 6 mi away).
- 🔄 Backwards, 78155 becomes 55187 — and that is a real ZIP code: Saint Paul, MN, 1,101 miles away.
- 👥 18 other ZIP codes are made of exactly the same digits (15758, 15857, 17585, 17855, 51578, 55187, …). The farthest-flung twin is 17585 in Witmer, PA, 1,425 miles away.
- 🧭 Farther south than 94% of all ZIP codes, and farther west than 77%.
- 🎯712 miles south of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 78155 and you would come out at 29.54°S, 82.06°E — 1,503 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
- ☀Longest day of the year: 14h 02m of daylight. Shortest: 10h 15m.
- 📏 At 355.5 square miles of land, 78155 is bigger than 96% of ZIP codes — room for about 270 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 55,600This ZIP55,600 |
|---|---|
| Households | 21,007This ZIP21,007 |
| Housing units | 22,688This ZIP22,688 |
| Median age | 39.4This ZIP39.4Texas35.6US 38.9 |
| Median household income | $71,039This ZIP$71,039Texas$78,476US $80,734 |
| Median home value | $266,700This ZIP$266,700Texas$283,800US $332,700 |
| Median gross rent | $1,198This ZIP$1,198Texas$1,403US $1,413 |
| Bachelor's degree or higher | 21.7%This ZIP21.7% |
| Mean commute | 26.5 minThis ZIP26.5 min |
| Population density | 156.4 / sq miThis ZIP156.4 / sq mi |
Business and tax activity
| Business establishments | 1,065This ZIP1,065 |
|---|---|
| Employees | 20,490This ZIP20,490 |
| Annual payroll | $1,195,648,000This ZIP$1,195,648,000 |
| Tax returns filed | 26,050This ZIP26,050 |
| Total adjusted gross income | $1,837,408,000This ZIP$1,837,408,000 |
Land area
| Land area | 355.46 sq miThis ZIP355.46 sq mi |
|---|---|
| Water area | 1.48 sq miThis ZIP1.48 sq mi |
Other place names in 78155
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 78155
| ZIP | City | Distance |
|---|---|---|
78156 | Seguin, TX | 5.5 mi |
78115 | Geronimo, TX | 6.3 mi |
78123 | Mc Queeney, TX | 7.7 mi |
78638 | Kingsbury, TX | 12.4 mi |
78124 | Marion, TX | 12.7 mi |
78130 | New Braunfels, TX | 13.4 mi |
78122 | Leesville, TX | 14.8 mi |
78604 | Belmont, TX | 15.2 mi |
78121 | La Vernia, TX | 15.8 mi |
78131 | New Braunfels, TX | 16.1 mi |
Find every ZIP code within 10 miles of 78155 →
Questions about this ZIP code
Where is ZIP code 78155?
78155 is in Seguin, Texas, in Guadalupe County, part of the San Antonio-New Braunfels, TX metropolitan area. Its published point location is 29.5375, -97.9366.
What county is 78155 in?
78155 lies in Guadalupe County.
What area code is 78155?
Seguin uses area code 830, from NANPA's telephone records.
What time zone is 78155 in?
78155 uses America/Chicago.
How many people live in 78155?
About 55,600 people live in ZIP code 78155, in 21,007 households, at 156.4 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 78155?
$71,039 a year, against $78,476 across Texas.
What ZIP codes are near 78155?
The closest are 78156 (5.5 mi), 78115 (6.3 mi), 78123 (7.7 mi), 78638 (12.4 mi) and 78124 (12.7 mi).
Is 78155 a PO Box ZIP code?
78155 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “78155 ZIP Code — Seguin, Texas (Guadalupe County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/78155
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/78155.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.