78661
ZIP 78661 is Prairie Lea, Texas, in Caldwell County; Central time.
- Type
- Standard
- Time zone
- America/Chicago
- County
- Caldwell
- Metro area
- Austin-Round Rock-San Marcos, TX
- Population
- 835
- Coordinates
- 29.7219, -97.7589
Weather right now
Asking the National Weather Service…
Where 78661 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 78661 into a pocket calculator and turn it upside down: IggBL — not quite a word, sorry.
- ➕ As a number, 78,661 = 11 × 7151. Its digits add up to 28, a total 1,520 other ZIP codes share.
- 💾In binary, the way a computer stores it:
10011001101000101 - 🏠 Its numerical neighbours: 78660 (Pflugerville, TX, 51 mi away) and 78662 (Red Rock, TX, 24 mi away).
- 🔄 Backwards, 78661 becomes 16687, which is not a ZIP code at all.
- 👥 15 other ZIP codes are made of exactly the same digits (16678, 16876, 17866, 18766, 61876, 66781, …). The farthest-flung twin is 18766 in Wilkes Barre, PA, 1,459 miles away.
- 🧭 Farther south than 94% of all ZIP codes, and farther west than 76%.
- 🎯700 miles south of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 78661 and you would come out at 29.72°S, 82.24°E — 1,495 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
- ☀Longest day of the year: 14h 03m of daylight. Shortest: 10h 14m.
- 📏 At 4.1 square miles of land, 78661 is bigger than 17% of ZIP codes — room for about 3.1 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 835This ZIP835 |
|---|---|
| Households | 233This ZIP233 |
| Housing units | 241This ZIP241 |
| Median age | 27.1This ZIP27.1Texas35.6US 38.9 |
| Median household income | $82,896This ZIP$82,896Texas$78,476US $80,734 |
| Median home value | $209,700This ZIP$209,700Texas$283,800US $332,700 |
| Bachelor's degree or higher | 9.0%This ZIP9.0% |
| Mean commute | 36.8 minThis ZIP36.8 min |
| Population density | 202.5 / sq miThis ZIP202.5 / sq mi |
Business and tax activity
| Business establishments | 8This ZIP8 |
|---|---|
| Employees | 38This ZIP38 |
| Annual payroll | $2,752,000This ZIP$2,752,000 |
Land area
| Land area | 4.12 sq miThis ZIP4.12 sq mi |
|---|---|
| Water area | 0.08 sq miThis ZIP0.08 sq mi |
ZIP codes near 78661
| ZIP | City | Distance |
|---|---|---|
78622 | Fentress, TX | 4.4 mi |
78638 | Kingsbury, TX | 4.6 mi |
78670 | Staples, TX | 6.1 mi |
78648 | Luling, TX | 7.5 mi |
78655 | Martindale, TX | 7.9 mi |
78644 | Lockhart, TX | 11.6 mi |
78658 | Ottine, TX | 12.0 mi |
78656 | Maxwell, TX | 12.9 mi |
78604 | Belmont, TX | 14.4 mi |
78156 | Seguin, TX | 14.8 mi |
Find every ZIP code within 10 miles of 78661 →
Questions about this ZIP code
Where is ZIP code 78661?
78661 is in Prairie Lea, Texas, in Caldwell County, part of the Austin-Round Rock-San Marcos, TX metropolitan area. Its published point location is 29.7219, -97.7589.
What county is 78661 in?
78661 lies in Caldwell County.
What time zone is 78661 in?
78661 uses America/Chicago.
How many people live in 78661?
About 835 people live in ZIP code 78661, in 233 households, at 202.5 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 78661?
$82,896 a year, against $78,476 across Texas.
What ZIP codes are near 78661?
The closest are 78622 (4.4 mi), 78638 (4.6 mi), 78670 (6.1 mi), 78648 (7.5 mi) and 78655 (7.9 mi).
Is 78661 a PO Box ZIP code?
78661 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “78661 ZIP Code — Prairie Lea, Texas (Caldwell County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/78661
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/78661.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.