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Where 78631 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 78631 into a pocket calculator and turn it upside down: IEgBL — not quite a word, sorry.
- ➕ As a number, 78,631 = 7 × 47 × 239. Its digits add up to 25, a total 2,242 other ZIP codes share.
- 💾In binary, the way a computer stores it:
10011001100100111 - 🏠 Its numerical neighbours: 78630 (Cedar Park, TX, 89 mi away) and 78632 (Harwood, TX, 119 mi away).
- 🔄 Backwards, 78631 becomes 13687 — and that is a real ZIP code: South Colton, NY, 1,649 miles away.
- 👥 43 other ZIP codes are made of exactly the same digits (13678, 13687, 13786, 16738, 16837, 16873, …). The farthest-flung twin is 13678 in Raymondville, NY, 1,656 miles away.
- 🧭 Farther south than 92% of all ZIP codes, and farther west than 79%.
- 🎯657 miles south of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 78631 and you would come out at 30.34°S, 80.69°E — 1,423 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
- ☀Longest day of the year: 14h 06m of daylight. Shortest: 10h 11m.
- 📏 At 299.8 square miles of land, 78631 is bigger than 95% of ZIP codes — room for about 228 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 3,465This ZIP3,465 |
|---|---|
| Households | 1,269This ZIP1,269 |
| Housing units | 1,571This ZIP1,571 |
| Median age | 43.4This ZIP43.4Texas35.6US 38.9 |
| Median household income | $78,560This ZIP$78,560Texas$78,476US $80,734 |
| Median home value | $351,600This ZIP$351,600Texas$283,800US $332,700 |
| Median gross rent | $1,304This ZIP$1,304Texas$1,403US $1,413 |
| Bachelor's degree or higher | 24.0%This ZIP24.0% |
| Mean commute | 29.9 minThis ZIP29.9 min |
| Population density | 11.6 / sq miThis ZIP11.6 / sq mi |
Business and tax activity
| Business establishments | 54This ZIP54 |
|---|---|
| Employees | 194This ZIP194 |
| Annual payroll | $7,170,000This ZIP$7,170,000 |
| Tax returns filed | 1,490This ZIP1,490 |
| Total adjusted gross income | $116,321,000This ZIP$116,321,000 |
Land area
| Land area | 299.77 sq miThis ZIP299.77 sq mi |
|---|---|
| Water area | 0.17 sq miThis ZIP0.17 sq mi |
Counties 78631 spans
A ZIP code is a mail route and ignores county lines. Shares are by overlapping land area.
| County | Share of this ZIP |
|---|---|
| Kimble County | 48.8% |
| Gillespie County | 44.3% |
| Kerr County | 6.9% |
Other place names in 78631
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 78631
| ZIP | City | Distance |
|---|---|---|
78618 | Doss, TX | 13.0 mi |
78025 | Ingram, TX | 18.1 mi |
76854 | London, TX | 19.9 mi |
78028 | Kerrville, TX | 22.6 mi |
78058 | Mountain Home, TX | 23.9 mi |
76856 | Mason, TX | 24.4 mi |
78024 | Hunt, TX | 26.1 mi |
78624 | Fredericksburg, TX | 26.2 mi |
78029 | Kerrville, TX | 31.2 mi |
76849 | Junction, TX | 32.0 mi |
Find every ZIP code within 10 miles of 78631 →
Questions about this ZIP code
Where is ZIP code 78631?
78631 is in Harper, Texas, in Kimble County. Its published point location is 30.3398, -99.3066.
What county is 78631 in?
78631 spans 3 counties: Kimble County, Gillespie County and Kerr County. Most of it falls in Kimble 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 78631?
Harper uses area code 830, from NANPA's telephone records.
What time zone is 78631 in?
78631 uses America/Chicago.
How many people live in 78631?
About 3,465 people live in ZIP code 78631, in 1,269 households, at 11.6 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 78631?
$78,560 a year, against $78,476 across Texas.
What ZIP codes are near 78631?
The closest are 78618 (13 mi), 78025 (18.1 mi), 76854 (19.9 mi), 78028 (22.6 mi) and 78058 (23.9 mi).
Is 78631 a PO Box ZIP code?
78631 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “78631 ZIP Code — Harper, Texas (Kimble County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/78631
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/78631.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.