40231
ZIP 40231 is in Louisville, Kentucky, in Jefferson County; area code 502; Eastern time. Louisville has 66 ZIP codes in all.
- Type
- Standard
- Time zone
- America/Kentucky/Louisville
- County
- Jefferson
- Metro area
- Louisville/Jefferson County, KY-IN
- Population
- 0
- Coordinates
- 38.1955, -85.6952
Weather right now
Asking the National Weather Service…
Where 40231 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 40231 into a pocket calculator and turn it upside down: IEZOh — not quite a word, sorry.
- ➕ 40231 is a prime number. It cannot be divided by anything except 1 and itself. Its digits add up to 10, a total 513 other ZIP codes share.
- 💾In binary, the way a computer stores it:
1001110100100111 - 🏠 Its numerical neighbours: 40229 (Louisville, KY, 8 mi away) and 40232 (Louisville, KY, 1 mi away).
- 🔄 Backwards, 40231 becomes 13204 — and that is a real ZIP code: Syracuse, NY, 601 miles away.
- 👥 68 other ZIP codes are made of exactly the same digits (01243, 01342, 01432, 02134, 02143, 02341, …). The farthest-flung twin is 34021 in APO AA, a military post office, 1,801 miles away.
- 🧭 Farther south than 57% of all ZIP codes, and farther east than 55%.
- 🎯700 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 40231 and you would come out at 38.20°S, 94.30°E — 1,289 miles from Perth, Australia, the nearest big city to that spot.
- ☀Longest day of the year: 14h 49m of daylight. Shortest: 9h 30m.
- 📏 At 0.067 square miles of land, 40231 is bigger than 1% of ZIP codes — about 32 football fields.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 0 |
|---|---|
| Households | 0 |
| Housing units | 0 |
| Population density | 0.0 / sq mi |
Land area
| Land area | 0.07 sq miThis ZIP0.07 sq mi |
|---|---|
| Water area | 0.00 sq mi |
Other place names in 40231
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 40231
| ZIP | City | Distance |
|---|---|---|
40201 | Louisville, KY | 1.1 mi |
40224 | Louisville, KY | 1.1 mi |
40225 | Louisville, KY | 1.1 mi |
40232 | Louisville, KY | 1.1 mi |
40233 | Louisville, KY | 1.1 mi |
40250 | Louisville, KY | 1.1 mi |
40251 | Louisville, KY | 1.1 mi |
40252 | Louisville, KY | 1.1 mi |
40253 | Louisville, KY | 1.1 mi |
40255 | Louisville, KY | 1.1 mi |
Find every ZIP code within 10 miles of 40231 →
Questions about this ZIP code
Where is ZIP code 40231?
40231 is in Louisville, Kentucky, in Jefferson County, part of the Louisville/Jefferson County, KY-IN metropolitan area. Its published point location is 38.1955, -85.6952.
What county is 40231 in?
40231 lies in Jefferson County.
What area code is 40231?
Louisville uses area code 502, from NANPA's telephone records.
What time zone is 40231 in?
40231 uses America/Kentucky/Louisville.
How many people live in 40231?
About 0 people live in ZIP code 40231. These are American Community Survey 5-year estimates for the ZIP Code Tabulation Area, not a headcount.
What ZIP codes are near 40231?
The closest are 40201 (1.1 mi), 40224 (1.1 mi), 40225 (1.1 mi), 40232 (1.1 mi) and 40233 (1.1 mi).
Is 40231 a PO Box ZIP code?
40231 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “40231 ZIP Code — Louisville, Kentucky (Jefferson County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/40231
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/40231.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.